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Process for bio-denitrifying sewage

A biological denitrification, sewage biological technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc. and other problems to achieve the effect of saving operating costs and preventing secondary pollution

Inactive Publication Date: 2005-06-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high nitrogen content of the secondary biological treatment effluent is still a serious source of environmental pollution
Nitrogen pollution is very harmful
Ammonia entering the water body can not only induce "eutrophication" and cause the disorder of the aquatic ecosystem, but also can ①consume dissolved oxygen and cause water hypoxia; ②affect the oxygen transfer of strontium in fish and cause fish death; ③interact with chlorine gas Generate chloramines, affecting chlorination disinfection treatment
After ammonia is converted into nitrate, although the ability to consume dissolved oxygen in the water body no longer exists, it can still cause "eutrophication". Nitrate that pollutes drinking water may also cause methemoglobinemia in infants, and nitrate is further converted into nitrous Amines have "three-caused" effects, directly threatening human health

Method used

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  • Process for bio-denitrifying sewage
  • Process for bio-denitrifying sewage
  • Process for bio-denitrifying sewage

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Experimental program
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Effect test

Embodiment

[0035] 1. The biological denitrification system is composed of aerobic contact tank (2L) and anaerobic sludge bed reactor (3L), and the system is tested with simulated ammonia-containing wastewater. 1) The relevant parameters of the aerobic contact tank are: 20~30℃, HRT12~15 hours, influent pH7.5~8.0, ammonia nitrogen concentration 30~420mg / L, ammonia nitrogen volume load 0.06~1.0g / L.d, ammonia nitrogen removal rate 95-100%. The relevant parameters of the anaerobic sludge bed reactor are: 20~30℃, HRT12~18 hours, influent pH7.5~8.0, ammonia nitrogen concentration 30~420mg / L, nitrate nitrogen concentration 35~450mg / L, total nitrogen volume The load is 0.06~1.0g / L.d, the removal rate of ammonia nitrogen is 90~98%, and the removal rate of nitrate nitrogen is 96~100%.

[0036] 2. The biological denitrification system is composed of an air-lift internal circulation bioreactor (20L) and anaerobic fluidized bed reactor (23L), and the system is operated and tested with anaerobic diges...

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Abstract

A process for bio-denitrifying sewage includes such steps as feeding part of ammonia-contained sewage directly into anaerobic ammonia oxidizing unit, feeding rest of said sewage into biologically nitrating unit to oxidize ammonia to nitrate, and further feeding it into anaerobic ammonia oxidizing unit. The operating condition is 20-35 deg.C, 7.0-8.5 of pH value and 5-15 hr of stay time of biological nitrating unit, or 20-35 deg.C, 7.0-8.5 of pH value and 8-18 hr of stay time for anaerobic ammonia oxidizing unit. Its advantages include low cost, no secondary pollution and low energy consumption for supplying oxygen.

Description

technical field [0001] The invention relates to a sewage biological denitrification method. Background technique [0002] With the development of industrial and agricultural production and the improvement of people's living standards, especially with the implementation of various "vegetable blue projects", the discharge of nitrogen-containing organic matter has increased sharply. Secondary biological treatment has been launched one after another, which has played a very good role in curbing organic pollution. However, the nitrogen content of secondary biological treatment effluent is relatively high, which is still a serious source of environmental pollution. Nitrogen pollution is extremely harmful. Ammonia entering the water body can not only induce "eutrophication" and cause the disorder of the aquatic ecosystem, but also can ①consume dissolved oxygen and cause water hypoxia; ②affect the oxygen transfer of strontium in fish and cause fish death;...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/00C02F3/28
Inventor 郑平胡宝兰
Owner ZHEJIANG UNIV