Method for performing nitrogen biological removal on low-temperature low-carbon nitrogen ratio sewage

A low carbon-to-nitrogen ratio and biological denitrification technology, applied in the field of biological denitrification, can solve the problems of waste of air aeration energy consumption, low efficiency of denitrification and organic pollutant removal, and insignificant effect, so as to improve the quality of effluent, Improve nitrification efficiency and improve the effect of effluent quality

Active Publication Date: 2015-05-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to strengthen the biochemical efficiency of the anoxic-aerobic process under low temperature conditions, at present, people mainly focus on engineering measures to adjust the working parameters (sludge age and bioburden), that is, by maintaining high sludge age and low bioburden of activated sludge. , in order to achieve effective removal of refractory complex organic matter, but the characteristics of the sludge are guaranteed by the overall optimization of the environmental conditions. It is difficult to maintain the ideal sludge properties for a long time if the parameters of individual working conditions are changed. If the load is reduced alone, it is difficult

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  • Method for performing nitrogen biological removal on low-temperature low-carbon nitrogen ratio sewage
  • Method for performing nitrogen biological removal on low-temperature low-carbon nitrogen ratio sewage
  • Method for performing nitrogen biological removal on low-temperature low-carbon nitrogen ratio sewage

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Embodiment 1

[0030] A pilot test was carried out in a sewage treatment plant in the north. The treatment scale was 100t / d, and the influent water quality was as follows: COD was 150-250mg / L, ammonia nitrogen content was 35-40mg / L, and total nitrogen content was 55-75mg / L. , the SS content is 250-300mg / L, and the pH value is 6.0-8.0.

[0031] In this embodiment, the sewage is firstly homogenized (so that the waste water is evenly mixed), and then undergoes secondary precipitation after passing through the secondary anoxic-aerobic + biofilm module reactor.

[0032] The processing system used in this embodiment is as figure 1As shown, the first-stage anoxic pool 1, the first-stage aerobic pool 2, the second-stage anoxic pool 3 and the second-stage aerobic pool 4 are sequentially connected, and the liquid surface of the second-stage aerobic pool 4 is 0.3 meters A biofilm module 5 with a thickness of 0.5m is added at the place, the coverage is 1 / 3 of the total length of the pool body, 9 / 10 of ...

Embodiment 2

[0043] A sewage plant renovation project in the north, with a treatment capacity of 2000t / d, had the main problem of total nitrogen exceeding the standard in winter before the renovation. The influent water quality is as follows: COD is 200-300mg / L, ammonia nitrogen content is 30-35mg / L, total nitrogen content is 50-70mg / L, SS content is 200-250mg / L, pH value is 6.0-8.0.

[0044] In this embodiment, before the sewage is subjected to air flotation separation, it is firstly homogenized (so that the waste water is evenly mixed) and then undergoes secondary precipitation after passing through the secondary anoxic-aerobic + biofilm module reactor.

[0045] The processing system used in this embodiment is as figure 2 As shown, the first-stage anoxic pool 1, the first-stage aerobic pool 2, the second-stage anoxic pool 3 and the second-stage aerobic pool 4 are sequentially connected, and the outlet of the second-stage aerobic pool 4 is connected to the secondary sedimentation tank S...

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Abstract

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.

Description

technical field [0001] The invention relates to a method for carrying out biological denitrification of sewage, in particular to a method for carrying out biological denitrification of low-temperature low-carbon-nitrogen ratio sewage. Background technique [0002] The sewage influent of urban sewage plants has the characteristics of low carbon-to-nitrogen ratio, and its carbon-to-nitrogen ratio (COD / TN) is generally much lower than the ideal biological denitrification requirement of 10:1. Constrained by insufficient organic carbon sources, and the nitrification reaction is inhibited under low temperature conditions in the north, the denitrification effect is further weakened, making it difficult for the total nitrogen in the effluent to reach the standard. At present, the mainstream activated sludge process in urban sewage plants is anoxic-aerobic process, which has the advantages of stable operation, simple operation and maintenance, and effective denitrification. [0003]...

Claims

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Application Information

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IPC IPC(8): C02F3/30
CPCC02F3/301C02F2101/16C02F2101/30
Inventor 陈秀荣施震东何怡萱唐庆杰王璐李佳慧张玉莹
Owner EAST CHINA UNIV OF SCI & TECH
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