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Method for removing nitrogen and phosphorus from sludge anaerobic acidification liquor

A technology of anaerobic acidification and sludge acidification, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem of easy release under anaerobic conditions, sludge production Large and other problems, to achieve the effect of low cost, reduced negative impact, and efficient removal

Inactive Publication Date: 2012-07-04
FUDAN UNIV
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Problems solved by technology

The biological method is to use the excessive absorption of soluble phosphate in sewage by microorganisms under aerobic conditions, and then precipitate and separate to remove phosphorus, but the phosphorus in sludge is easily released under anaerobic conditions
The chemical method is characterized by high phosphorus removal rate, stable treatment results, and the sludge will not re-release phosphorus in the process of treatment and disposal to cause secondary pollution, but the output of sludge is relatively large

Method used

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  • Method for removing nitrogen and phosphorus from sludge anaerobic acidification liquor
  • Method for removing nitrogen and phosphorus from sludge anaerobic acidification liquor

Examples

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Effect test

Embodiment 1

[0021] The remaining sludge from a sewage treatment plant in the south is taken from the supernatant after anaerobic fermentation. The acidified liquid first enters the storage tank for adjustment and stabilization, and then enters the first pH value adjustment tank. In the first pH adjustment tank Add 30% NaOH to adjust the pH value to about 11, stir well and make it fully mixed. Then enter the coagulation sedimentation tank, first add CaO with a molar concentration equivalent to 1.6 times the total phosphorus concentration, mix at a medium speed (150r / min) for 10min for chemical precipitation reaction; then add FeCl 3 70mg / L, stirring rapidly (300r / min) for 1min, then adding coagulant PAM0.5mg / L, stirring slowly (60r / min) for 15min, and then standing for 45min for precipitation. The precipitated supernatant enters the second pH adjustment tank, and NaOH is added to adjust the pH value to about 11, and then flows into the ammonia stripping tower, and the gas-liquid ratio of t...

Embodiment 2

[0025] The dewatered sludge from a sewage treatment plant is taken from the supernatant after anaerobic fermentation. The acidified liquid first enters the storage tank for adjustment and stabilization, and then enters the first pH value adjustment tank, and in the first pH adjustment tank, add 30% NaOH to adjust the pH value to about 11, stir well and make it fully mixed. Then enter the coagulation sedimentation tank, first add CaO with a molar concentration equivalent to 2 times the total phosphorus concentration, mix at a medium speed (200r / min) for 15min for chemical precipitation reaction; then add FeCl 3100mg / L, stir rapidly (500r / min) for 3min, then add coagulant PAM1mg / L, stir slowly (60r / min) for 30min, and then stand for 60min for precipitation. The precipitated supernatant flows into the second pH adjustment tank, adjusts the pH to about 11, and then enters the ammonia stripping tower, adjusting the gas-liquid ratio of the ammonia stripping tower to 4500, and the st...

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Abstract

The invention belongs to the technical field of environmental protection, in particular to a method for removing nitrogen and phosphorus from a sludge anaerobic acidification liquor. The method comprises the following steps of: regulating the pH value of the acidification liquor to be 10-12 by using diluted NaOH, removing the phosphorus from the acidification liquor through coagulating sedimentation by using chemical reagents, namely CaO and FeCl3 coagulants and a coagulant aid polyacrylamide (PAM), and removing the nitrogen from the acidification liquor by using an ammonia stripping process. The method has a high effect of removing the nitrogen and the phosphorus from the acidification liquor. The acidification liquor treated by the method has high capacity of serving as a denitrification carbon source, and can serve as an additional carbon source for denitrification in sewage treatment plants.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for removing nitrogen and phosphorus in sludge anaerobic acidification liquid of a sewage treatment plant. Background technique [0002] With the development of social economy and urbanization, urban sewage treatment plants have sprung up and put into operation in various cities. As of December 2011, more than 3,000 sewage treatment plants have been built and operated in my country, and the sewage treatment capacity is 136 million tons / day, and the amount of dry sludge produced is about 13,700 to 17,000 tons of DS (dry solid) / day. A large amount of sludge is generated, which not only increases the difficulty of treatment, but also increases the cost of disposal. The problem of sludge disposal is even more troublesome for sewage treatment plants. Therefore, how to utilize and dispose of sludge resources is an urgent problem and research hotspo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/66C02F1/52C02F1/56C02F1/20
Inventor 代瑞华刘燕陆颢文黄丽娜宋安安周蓓吕黎辉
Owner FUDAN UNIV
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