90 results about "Trihalomethane" patented technology

In addition to health implications, trihalomethanes (THMs) poses a challenge to the electronic industry where such impurities cannot be tolerated. A process is provided for removing THMs from high-purity water used in the electronic industry. The method of the invention comprises contacting the high-purity water with a membrane degassifier, preferably operating at a temperature exceeding 45° C.

A portable analytical system for detecting organic chemicals in water comprising a miniature preconcentrator and a SAW detector, the latter being characterized by a nanoporous carbon coating that provides improved response compared to prior art polymer coatings, particularly when detecting low concentrations of trihalomethane chemicals, such as chloroform and bromoform.

A removing agent for heavy metal ion in water which comprises synthetic zeolite, wherein 10 mol % or more of a total amount of exchangeable cation is substituted with magnesium ion and 60 mol % or more thereof is substituted with magnesium ion and calcium ion, and activated carbon at a weight ratio of 2:98 to 50:50 can effectively adsorb and remove heavy metal ions such as lead in water as well as residual chlorine and trihalomethane efficiently, particularly, in tap water, so as to allow delicious and healthful water without disturbing the balance between calcium ion and magnesium ion.

The invention discloses a method for synchronously determining the content of trihalomethane and haloacetic acid in drinking water, relates to a method for determining the content of trihalomethane and haloacetic acid in the drinking water, and aims at solving the problems that in the prior art, synchronous pretreatment cannot be performed on trihalomethane and haloacetic acid in the drinking water, and time and labor are consumed and the cost is high when trihalomethane and haloacetic acid in the drinking water are synchronously determined and separately determined. The method comprises the steps that 1, a water sample to be determined is acidized; 2, the polarity of the water sample to be determined is enhanced; 3, extracting is performed; 4, deriving is performed; 5, neutralizing is performed; 6, the peak area of trihalomethane in the water sample to be determined is determined; 7, the peak area of haloacetic acid in the water sample to be determined is determined; 8, a standard curve is drawn; 9, the concentration of trihalomethane in the water sample to be determined is calculated; 10, the concentration of haloacetic acid in the water sample to be determined is calculated. The method for synchronously determining the content of trihalomethane and haloacetic acid in the drinking water can be achieved.

The invention provides a method for removing algae by using inorganic solid peroxide for inducing peroxymonosulfate to generate singlet oxygen and relates to an algae removal method. The algae removal method is used for solving the problems that poisonous byproducts such as trihalomethane are easily generated in a prechlorination algae removal process, chlorine is inconvenient to transport and store, the potential safety hazards exist, and an ozone preoxidation algae removal method needs additional equipment and is high in investment and operating cost and complicated in operation. The algae removal method comprises the following steps: adding the inorganic solid peroxide and the peroxymonosulfate to algae-containing water, stirring, sequentially coagulating, precipitating, filtering and sterilizing so as to complete the algae removal. According to the algae removal method, the generated high-activity singlet oxygen rapidly acts on the algae, kills algae cells and inactivates the algae, so that the purpose of removing algae is reached. As solid reagents, the inorganic solid peroxide and the peroxymonosulfate can be directly added for use without need of additional equipment. The reverse osmosis concentrated solution treatment method has the advantages that the operation is simple and practicable, the reagents are convenient to transport and store, low in cost and easy to obtain, no poisonous and harmful byproducts are generated in the algae removal process, and the reagents can be used on a large scale in water plants.

