Biological nitrogen removal technology implemented under low temperature and low carbon source conditions

A biological denitrification and process technology, applied in the direction of biological water/sewage treatment, aerobic and anaerobic process treatment, water pollutants, etc., can solve the problems that do not conform to the circular economy, the external temperature of the effluent water quality is greatly affected, and the long hydraulic retention time To achieve the effect of reducing the amount of excess sludge, reducing the cost of construction and maintaining the concentration of sludge

Inactive Publication Date: 2016-01-20
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using natural solid organic matter as the carbon source of the denitrification system also has some problems to be solved urgently, such as the need for a long hydraulic retention time, and the quality of the effluent is greatly affected by the external temperature, etc.
In addition, the purpose of the operation of the sewage treatment system is to remove pollutants, and the method of adding carbon sources adds new pollutants to the sewage treatment system, which is not in line with the concept of circular economy

Method used

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  • Biological nitrogen removal technology implemented under low temperature and low carbon source conditions
  • Biological nitrogen removal technology implemented under low temperature and low carbon source conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The sewage treatment system used in this embodiment is as figure 1 shown. It is composed of UAAR, nitrification tank and sedimentation tank in series. The nitrification tank and the sedimentation tank are respectively equipped with mixed liquor and sludge return devices, and the incoming water, reflux mixed liquor, and returned sludge all enter the reactor from the top of the UAAR through the diversion pipe. UAAR is equipped with a ring-mounted partition to divide it into inner and outer layers. The diversion pipe guides the mixed liquid into the bottom of the inner layer. The water flows from bottom to top in the inner layer, flows to the outer layer, flows into the inner layer from top to bottom, and continues to circulate. At the same time, there is a stirring paddle inside the inner layer to fully mix the water flow in the inner layer. The effluent from UAAR enters the nitrification tank through the overflow, and the water flows through the nitrification tank firs...

Embodiment 2

[0028] The sewage treatment system used in this embodiment is as figure 1 As shown, the effluent of the grit chamber of a sewage plant in the south is used as the water inflow of the small test device, and the return sludge of the secondary settling tank of the sewage plant is used as the inoculation sludge. The operating time is from December to March in winter. The average temperature of the environment where the small test device is located is 13.5°C, and the average water temperature is 11.5°C. And water BOD 5 / TKN<4, belongs to low carbon nitrogen ratio sewage.

[0029] After 30 days of start-up period, the denitrification process can reach a stable operation state. In this example, the mixed liquor reflux ratio is 200%, and the sludge reflux ratio is 100%. Sewage enters the following working sections in turn:

[0030] (1) UAAR: MLSS gradually increases from top to bottom, ranging from 3000 to 15000mg / L; the hydraulic retention time is 6h, and the solid retention time...

Embodiment 3

[0035] The sewage of a pig farm in the south was used as the water for the small test device. The concentration of ammonia nitrogen in the sewage reaches 500~1000mg / L, and the influent BOD 5 / TKN<4, belongs to low carbon nitrogen ratio sewage.

[0036] The sewage treatment system used in this embodiment is as figure 1 shown. The hydraulic retention time of sewage is 28h, and the residence time in UAAR and nitrification tank are 12h and 16h respectively. The reflux ratio of the mixed liquid in the nitrification tank is 600%, and the reflux ratio of the sludge in the sedimentation tank is 100%. Under this working condition, the COD removal rate can reach more than 90%, the effluent COD concentration is lower than 400mg / L, and the BOD5 concentration is lower than 50mg / L. The average removal rate of ammonia nitrogen is 93.4%, and the average concentration of effluent is less than 50mg / L. In the case of no external carbon source, the removal rate of total nitrogen reaches 70%....

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Abstract

The invention relates to a biological nitrogen removal technology implemented under the low temperature and low carbon source conditions. An up-flow anoxic/anaerobic reactor (UAAR), a nitration tank and a sedimentation tank are involved in the technology. The UAAR integrates the functions of primary sedimentation, anaerobic treatment, anoxic treatment and sludge thickening. A bottom sludge hopper, with a better water flow state and a larger effective depth, in the reactor provides conditions for sludge to be subjected to anaerobic acidification and generate VFAs in the sludge hopper, a carbon source easy to use biologically is supplemented to the system, and therefore the system can achieve nitrogen removal under the low temperature and low carbon source conditions. Compared with the prior art, only three structures are involved in the technology, the technology is simple, the tedious arrangement of multiple tanks is omitted, the occupied area is reduced, and the construction cost is lowered; an up-flow push mode is adopted for the main structure, namely the novel UAAR, high sludge concentration can be kept, high impact loads can be borne, and through up-flow mixing, stirring energy needed by a traditional technology is greatly lowered; a good nitrogen removal effect can be achieved without adding carbon sources, and the COD of effluent at low temperature, the ammonia nitrogen concentration and the total nitrogen concentration can reach the level A standard; the sludge concentration is high, the SRT is long, and the amount of excess sludge is greatly reduced.

Description

technical field [0001] The invention relates to a biological denitrification process under the condition of low temperature and low carbon source. Background technique [0002] Many sewage treatment plants in my country, especially those in the south, generally have the practical problem of low carbon and high nitrogen and phosphorus in the raw water entering the plant, which has become an important factor restricting biological nitrogen and phosphorus removal. In order to obtain ideal denitrification and phosphorus removal effects, it is necessary to provide sufficient carbon sources to supplement the requirements of denitrification and denitrification electron donors and phosphorus removal requirements. The source is the key to improving nitrogen and phosphorus removal in sewage. At the same time, with the acceleration of urbanization and industrialization, the amount of wastewater produced has increased sharply, the rate of sewage treatment has increased year by year, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34C02F101/16
Inventor 张杰王妍昱周佚芳由伟孙慧明陈钢许丽萍
Owner TONGJI UNIV
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