198results about How to "Promote nitrification" patented technology

A wastewater treatment system includes a tidal, sequential vertical flow marsh cell system having at least three marsh cells in serial forward fluid communication. Incoming wastewater to be treated is channeled to at least the first and a second marsh cell, and a portion of water exiting a final marsh cell, to the first marsh cell surface. Each marsh cell is alternately flooded and drained for enhancing aeration of incoming water and marsh cell contents, which include media and plant roots having biofilms growing thereon, the biofilms including a population of nitrifying and denitrifying bacteria, for achieving substantially simultaneous nitrification and denitrification of the wastewater.

The present invention is drawn to a unique apparatus and method for treating and reusing the wastewater discharged from agricultural animal farms. The apparatus and method of the present invention may be readily sized and configured depending upon the amount and constituent(s) of the wastewater to be treated. In a first embodiment, the apparatus and method of the present invention is designed to be a zero discharge system in which no wastewater will be discharged or spray irrigated. In use, the apparatus and method of the first embodiment may actually require addition of make-up water during periods of low rainfall to make-up water losses due to evaporation and drift. It is contemplated that the only byproduct of the apparatus and method of the first embodiment may be a beneficial sludge if a sufficient number of installations are operated. In a second embodiment, the apparatus and method of the present invention provides a treatment system capable of reducing the nutrient loading in a step-wise fashion so that the wastewater can be used from different steps of treatment in order to apply the varying nutrient loads required by crops on a seasonal basis.

This invention relates to a combined vertical flow-vertical deflection wet land treatment technique for domestic wastewater. The technique comprises a pretreatment system and an artificial wet land system. The pretreatment system is mainly aim to removing the floating matters and precipitable suspended matters in domestic wastewater. The artificial wet land system is composed of combined vertical flow-vertical deflection in series. The invention has high removing rate on COD, N and P in domestic wastewater.

The invention provides a compound manual marsh system formed by the combination of surface flow and horizontal subsurface flow of a sunken plant type according to different oxygen dissolving environments and different oxygenizing effects of emergent aquatic plants, sunken plants, floating plants and other aquatic plants in the surface flow constructed wetland horizontal subsurface flow constructed wetland. Sunken plants are planted on a surface flow constructed wetland processing bed unit to increase the oxygen dissolving concentration of the unit and reinforce the nitrification of the unit, and the horizontal subsurface flow constructed wetland can easily form an anaerobic environment. The manual marsh environment of anaerobic and aerobic alternation can be formed by combining the two kinds of constructed wetlands together to be helpful for the step removal of nitrogen and phosphor.

The invention discloses a treatment method for biological nitrogen removal of reinforced sewage, which comprises the following steps of: 1, feeding all or partial treated sewage and sludge refluxed from a secondary sedimentation tank into a reflux sludge denitrification unit together by adopting division point inflow; 2, feeding the outflow of the reflux sludge denitrification unit and the residual sewage to an anaerobic unit or an anoxic unit; 3, feeding the outflow of the anaerobic unit to the anoxic unit, and refluxing the mixed solution of an aerobic unit to the anoxic unit; 4, feeding the outflow of the anoxic unit to a transition unit; 5, feeding the outflow of the transition unit to the aerobic unit, and refluxing the mixed solution of the aerobic unit to the anoxic unit from the outflow end of the aerobic unit; and 6, feeding the outflow of the aerobic unit to the secondary sedimentation tank to perform sludge-water separation. The method can be operated in multiple modes of A-A2O, nitrogen removal AO, inverse AAO and the like and has high controllability, and a system has strong nitrogen removal capability. The method is suitable for upgrade and reform of newly built sewage treatment plants of towns lacking the land and the conventional sewage treatment plants.

The invention discloses a low-oxygen aerating control device and method of segment inlet A / O biological denitrifying technique, which contains three control circuits, wherein the first and second circuits adopt DO cascade PI control system; the third circuit uses higher-precision ammonia nitrogen feedforward-feedback control system, which gathers DO density, ammonia nitrogen density of aerobic area and ammonia nitrogen density of last anoxybiotic area to reflect the change of inlet load.