The invention relates to a method for controlling the formation quantity of bromate in an ozone oxidation process of drinking water by introducing a nano TiO2 catalyst, which avoids negative effects brought to the safety and the reliability of the drinking water of the traditional method for controlling the bromate by adding chemical drugs. According to the method, settled water treated by a conventional method is directly filled into a nano TiO2 catalyst bed for ozone contact and catalytic ozone oxidation, or after the settled water is subjected to ozone contact and catalytic ozone oxidation in a primary nano TiO2 catalyst bed, water still containing ozone is filled into a secondary nano TiO2 catalyst bed for carrying out a catalytic reaction, wherein the contact oxidation time is 10-20min. The method has the advantages that the nano TiO2 has obvious efficiency of reducing the formation quantity of the bromate in the ozone oxidation process and also has obvious control efficiency to the formation quantity of the bromate in the ozone oxidation process of water with high bromide ion concentration, the formation potential to trihalomethane and the reduction efficiency to DOC of individual ozone oxidation can be improved, and other toxic and side effects cannot be caused to the quality of the drinking water.

A removing agent for heavy metal ion in water which comprises synthetic zeolite, wherein 10 mol % or more of a total amount of exchangeable cation is substituted with magnesium ion and 60 mol % or more thereof is substituted with magnesium ion and calcium ion, and activated carbon at a weight ratio of 2:98 to 50:50 can effectively adsorb and remove heavy metal ions such as lead in water as well as residual chlorine and trihalomethane efficiently, particularly, in tap water, so as to allow delicious and healthful water without disturbing the balance between calcium ion and magnesium ion.

The invention relates to a method for controlling the formation of iodotrihalomethanes in drinking water, comprising the following steps: (1) adjusting the pH value of the water to be treated to pH≤9, then adding potassium ferrate to the water to be treated, stirring Make it mix and react; (2) the solution after the reaction is filtered by natural sedimentation and microfiltration membrane to obtain iodine-free water; (3) add disinfectant to the iodine-free water gained in step (2) for disinfection , that is, drinking water. Compared with the prior art, the present invention controls the generation risk of I-THMs in drinking water without complicated and lengthy operation process, and can avoid the formation of I-THMs at acidic and neutral pH, and can be used respectively at pH=9. The I‑THMs produced by subsequent chlorination / chloramination were reduced by 94.5% and 84.1%, which can effectively reduce the carcinogenic risk of by-products caused by the use of chlorine and chloramine disinfection.

The present invention relates to a portable apparatus for producing hydrogen water for removing various microorganisms, including water-borne infectious bacteria, by purifying natural water, tap water, or underground water or by direct electrolysis, and for removing residual chlorine, hypochlorite ions, and total trihalomethane by dissolving chlorine ions, etc. in raw water by means of electrolysis. According to the apparatus, the difficulty of obtaining uniform conductivity caused by a scale coated layer on the surface of an electrode plate or a rod while performing conventional electrolysis can be solved. In addition, water including abundant dissolved hydrogen can be obtained.

The invention discloses an ammonia nitrogen removing agent and belongs to the field of environmental protection. Zeolite is modified and activated by hydrochloric acid, magnesium chloride and sodium chloride are dispersed on the zeolite by an ultrasonic treatment and roasting method, the specific surface area of the zeolite is increased, an alkaline active site is obtained, the microporous structure of the zeolite is remained, the original calcium ions with larger radiuses in the zeolite are replaced by the magnesium ions and the sodium ions, the effective pore diameter of the zeolite is enlarged, the internal dispersing speed is increased and the exchange capacity is increased, so that the adsorption ability on ammonia nitrogen in waste water is improved and the ammonia nitrogen removingagent is suitable for ammonia nitrogen containing waste water with high concentration and low concentration. The problem that trihalomethane is generated caused by the fact that excessive chlorine isadded in the existing domestic water preparation process is solved.

Water bottle coupled with a filtration cartridge including a plastic reservoir sufficiently flexible so that it can be gripped and squeezed, a drinking cap removably attached to the reservoir, a replaceable filtering element removably coupled with the drinking spout portion of the cap through which water inside the reservoir passes before being released through the spout. The removable filter includes and entry and an exit layer of felt and a layer of activated charcoal mixed with zeolite to reduce chlorine, trihalomethanes, organochlorines and heavy metals. The reservoir can fits into a magnetized base which can also be embedded in the body of the reservoir, and a cover to cover the cap and spout which dispenses purified water to the consumer.

