Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect

A fermentation broth, organic acid technology, applied in biological sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve unreported problems, reduce pollution, reduce usage, and reduce costs Effect

Active Publication Date: 2014-07-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report on the method of combining the above two technologies to remove nitrogen and phosphorus in sludge fermentation liquid to improve the effect of organic acid reuse.

Method used

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  • Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect
  • Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect
  • Method for removing nitrogen phosphorus from sludge fermentation liquid to improve organic acid recycling effect

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Take 0.8L of excess sludge and add it to the reactor. The total suspended solid concentration of the excess sludge is 32000mg / L, and the volatile solid concentration is 13000mg / L; use a pH meter to detect the pH change in the reactor in real time and control the reaction The pH value of the remaining sludge in the reactor is 9, and the temperature of the reactor is 40°C;

[0027] (2) After 20 days of anaerobic fermentation of the remaining sludge, take a sludge sample and centrifuge at 5000 rpm for 15 minutes to obtain 100 mL of supernatant, which contains 114 mg COD / gVSS of organic acid, 43 mg of ammonia nitrogen, and 14 mg of orthophosphate;

[0028] (3) Control the supernatant at pH=9, add 0.583g of alkali residue modified by sodium hydroxide alkali washing to the supernatant, and control the mass ratio of alkali residue to orthophosphate to 24mg orthophosphate / g alkali slag, after reacting at 35°C for 24 hours, the quality of orthophosphate was reduced to ...

Embodiment 2

[0031] (1) Take 0.8L of excess sludge and add it to the reactor. The total suspended solid concentration of the excess sludge is 32000mg / L, and the volatile solid concentration is 13000mg / L; use a pH meter to detect the pH change in the reactor in real time and control the reaction The pH value of the remaining sludge in the reactor is 9, and the temperature of the reactor is 40°C;

[0032] (2) After 20 days of anaerobic fermentation of the remaining sludge, take a sludge sample and centrifuge at 5000 rpm for 15 minutes to obtain 100 mL of supernatant, which contains 114 mg COD / gVSS of organic acid, 43 mg of ammonia nitrogen, and 14 mg of orthophosphate;

[0033] (3) Control the supernatant at pH=9, add 1.75g ​​of alkali residue modified by sodium hydroxide alkali washing to the supernatant, and control the mass ratio of alkali residue to orthophosphate to 8mg orthophosphate / g alkali slag, after reacting at 35°C for 30 hours, the mass of orthophosphate was reduced to 3.1 mg...

Embodiment 3

[0036] (1) Take 0.8L of excess sludge and add it to the reactor. The total suspended solid concentration of the excess sludge is 24000mg / L, and the volatile solid concentration is 10200mg / L; use a pH meter to detect the pH change in the reactor in real time and control the reaction The pH value of the remaining sludge in the reactor is 10, and the temperature of the reactor is 35°C;

[0037] (2) After the remaining sludge was anaerobically fermented for 15 days, the sludge sample was taken and centrifuged at 5000 rpm for 15 minutes to obtain 100 mL of supernatant, which contained 101.6 mg COD / gVSS of organic acid, 36 mg of ammonia nitrogen, and 12.4 mg of orthophosphate;

[0038](3) Control the supernatant at pH=10, add 0.517g of alkali residue modified by sodium hydroxide alkali washing to the supernatant, and control the mass ratio of alkali residue to orthophosphate to 24mg orthophosphate / g alkali slag, after reacting at 35°C for 24 hours, the mass of orthophosphate w...

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Abstract

The invention belongs to the technical field of novel environmental protection, and particularly relates to a method for removing nitrogen phosphorus from a sludge fermentation liquid to improve an organic acid recycling effect. The remaining sludge alkaline anaerobic fermentation liquid contains organic acids, wherein a lot of nitrogen phosphorus is mixed in the organic acids, such that the organic acids in the fermentation liquid are not easily adopted as a carbon source to be recycled in city sewage treatment plants. Ammonia alkali plant residues (short for alkali residue) and a molecular sieve are combined to absorb nitrogen phosphorus in the fermentation liquid, and the treated fermentation liquid can be adopted as the carbon source to be recycled in the sewage plant. According to the present invention, the alkali residue efficiently absorbs phosphorus, can acts with phosphorus, and then absorbs part of ammonia nitrogen, the molecular sieve can absorbs the remaining low concentration ammonia nitrogen, characteristics of the two components can be combined so as to remove the nitrogen phosphorus in the remaining sludge fermentation liquid to the maximal degree, improve a recycling effect of the organic acids in the fermentation liquid, reduce additional carbon source cost in the sewage treatment plant, achieve sludge resource utilization, recycle the ammonia alkali plant residues, and achieve waste treatment effect by adopting the waste.

Description

technical field [0001] The invention belongs to the field of novel environmental protection technologies, and in particular relates to a method for removing nitrogen and phosphorus in sludge fermentation liquid to improve the recycling effect of organic acids. Background technique [0002] With the further development of sewage treatment technology, the proper disposal of excess sludge has attracted more and more attention. Due to the various disadvantages of sludge disposal methods, more and more people pay more and more attention to the recycling of sludge. In addition, because easily degradable organic matter is needed as a carbon source in the biological denitrification and phosphorus removal process of sewage, but such carbon sources are often lacking in the influent of urban sewage treatment plants, so additional carbon sources, such as sodium acetate and methanol, are required. The addition of carbon sources not only increases the operating cost of the sewage plant, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F11/04
Inventor 王连军陈灿周松照黄诚沈锦优李健生刘晓东韩卫清严玉波马芳变
Owner NANJING UNIV OF SCI & TECH
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