The invention relates to a multi-mode constant-water-level sequencing batch active sludge sewage treatment method and system, belonging to the technical field of sewage treatment. The system comprises a sludge concentration pre-anoxic pond, an anaerobic pond, an anoxic pond, an aerobic pond, a facultative pond and a sequencing batch pond which are communicated, wherein the facultative pond runs in an aerobic or anoxic way. According to the system, multi-mode sewage treatment ways including an anaerobic-anoxic-aerobic mode, an anoxic-anaerobic-aerobic mode and an anaerobic-anoxic-aerobic-anoxic-aerobic mode can be performed. Due to the adoption of the sewage treatment method, the removing effects of nitrogen, phosphorus and organic matters can be enhanced, and equipment utilization ratio is increased.

The invention discloses an effluent treatment control system and on-line control method of A / O craft short distance nitrated and antinitrated, which is characterized by the following: the domestic sewage is used as dealing object at normal temperature; the DO sensor and pH sensor are installed in aerobic pool; the ORP sensor is set up in anoxic tank; the internal recycle sensor controls inner loop reflux quantity of system dynamically; the aeration quantity controls the aeration quantity of kinetic control system; the aeration quantity and inner loop reflux quantity are changed limberly according to water quality of inflow and water outlet; the level or nitration and anti-nitration are held accurately. The invention simplifies the craft, which reduces the cost.

The disclosed sewage treatment method to denitrify and recover phosphorus by a sludge external circulating composite membrane bioreactor comprises: attaching the bilmembrane on the filling; keeping the sewage in biormembrane zone for 3~5h; adjusting the micropore aerator to control the COD in biormembrane zone within 0. 5-1. 5mg / L for synchronous nitration and denitrification; letting the output water into the deposition zone with surface load as 1. 0m3 / m2. h through the rectification baffle on bottom; finally, guiding 35~45% deposited sludge in bioreactor into the dephosphorization pond. Compared with prior art, this invention saves 40~60% land, has low residual sludge, reduces cost about 20%, and outputs super water for direct usage.

The invention discloses an urban effluent disposing method through composite artificial wetland of integrated vertical flow and horizontal flow, which comprises the following steps: disposing effluent through vertical artificial wetland and horizontal artificial wetland then to fill blast-furnace / turf composite substrate and gravel / coal cinder compound substrate separately; dividing horizontal flow artificial wetland into front and back wetlands with interconnecting hole between two wetlands; building vertical flow artificial wetland on the former horizontal flow artificial wetland; making effluent dispose through vertical flow artificial wetland, former horizontal flow artificial wetland and the other horizontal flow artificial wetland from interconnecting hole.

The invention discloses a distributed domestic sewage treatment method. The method combines process units of anaerobic, jet oxygenation, biological oxidation, artificial wetland and the like together to perform anaerobic, aerobic and wetland ecological three-stage treatment on the domestic sewage so as to effectively reduce CODcr and BOD5 of the domestic sewage; and dephosphorization and denitrification are performed, and the effluent is stable and reaches the standards before emitting. A jet oxygenation pulse water distributor is adopted in the jet oxygenation, and the jet oxygenation pulse water distributor oxygenates the anaerobic effluent and provides pre-oxygenation treatment for a subsequent aerobic process; the biological oxidation is performed in a trickling filtration tower which is designed with 2 to 3 layers and provided with vent holes, a ceramic filler is placed in the trickling filtration tower, and the trickling filtration tower distributes water by adopting time control pulse so that the re-oxygenation effect of the trickling filtration tower can be improved and no power is consumed; and the artificial wetland is designed in an undercurrent form, proper fillers such as coal cinder, plaster, gravels and the like are placed in the artificial wetland, and pollutants can be further degraded and removed from the wetland environment. The method is suitable for standard-reaching treatment of rural or urban distributed domestic sewage.