The system and method reduces volatile organic compound concentration in a water distribution system using pressurized diffused aeration. The system and method is used in-line in a water distribution system. The system and method can be used at the ends of the distribution system where volatile organic compounds, including trihalomethanes, are more likely to persist. The system and method of pressurized, diffused aeration reduces volatile organic compounds from groundwater remediation systems as well.

In addition to health implications, trihalomethanes (THMs) poses a challenge to the electronic industry where such impurities cannot be tolerated. A process is provided for removing THMs from high-purity water used in the electronic industry. The method of the invention comprises contacting the high-purity water with a membrane degassifier, preferably operating at a temperature exceeding 45° C.

Provided is a preparation method for 17a-hydroxyprogesterone or analogs thereof, comprising the following steps: the compound as represented in formula (4) reacts in solvent and trihalomethane in the presence of magnesium metal and lithium halide; hydrolysis is carried out using acidic substance; the target product (1) is collected from the reaction product. The present invention lowers production cost and prevents problems such as environment polluting byproducts and highly toxic, unstable reagents and intermediate products. The reaction conditions are moderate, and the purity after simple purifications can exceed 99%. The present invention is easy to implement in industry. The reaction formula is as (4), (1).

Clogging of membrane by slime adhesion is efficiently prevented and stable treatment can be carried out for a long period of time at a low cost by a small amount of chemicals without the membrane deterioration and trihalomethane formation even if applied to the water having a large number of viable cell counts and having water quality of harsh. The method comprises supplying water to be treated to a membrane separation apparatus 4, adding intermittently to the water to be treated a combined chlorine agent comprising sulfamic compound, and repeating a non-addition feeding period in which water to be treated is supplied for 6-120 hours without addition of combined chlorine agent, and an intermittent addition feeding period in which water to be treated is supplied for 0.5-40 hours under addition of a combined chlorine agent at biofilm exfoliating concentration in an early stage of biofilm formation during the non-addition feeding period, wherein viable cell count (log CFU / mL) of water to be treated is 3 or more, and the concentration of the combined chlorine agent in the water in the intermittent addition feeding period is 0.5-20 mg / L as total chlorine, and additive amount of the combined chlorine agent added in the intermittent addition feeding period is the amount in which R represented by the following Formula [4] is 3 or more.R=(Intermittent addition feeding period (h)×[1000×Intermittent addition concentration (mg-Cl / L)]2.5 / (Non-addition feeding period (h)3.0×10log CFU / mL)  [4]

This Adaptive Catalytic Technology (ACT) water treatment invention uses a series of integrated sequential modular advanced technologies to treat and eliminate or reduce suspended solids, hardness, heavy metals, organic compounds and microorganisms and to provide good tasting chlorine-free sanitized drinking water. The advanced technologies used herein are specifically designed to provide synergistic benefits that minimizes power consumption while improving the overall treatment effectiveness, making it possible to provide a cost effective and sustainable ACT water treatment for point of use drinking water supply for remote or developing areas, as well as residential, commercial, and industrial applications. The advanced technologies employed are environmentally friendly and safe. Specifically, the ACT water treatment invention does not require hazardous chemicals that need special handling to operate or maintain and it does not produce a waste stream or generates disinfection by-products (DBPs), such as, trihalomethanes (THMs) or haloacetic acids (HAAs).

A water treating and disinfecting process for water works includes such steps as adding chlorine in water for disinfecting water by free cl ions for ions for 5-30 min, and adding ammonia to convert said free cl ions to chloroamine for disinfecting water further.

