Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge

A technology for excess sludge, nitrogen and phosphorus, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as shortage of phosphate rock and lack of carbon sources, and achieve reduction of ammonia nitrogen and orthophosphate load, reduce the amount of hydrochloric acid, and save costs

Inactive Publication Date: 2012-08-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of lack of carbon sources in sewage treatment plants and the shortage of phosphate rocks in nature, to provide a method that can not only recycle carbon sources in excess sludge, but also facilitate the recovery of ammonia nitrogen and orthophosphate in excess sludge, so as to realize The recycling of organic carbon sources and nitrogen and phosphorus elements in excess sludge

Method used

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  • Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge
  • Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge
  • Method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge

Examples

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Effect test

example 1

[0048] (1) Take 1L of concentrated residual sludge in the batch activated sludge process reactor (total suspended solids concentration is 9212mg / L, volatile suspended solids concentration is 8007mg / L, pH6.83) into the reactor, First use sodium phosphate particles to adjust the pH of the remaining sludge to 8, then use 2.5mol / L sodium hydroxide solution to adjust the pH of the remaining sludge to 10, aerate nitrogen for 3 minutes, and then ferment in a closed reactor at 35°C. The stirring speed of the device was 100 rpm.

[0049] (2) Take a sample every 2 days, analyze the concentration of ammonia nitrogen and orthophosphate in the fermentation broth, and calculate P / N. When P / N is less than 0.9, add sodium phosphate to adjust P / N and pH value. When P / N is greater than 0.9, use sodium hydroxide to adjust the pH value of the reactor. During the operation of the reactor, the pH value was controlled at 10 ± 0.2.

[0050] (3) After the reactor has been running for 14 days, stop ...

example 2

[0055] (1) Take 1L of concentrated A 2 The remaining sludge in the O reactor (total suspended solids concentration is 10327 mg / L, volatile suspended solids concentration is 8778 mg / L, pH 7.3) is added to the reactor, and sodium phosphate particles are used to adjust the pH value of the remaining sludge to 8.5 , and then use 4mol / L sodium hydroxide solution to adjust the pH of the remaining sludge to 10, aerate nitrogen for 3 minutes and then ferment in a closed reactor at room temperature (20-22° C.), with the stirring speed of the reactor being 200 rpm.

[0056] (2) Take a sample every 2 days, analyze the concentration of ammonia nitrogen and orthophosphate in the fermentation broth, and calculate P / N. When P / N is less than 0.9, add sodium phosphate to adjust P / N and pH value. When P / N is greater than 0.9, use sodium hydroxide to adjust the pH value of the reactor. During the operation of the reactor, the pH value was controlled at 10 ± 0.2.

[0057] (3) After the reactor ...

example 3

[0061] (1) Get 5L of concentrated residual sludge (total suspended solids concentration is 12250mg / L, volatile suspended solids concentration is 10168mg / L, pH7.27) in the batch type activated sludge process reactor after being concentrated and add in the reactor, First use sodium phosphate particles to adjust the pH value of the excess sludge to 8.5, then use 4mol / L sodium hydroxide solution to adjust the pH value of the excess sludge to 10, aerate nitrogen for 3 minutes, and then close the reactor at room temperature (20-22°C ) fermentation, the stirring speed of the reactor is 180rpm.

[0062] (2) Take a sample every 2 days, analyze the concentration of ammonia nitrogen and orthophosphate in the fermentation broth, and calculate P / N. When P / N is less than 0.9, add sodium phosphate to adjust P / N and pH value. When P / N is greater than 0.9, use sodium hydroxide to adjust the pH value of the reactor. During the operation of the reactor, the pH value was controlled at 10±0.2. ...

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Abstract

The invention discloses a method for recovering carbon source and nitrogen and phosphorus elements from surplus sludge and belongs to the field of sludge and sewage treatment, aiming at deficiencies that when the surplus sludge is fermented under alkaline environment in which sodium hydroxide is only used for providing alkalinity, the mole ratio of orthophosphate to ammonia nitrogen in fermentation liquor is low, which is disadvantageous to recovery of ammonia nitrogen and phosphorus in the fermentation liquor. In the invention, the pH value of the surplus sewage is controlled at alkaline condition by utilizing the characteristic that sodium phosphate can provide both alkalinity and orthophosphate combined with a sodium hydroxide solution, and organic matters in the surplus sewage are converted into organic acid to a maximum degree by enhancing the hydrolysis of the surplus sewage and restraining the methane production process. Furthermore, the dosage of sodium phosphate is controlled to adjust the mole ratio of orthophosphate and ammonia nitrogen in the surplus sewage fermentation liquor to be (0.9-1.4):1, thus being convenient for recovery of orthophosphate and ammonia nitrogen in the surplus sewage fermentation liquor in a struvite precipitate form. According to the invention, the acid production quantity of the surplus sewage by adopting the method is equal to that under alkaline environment in which sodium hydroxide is only used for providing alkalinity, and the cost is saved.

Description

technical field [0001] The invention relates to a method for anaerobic treatment of excess sludge, which is suitable for sewage treatment plants lacking carbon sources in the process of biological denitrification and phosphorus removal of sewage, and belongs to the field of sludge and sewage treatment. Background technique [0002] There are two serious problems in domestic sewage treatment plants. On the one hand, with the development of the sewage treatment industry, a large amount of excess sludge is produced in the process of wastewater treatment, and the treatment and disposal costs of excess sludge account for 50-60% of the operation and management costs of sewage treatment plants. On the one hand, the process of biological denitrification and phosphorus removal of sewage requires easily degradable organic matter, and the waste water often lacks easily degradable organic matter, so it is necessary to add additional carbon sources, such as methanol, sodium acetate and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 彭永臻苏高强袁悦王淑莹
Owner BEIJING UNIV OF TECH
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