The invention relates to a combinational processing technique of deck radial flow, comprising the following steps: firstly, performing oil removal and sedimentation processing on the collected deck radial flow, then, introducing the processed radial flow to a planting slope, and introducing the radial flow to an artificial wet land for biochemical treatment. The processing device comprises an oil removing tank, a sedimentation tank and the artificial wet land, wherein a water outlet of the oil removing tank is connected with a water inlet of the sedimentation tank; the planting slope is arranged between the sedimentation tank and the artificial wet land; the water outlet of the sedimentation tank is higher than the slope top of the planting slope; and the bottom of the planting slope is opposite to the water inlet of the artificial wet land so that the radial flow flowing down from the planting slope enters from the water inlet of the artificial wet land to the artificial wet land through the bottom of the planting slope. The invention can improve the efficiency of processing the pollution of deck radial flow.

The invention relates to a system and a method for removing phosphorus by three-mud process nitrification and denitrification. The system comprises a pretreating unit, an anaerobic unit, a middle precipitation unit, a primary aeration biological nitrification unit, an anoxic unit, a secondary precipitation unit and a secondary aeration biological nitrification unit. The method comprises the following steps that: after being precipitated in the pretreating unit for removing oil, the primary water enters an anaerobic pool with returned sludge to anaerobicly release the phosphorus; microorganisms absorb polyhydroxyrate (PHB) in a dissoluble organic compound body in the water; after muddy water is precipitated in a middle precipitation pool, a supernatant enters the primary aeration biological nitrification unit and an effluent and sludge in the middle precipitation pool enter an anaerobic pool to undergo denitrification and dephosphorization; and after mixed solution in the anaerobic pool is separated in a secondary precipitation pool, the supernatant enters the secondary aeration biological nitrification unit for further treatment, wherein one part of the sludge is reclaimed and theother parts of the sludge are discharged as remaining sludge. The system of the invention is small in occupied area and low in basic construction and operation costs. For low-carbon and nitrogen urban sewage, the effluent of the system can stably meet the first grade A standards of Urban Sewage Disposal Plant Contamination Integrated Discharge Standard.

The invention discloses an activated sludge treatment method for wastewater. The method comprises the following steps that 1, under the anoxic treatment condition, the wastewater makes contact with a material containing activated sludge, and anoxic treatment on the wastewater is performed; 2, aerobiotic treatment is performed on a mixture obtained after the contact; 3, part of a mixed material obtained through aerobiotic treatment is returned to the step 1 to serve as part of the material containing the activated sludge, wherein the particle size of at least 60 wt% of the activated sludge in the mixed material which is obtained through aerobiotic treatment and returned to the step 1 is not larger than 1 mm. The invention further provides an activated sludge treatment system for the wastewater. According to the activated sludge treatment method and system for the wastewater, the degradation and nitrification efficiency of organic matter difficult to degrade in the wastewater is promoted, and agentia feeding and O pool aeration strengthening are not needed; the advantages of being low in operation cost and free of by-products are achieved.

The invention provides a new process for micro electric field reinforced low-carbon nitrogen removal, which is particularly suitable for treating waste water with high ammonia nitrogen content and high organic substance content. The process comprises anaerobic fermentation reaction and autotrophic synchronous nitrification-denitrification reaction, wherein after the waste water to be treated enters an anaerobic fermentation reactor and is subjected to anaerobic fermentation reaction treatment, most of organic substances are converted into methane through anaerobic fermentation to perform energy recycle and avoid directly converting the organic substances into CO2 to be discharged. The waste water after the anaerobic treatment has few organic substances and then enters a complex three-dimensional electrode-biological membrane reactor. The process realizes autotrophic synchronous nitrification-denitrification by domesticating carbon autotrophic nitrifying bacteria and hydrogen autotrophic denitrifying bacteria attached to particle electrodes in the complex three-dimensional electrode-biological membrane reactor, finally fulfills the nitrogen removal purpose of directly converting the ammonia nitrogen into the nitrogen, does not need to add the organic substances, basically has no CO2 emission, and is a controllable, efficient, low-consumption, 'low-carbon emission' and environment-friendly new process.