The invention relates to a water treatment method using catalysis of ozone and provides a water treatment method capable of controlling iodination disinfection by-products by catalyzing ozone oxidation of hardly-degradable iodinated organic matters via persulfate. The objective of the invention is to overcome the common problem of high iodination by-product content of chlorine and chloramine disinfection due to poor removal effect on hardly-degradable iodinated organic matters in a variety of water bodies in the prior art. The water treatment method capable of controlling the iodination disinfection by-products comprises the following steps: introducing ozone into an ozone contact reactor, adding a persulfate catalyst under stirring conditions and carrying out a stirring reaction so as to obtain a treated water body. The method provided by the invention employs a green catalyst, i.e., persulfate, so secondary pollution is not posed to the environment; and persulfate is used for catalyzing ozone for generation of free radicals, so the removal rate of organic iodine is substantially increased, organic iodine is converted into inorganic iodide ions, and obvious inhibition effect is exerted on iodination by-products, wherein the generation rates of iodo-trihalomethane and total iodine can be reduced by 60 to 80% and 40 to 70%, respectively.

The invention provides an apparatus for preparation of hypochlorous acid water. The apparatus includes: a water inlet device; a mixer with a first inlet connected to the outlet of the water inlet device; an electrolytic device with a chlorine gas outlet connected to a second inlet of the mixer; an electrolyte solution sampling device with an outlet connected to the electrolytic device inlet; and a control system for controlling the electrolytic device, the water inlet device and the electrolyte solution sampling device. The hypochlorous acid water preparation apparatus provided by the invention includes the control system, which controls the electrolytic device, the water inlet device and the electrolyte solution sampling device, by controlling the electric current of the electrolytic device, the water inflow of the water inlet device and the electrolyte solution transport flow of the electrolyte solution sampling device, the obtained hypochlorous acid water has a low content of available chlorine. The hypochlorous acid water prepared by the apparatus provided by the invention does not have excessive free chlorine, and cannot form trihalomethane with organic matters in the environment. Therefore, the hypochlorous acid water is safe and harmless to serve as a disinfectant.

A method of and system for treating water to reduce the level of trihalomethanes includes the water to be treated (WTBT) being sprayed through a nozzle to aerate the WTBT to increase the air / water interface therein reducing the level of trihalomethanes in the water. In one embodiment, the pressure of the WTBT in the nozzle is adjusted and the nozzle is selected to have a nozzle orifice such that the droplet size of the water to be treated from the nozzle is less than 150 microns SMD. In addition, the nozzle is spaced from a holding tank for receiving and collecting the sprayed water such that the surface of the treated water is a minimum of four meters from the nozzle.

The invention discloses an infrared ceramic kettle with an absorbing function and process for producing the same. The process comprises the following steps of: mixing bamboo charcoal powder or biological ceramic power and clay, adding water, uniformly stirring the mixed solution, and performing vacuum de-airing by using a vacuum de-airing machine to obtain blanks; removing iron-containing components from bamboo charcoal powder and clay in the blanks, making a mold according to the shape and the size of the kettle and the shrinkage ratio of bamboo charcoal ceramics after burning, putting the aged blanks in the mold, pressing the blanks by using a punch to obtain a semi-finished product, grinding the outer surface of the semi-finished product, blocking pores on the outer surface of the semi-finished product, and sintering the semi-finished product at high temperature; and finally, putting the semi-finished product in a coaming, filling the coaming with the bamboo charcoal powder and sealing, and sintering the semi-finished product at high temperature. The infrared ceramic kettle has the advantages of removing excessive chlorine and trihalomethane from tap water, removing pesticide residue which is harmful to human body and heavy metal pollutants such as lead, cadmium and mercury, and making acidic water be weakly alkaline. Anyway, the infrared ceramic kettle has eight biggest advantages of 1, adsorption; 2, release of anions; 3, release of far infrared rays; 4, release of microelements; 5, control of breeding of microorganisms; 6, expelling of worms and sterilization; 7, oxidation resistance and 8, electrostatic shielding and electromagnetic radiation resistance.

