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Active biological filter material and sewage high-efficiency nitrogen and phosphorus removal method using the same

A technology of biological filter material and biological membrane method, applied in biological water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of low oxygen utilization rate, influence, poor phosphorus removal performance, etc. , to achieve the effect of improving overall efficiency, improving removal efficiency, and good bioaffinity

Inactive Publication Date: 2020-11-06
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume utilization rate of the reactor is low, the peak oxygen demand is large, and the oxygen utilization rate of the whole system is low and cannot be operated continuously
The CASS process is an improved process of the SBR method. The sludge sedimentation effect of this process is good, the residual sludge is less and the sludge bulking is not easy to occur. However, due to the competitive growth of heterotrophic bacteria and nitrifying bacteria, the growth of nitrifying bacteria is inhibited and the nitrification reaction effect is reduced. The anaerobic phosphorus release in the selected area is affected by the reflux nitrification liquid, and the phosphorus removal performance is poor

Method used

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  • Active biological filter material and sewage high-efficiency nitrogen and phosphorus removal method using the same
  • Active biological filter material and sewage high-efficiency nitrogen and phosphorus removal method using the same
  • Active biological filter material and sewage high-efficiency nitrogen and phosphorus removal method using the same

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Experimental program
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preparation example Construction

[0036] The preparation steps of the active biological filter material are as follows:

[0037] (1-1) Use calcium, silicon, aluminum inorganic mineral elements as the main raw materials, and conduct quantitative analysis of their chemical composition;

[0038] (1-2) Determine the ratio of raw materials according to the calcium-silicon-aluminum ternary phase diagram;

[0039] (1-3) Mix the raw materials evenly with a cement mortar mixer, control the water-solid ratio within the range of 0.02-0.1, and then make green balls through a centrifugal ball forming machine;

[0040] (1-4) Naturally cured the raw balls at room temperature for 24 hours, then dried them in a drying oven at 105°C for 12 hours, and finally put them into a high-temperature calciner for calcination at a heating rate of 5-10°C / min. Furnace cools.

[0041] The raw materials for the preparation of active biological filter materials are widely selected, the calcination temperature is 900-1100°C, and the particle ...

Embodiment 1

[0066] Select papermaking lime mud (50wt%) and fly ash (50wt%) as raw materials, adjust the water-solid ratio to 0.05 for stirring, and make green balls through a centrifugal ball forming machine, and dry the green balls at 105°C after natural curing for 48 hours , and then calcined at 1050°C and held for 2 h, and finally cooled in the furnace. The prepared active biological filter cartridge has a compressive strength of 7.0MPa, a 24h water absorption rate of 31.72%, and a porosity of 25.3%. The main phases are anorthite and anorthite.

Embodiment 2

[0068] according to figure 1 As shown, the biofilm reactor was assembled. The biofilm reactor is a transparent double-layer plexiglass column with an inner diameter of 60mm and a height of 600mm, and the filling height of the filter material is 360mm. The bottom of the biofilm reactor is equipped with an aeration head and a water inlet pipe, and adopts an upward flow operation mode. When the biofilm reactor is started, the inoculation and film formation method is adopted, and the aerobic activated sludge is mixed with C 6 h 12 o 6 (500mg / L) and NH 4 Cl (100mg / L) solution was diluted, introduced into the reactor until the filter material was completely submerged, the air intake was adjusted to about 6L / h, and exposed for 2 days. The simulated sewage containing nitrogen and phosphorus (500mg / L C 6 h 12 o 6 , 100mg / L NH 4 Cl, 20mg / LKH 2 PO 4 , 200mg / L MgSO 4 ·7H 2 O, 10mL / L trace element solution SL-4), control the influent flow rate to 0.021L / h, the hydraulic retent...

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Abstract

The invention provides an efficient nitrogen and phosphorus removal method for sewage. The efficient nitrogen and phosphorus removal method comprises the following steps of: 1, preparing an active biological filter material; 2, starting a biofilm process reactor: putting the active biological filter material into the biofilm process reactor: putting the active biological filter material into the biofilm process reactor, introducing aerobic activated sludge by adopting an inoculation biofilm culturing method, preparing nitrogen and phosphorus-containing simulated sewage from NH4Cl and KH2PO4, conducting smoldering for 2 days, then feeding water in an upward flow mode, controlling the water inlet flow speed at 0.01L / h and the hydraulic retention time at 67h, conducting sampling every day todetect ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, the total phosphorus concentration and the pH value of inlet water and outlet water, and when the surface of the active biological filter material has a viscous feeling and the ammonia nitrogen removal rate is stabilized to be 60% or above, indicating that biofilm culturing is started successfully; and 3, performing operating in an upward flow mode, controlling the water inlet flow rate to be 0.021L / h and the hydraulic retention time to be 32h, and performing sampling and detecting every day until the ammonia nitrogen removal rate ishigher than 90%. The prepared active biological filter material is good in biocompatibility and high in biofilm culturing speed, so that the whole starting period of nitrogen and phosphorus removal is shortened, and the overall efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an active biological filter material and a method for efficiently denitrifying and dephosphorizing sewage using the same. Background technique [0002] Most of the phosphorus discharged into water bodies comes from domestic sewage, factory and animal husbandry wastewater, fertilizer loss from mountain forests and cultivated land, and rainfall and snowfall. In domestic sewage, 80% of phosphorus comes from human excretion, and the rest comes from washing wastewater and food waste. Phosphorus is a key nutrient that causes water eutrophication. The eutrophication of the water body will not only lead to the rapid growth of algae in the water, but also cause a sharp drop in the oxygen content of the water body, affecting the survival of aquatic organisms such as fish. [0003] With the development of industries such as petroleum, chemical industry, food and pharmaceuticals, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/10C02F101/16
CPCC02F3/301C02F2101/16C02F2101/105C02F2003/001
Inventor 王俊跃秦娟欧昌进吴妤婕杨文轩徐婕戴苏皖农正杰刘蔚汤若文
Owner NANTONG UNIVERSITY
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