The invention provides a wastewater treatment technology beneficial to removing black and odorous water.The technology sequentially comprises the following steps of collecting basin treatment, coagulation and air floatation treatment, bio-contact oxidation treatment and constructed wetland treatment.The technology is easy to operate and good in water drainage effect, and produces no odor in the treatment process.The invention further provides a wastewater treatment device beneficial to removing black and odorous water.The device sequentially comprises a collecting basin, a coagulation and air floatation basin, a bio-contact oxidation treatment basin and a constructed wetland treatment system.The device is simple in structure, convenient to maintain and good in wastewater treatment effect.

An efficient system and process for removing nitrogen from wastewater while enriching seed sludge in the mainstream treatment process. Bioaugmentation of seed autotrophic organisms facilitate the nitrification reactions by enhancing the rates of reaction advantageously within a smaller volume or within a shorter activated sludge solids retention time. Likewise, bioaugmentation of seed denitrification organisms will also enhance rate of reaction within a smaller volume or shorter activated sludge solids retention time. Separate treatment of high ammonia digester reject water is an efficient method to treat nitrogen in recycle streams as well as to enrich the seed nitrifying and denitrifying cultures.

The invention discloses an enhanced nitrogen and phosphorus removal combined type artificial subsurface-flow wetland treatment system. The system comprises a sedimentation pool with a screen cloth, a front catchment buffer pool, a vertical flow artificial wetland, an advection artificial wetland system and a rear catchment buffer pool; algae and suspension pollutants in sewage are removed through the screen cloth, then, primary sedimentation of the sewage is completed inside the sedimentation pool, the sewage enters the front catchment buffer pool through an overflow weir, and then the sewage enters the vertical flow artificial wetland system through a water inlet, sufficient oxygen is provided for the vertical flow artificial wetland system through a micro-aeration device, then, the sewage enters the advection artificial wetland system after the adsorption effect of microorganisms, plants and matrixes, and the sewage is discharged into the rear catchment buffer pool after being treated by the advection artificial wetland system, and discharged out of the system through a water outlet pipe. According to the enhanced nitrogen and phosphorus removal combined type artificial subsurface-flow wetland treatment system, the nitrogen and phosphorus removal effect can be enhanced, and suspended particles, organic pollutants, heavy metal ions and other contaminants in sewage can be effectively removed.

The invention discloses a CDI (Capacitive Deionization) based compound type constructed wetland desalination system. The technical scheme of the invention is that a pretreatment system in the compounded type constructed wetland desalination system is connected with a compound vertical flow constructed wetland system by virtue of a pipeline. The pretreatment system is that: the water inlet and the water outlet of a grille (22) are communicated with the water inlet of a corresponding first pressure pump (23) and the water inlet of a CDI device (3) by virtue of pipelines, andthe water outlet of the CDI device (3) is communicated with the water inlet of a compound vertical flow constructed wetland and the water inlet of a salt drying plate (9) respectively through pipelines.A bottom impervious layer (18) of the compound vertical flow constructed wetland system is sequentially provided with a gravel layer (17), a biological ceramisite layer (13), a zeolite layer (12) and a soil layer (11) upwards, the constructedwetland is uniformly separated into 2n+1 vertical flow treatment tanks (7)along the left and right direction, and the tops and the bottoms of the vertical flow treatment tanksare communicated with one another in a staggered manner. The CDI based compound type constructed wetland desalination system disclosed by the invention is environmentallyfriendly, can effectively solve the problem of clogging and saturation of the soil layer of the wetland, and is good in nitrogen and phosphorus removal effect and desalination effect.

Provided is a method for manufacturing geological gradation layer featuring disaster prevention and ecologic function, which uses on-site earth or gradation materials commonly adopted in road construction, including aggregates, soils, gravels, or a mixture of water permeable concrete, and most importantly, added with uniquely arranged hollow bodies, all constituents being mixed and laid on soil stratum, and subjected to ramming, to form an ecological gradation layer. The ecological gradation layer provides an effect of supporting and also provides the functions of water storage, water preservation, and improving earth, whereby earth microorganisms and earth protozoa may establish a beneficial survival environment in earth, making the gradation layer exhibiting the characteristics of high water content and prompting breeding of microorganisms. When the atmosphere gets hot, water is released from the soil as vapor to alleviate the heat island effect and when rainwater precipitates, the rainwater can be stored for use in draughts.