A method of and system for treating water to reduce the level of trihalomethanes or other volatile contaminants such as radon includes the water to be treated (WTBT) being sprayed through a nozzle to aerate the WTBT to increase the air / water interface therein reducing the level of trihalomethanes in the water. In one embodiment, the pressure of the WTBT in the nozzle is adjusted and the nozzle is selected to have a nozzle orifice such that the droplet size of the water to be treated from the nozzle is less than 2000 microns SMD. In addition, the nozzle is spaced from a holding tank for receiving and collecting the sprayed water such that the surface of the treated water is specified at a particular distance based on desired treatment goals.

The invention discloses a magnetic metal-organic nanometer core-shell material with an adjustable diameter and a preparation method thereof. The method comprises the following steps: adding 4,4'-bipyridine into an AgNO3 solution, carrying out uniform mixing under stirring, then adding 1,2,3-benzenetricarboxylic acid, adding KOH to adjust a pH value, carrying out a reaction at 140 DEG C to 170 DEGC so as to obtain an Ag-based metal-organic nanotube material, adding Fe3O4 with a surface modified by silane and the Ag-based metal-organic nanotube material into water, carrying out uniform ultrasonic dispersion, and adding 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride and 4-dimethylaminopyridine so as to prepare the magnetic metal-organic nanometer core-shell material. According tothe invention, through adjustment of the pH value, adjustment and control of the diameter and specific surface area of the material are achieved, and a maximum specific surface area can reach 177.42 m<2> / g; the contact area between an adsorbent and a trihalomethane pollutant is significantly improved; the effect of adsorption is effectively improved; the removal efficiency of adsorption reaches 90% or more; and the adsorbent can be recycled.

Method and apparatus for treating potable water in municipal and similar tanks to reduce and remove undesirable disinfectant byproducts such as trihalomethanes from the water by providing a water circulation system to create circulation patterns in the tank water and an air flow system for creating an air flow pattern in the headspace region of the enclosed tank above the water surface. In operation, a portion of the tank water is drawn-up a draft tube from the tank floor to above the water surface and sprayed through a nozzle outwardly about a vertical axis and slightly downwardly toward the surface of remaining tank water. The air flow system creates and directs a high volume of air through the tank above the water surface to volatize undesirable trihalomethanes in the drawn-up water portion to gaseous state to enter the air flow pattern and exit the tank into ambient air.

The invention discloses a method for detecting volatile disinfection by-products including trihalomethane and trichloronitromethane in drinking water or sewage by a solid phase microextraction-gas chromatography-mass spectrometry technique. A metal organic framework material MIL-96 is used as a coating material of a solid-phase microextraction probe for the first time and applied to pretreatment of the volatile disinfection by-products to establish a complete novel trihalomethane and trichloronitromethane analytic detection method along with gas chromatography-mass spectrometry. The MIL-96 coating material is high in adsorption capacity and heat resistance and higher than commercial coatings in extraction power and enables recycling of aged probes. The method is 0.02-50microgram / L in linear detection range, 0.0030-0.0110microgram / L in detection limit and 81.0%-109.9% in standard recovery rate, has advantages of high sensitivity, simplicity, quickness, high repeatability and the like and is suitable for popularization and application.

The invention relates to a method and a device for removing trihalomethanes in drinking water by plasma, in particular to water treatment. The device comprises a reactor, a gas discharge tube, a gas circulating pump, an alkaline tank, electrodes, and a high frequency power supply. After water is introduced into the reactor, oxygen and argon are introduced; the gas circulating pump is started, and gas flow speed is regulated; the high frequency power supply is started, gaseous discharge is performed in the gas discharge tube to treat incoming gas, outgoing gas is automatically introduced into the alkaline tank during discharging, hydrogen halide and carbon dioxide are absorbed, residual gas returns to a reaction container, and trihalomethanes in the water are stripped continuously and are introduced into the discharge tube for degradation; when the content of the oxygen in the discharge tube, calculated by percentage, is lower than 0.05%, the oxygen is supplemented to 0.1-10% through a steel oxygen cylinder; When the concentration of alkaline in the alkaline tank is lower than 0.05mol / L, the alkaline is supplemented to 0.1-5mol / L.

The invention provides a water preparation technology of metasilicic acid-enriched low-scale mineral water, and belongs to the technical field of drinking water purification. A technical process comprises thefollowing steps: raw water selection, deep well water taking, rough filtering, safety filtration, nanofiltration, UHT (Ultra High Treated) heating, cooling, fine filtration, UV (Ultraviolet) sterilization, terminal filtration and low-scale mineral water product obtaining, wherein raw water is selected from natural drinking mineral water which is rich in metasilicic acid. According to the water preparation technology provided by the invention, produced water is the metasilicic acid-enriched low-scale mineral water and is suitable for long-time drinking, and the nutrition is better thanthat of existing purified water and other drinking water; the produced water is subjected to fine filtration for removing scales after being subjected to the nanofiltration and the UHT heating, the scaling coefficient is extremely low, the taste and the appearance are improved, the metasilicic acid-enriched low-scale mineral water is more suitable for cooking tea and cooking porridge, and the metasilicic acid-enriched low-scale mineral water is clear and bright in water quality and is eyeable; the produced water is subjected to UHT high-temperature sterilization and then is subjected to medium-pressure UV sterilization and the terminal filtration sterilization, the sterilization modes are all physical sterilization, harmful matters such as bromateor trihalomethane cannot exist in the water, and the quality is safer; the produced water can be encapsulated into packaged drinking water and can also be used as direct drinking water which is piped into homes, and the adaptation of the product is stronger.

The invention discloses a chlorine-free swimming pool system and a full flow and full process ozone disinfection method. The system comprises a swimming pool and a disinfection system; a raw water pipe of the disinfection system is communicated with a overflow gutter of the at the upper part of the swimming pool; a water inlet pipe of the disinfection system is communicated with a backwater nozzle at the bottom part of the swimming pool; a raw water inlet of the disinfection system is connected with a clear water outlet sequentially by the following pipelines: a balancing pool, a water circulating pump, an ozone water mixer, an ozone reaction pot and an ozone-removing device and a filter thereof; the ozone reaction pot air vent valves at the top part of the ozone-removing device and the filter thereof are respectively connected with a tail gas resolver. In the invention, chlorine preparation is completely not used in the normal process of processing water in the swimming pool with ozone disinfection adopted, thus greatly reducing use of chlorine in the water, and preventing generation of peculiar smell and harm to human body caused by generation of by-product cancerogen haloform. The method of the invention features safe operation, reliability, and high degree of automation, thereby being capable of being used as a main water processing method in a high standard and underload swimming pool.

Disclosed herein are systems and process integrating the chemical-free oxidation of a photocatalytic decontamination process with a biological decontamination system to eliminate the THM and HAA precursors in drinking water. In one embodiment, a system may comprise a source providing fluid media contaminated with toxic natural organic matter, and a photocatalytic decontamination subsystem configured to oxidize the toxic natural organic matter via a photocatalytic process into non-toxic natural organic matter having a molecular weight low enough for biodegrading said non-toxic matter. The system may include a biological decontamination subsystem configured to immediately receive the contaminated fluid output from the photocatalytic decontamination subsystem, and employing a biological agent to biologically degrade the low-molecular weight non-toxic natural organic matter in the contaminated fluid to a concentration sufficient to prevent the formation of trihalomethanes or haloacetic acids. Also, such a system may include a disinfectant sub-system configured to disinfect the fluid output from the biological decontamination subsystem.

A water treating method for killing the flea kind of zooplanktons by use of O3 / H2O2 features that before the water is conventionally treated, the O3 and H2O2 are proportionally added to it and then stayed in water for 20-30 min.