Processes and apparatus are provided for the nitrification and denitrification of digested biosolids. The rate of nitrification / denitrification is controlled by sensing the amount of oxygen or another parameter in the digested biosolids and adjusting the amount of oxygen supplied to the biosolids, such as through automated adjustment of an aeration device. To promote nitrification, the amount of oxygen available in the digested biosolids is increased. To promote denitrification, the amount of oxygen available in the digested biosolids is decreased. The processes and apparatus are well suited for reducing the concentration of ammonium in biosolids or off-gas resulting from aerobic thermophilic digestion of wastewater sludges. The processes and apparatus are well suited for reducing the dosage of chemicals required for dewatering operations of biosolids.

The invention discloses a method for quickly starting a shortcut nitrification reactor. The method comprises the following steps: after performing inoculation on the reactor, firstly performing overaeration, and applying an aeration impact so as to accelerate the elimination of anaerobic bacteria in sludge; quickly enriching nitrifying bacteria, and then applying a combined load impact comprising a substrate concentration impact and a hydraulic retention time impact so as to quickly restrain and eliminate nitrite oxidizing bacteria; finally, under the condition that an appropriate substrate concentration and an appropriate hydraulic retention time are maintained, increasing the concentration of an inorganic carbon source so as to enrich ammonia oxidizing bacteria and accelerate the accumulation of nitrite. According to the invention, the various continuous impacts are combined, the enrichment of the ammonia oxidizing bacteria in the sludge is accelerated within a shorter time, and the quick start of the shortcut nitrification reactor is realized.

The invention discloses a method for improving ammonia nitrogen removal in a constructed wetland by utilizing a wetland harvesting plant. The constructed wetland comprises a pool body, a water inlet / outlet system, a wetland matrix and a wetland plant; the wetland plant is harvested and then carbonized to obtain a biomass carbon material of such a wetland plant, and then the biomass carbon material is backfilled into the pool body as the wetland matrix; the wetland matrix comprises a bottom layer, an intermediate layer and a surface layer which are placed from bottom to top in sequence; and the intermediate layer is the biomass carbon material. By adopting the method, the effect of removing NH4<+>-H in sewage is improved, no secondary pollution is brought, and the cost on construction and operation of the conventional constructed wetland can be effectively reduced; and the method has the characteristics of being stabile in water treatment effect and capable of buffering the impact to hydraulic power and pollution load. The method not only solves the problem that improper treatment is performed to the harvested wetland plant and causes secondary pollution to the environment, but also effectively improves the removal effect of the wetland to the NH4<+>-H, and realizes the recycle of the wetland plant.

The invention provides oxygen-increasing type solid stabilized chlorine dioxide, and a preparation method and application thereof. The raw materials of the oxygen-increasing type solid stabilized chlorine dioxide comprise 15 to 40 percent of chlorite, 20 to 34 percent of solid protonic acid, 5 to 30 percent of peroxide and 30 to 50 percent of protective agent. The preparation method comprises the following steps: throwing the protective agent into blending equipment and adding the solid protonic acid; after mixing the materials for 15 to 25 minutes, sequentially adding the peroxide and the chlorite and blending for 25 minutes; and after weighing the blended materials, directly sealing and packaging or directly pressing the materials in die-pressing equipment into tablets, granules, columns or balls and packaging to obtain the oxygen-increasing type solid stabilized chlorine dioxide product. The chlorine dioxide prepared by the method can serve as disinfectant, also can serve as an oxygen-increasing agent, is suitable for disinfection, oxygen increment, disease prevention and disease resistance for aquaculture, and can improve the water quality, promote the nitrification, reduce the ammonia nitrogen content of water area, improve the substrate of a pond and eliminate hydrogen sulfide.

The invention relates to a method for performing nitrogen biological removal on low-temperature low-carbon nitrogen ratio sewage. A device with anoxia ponds and aerobic ponds which are distributed alternatively, arrayed continuously and are communicated with one another, sewage raw water respectively flows into each anoxia pond, outlet water of the tail end aerobic ponds respectively flows back to each anoxia ponds, and biological membrane modules are arranged in each aerobic pond to maintain biomass of activated sludge. Compared with the prior art, the nitration efficiency in the aerobic section is effectively improved by the method through optimizing the raw water to inlet water ratio and equinox backflow ratio in second-stage anoxia-aerobic process, the biomass of activated sludge is maintained by using the biological membrane modules, on one hand, the outlet water quality is improved under normal work conditions, and on the other hand, high-efficient nitration under low-temperature condition is realized. The COD value, the ammonia nitrogen content and total nitrogen level of the outlet water are lower in average, and the first level A standard can be reached under a low-temperature low- carbon nitrogen ratio condition.

The invention discloses a device and a method for processing C / N urban household wastewater by an A2O-BAF (Biological Aerated Filter) process. The device comprises a water inlet tank, an A2O reactor, a secondary sedimentation tank, an intermediate water tank, a BAF reactor and a water outlet tank connected in sequence. Raw water and return sludge are pumped from the water inlet tank to an anaerobic zone; mixed liquor in the anaerobic zone and nitration liquor enter in the anaerobic zone; the mixed liquor in the anaerobic zone then enters in an aerobic zone; mixed liquor from the A2O enters in the intermediate water tank; supernate is pumped from the intermediate water tank to the BAF; sludge in the secondary sedimentation tank reflows to the anaerobic zone; the separated supernate enters in the BAF in which effluents water enters in the water outlet tank; and part of water in the water outlet tank reflows to an anoxic zone and the other part is discharged. The invention reduces the aeration amount, saves carbon sources, effectively improves the nitration and prolongs the backwashing time of the BAF.

An efficient system and process for removing nitrogen from wastewater while enriching seed sludge in the mainstream treatment process. Bioaugmentation of seed autotrophic organisms facilitate the nitrification reactions by enhancing the rates of reaction advantageously within a smaller volume or within a shorter activated sludge solids retention time. Likewise, bioaugmentation of seed denitrification organisms will also enhance rate of reaction within a smaller volume or shorter activated sludge solids retention time. Separate treatment of high ammonia digester reject water is an efficient method to treat nitrogen in recycle streams as well as to enrich the seed nitrifying and denitrifying cultures.

The invention relates to a fertilizer synergist, and in particular relates to a poly(polyphenol) coated nitrification inhibitor as well as a preparation method and application thereof. The poly(polyphenol) coated nitrification inhibitor comprises a nitrification inhibitor and poly(polyphenol) coating the nitrification inhibitor. The preparation method is that a polyphenol compound is subjected toa polymerization reaction on the surface of the nitrification inhibitor. The poly(polyphenol) coating material is resistant to water washing, has good pH responsiveness, is biodegradable, and has lessinfluence on the denitrification effect of the nitrification inhibitor. The coated structure enables the nitrification inhibitor to be resistant to water washing and deliquescence, and have a bettereffect on inhibition of the nitrification effect of nitrogen fertilizers. In addition, the coated structure enables the slow release effect of the nitrification inhibitor to be obvious.

The invention relates to the technical field of disinfectants, in particular to a disinfecting and oxygenating agent for aquaculture. The disinfecting oxygenating agent comprises the following components: zeolite powder, activated carbon, a purifying agent, an oxygen producer, a beneficial bacteria mixture, polyacrylamide, an inorganic flocculant, dextrin, sodium chlorite, sodium hydrogencarbonate, L-ascorbic acid and protease, wherein the purifying agent is a non-toxic heavy metal adsorbent; the oxygen producer is coated slow-release sodium percarbonate or coated slow-release calcium peroxide; the beneficial bacteria mixture contains strains of bacillus megaterium, photosynthetic bacteria and EM bacteria; the inorganic flocculant is a high-efficiency flocculant formed by compounding polyaluminum ferric chloride and ferric oxide. The disinfecting and oxygenating agent is safe and healthy, can continuously increase oxygen in a water body, and has the functions of disinfecting and adsorbing heavy metal elements.