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Method for biologically removing phosphorus by using acid produced by mixing municipal sludge and organic wastes

A technology for organic waste and biological phosphorus removal, applied in biological sludge treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as less research

Inactive Publication Date: 2013-08-14
HUAIHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the domestic research is on the hydrolysis and acidification of sewage with high concentration, and there are few studies on the acid production of sludge in urban sewage plants for biological phosphorus removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a method of mixing municipal sludge and organic waste to produce acid for biological phosphorus removal, the steps are as follows:

[0018] (1) Put wastewater, organic waste and settled anaerobic sludge from the sewage treatment plant into the reactor, the weight ratio of anaerobic sludge to organic waste is 1:2, and use sodium bicarbonate to adjust the materials in the reactor pH to 6;

[0019] (2) Put the material in the reactor for 5 hours for pretreatment, and quickly fill the reactor with N after the pretreatment 2 To remove the air in the reactor, maintain the anaerobic state in the reactor, and treat for 3 h ；

[0020] (3) Put NH into the reactor 4 Cl and KH 2 PO 4 As a nitrogen source, control the material NH in the reactor +3 – The N content is 25mg / L, the material temperature is 20°C, and the circulation pump is used for anaerobic circulation for 200h, aeration for 5h, and drainage after 14-h of static settlement.

Embodiment 2

[0021] Embodiment 2, a method of mixing municipal sludge and organic waste to produce acid for biological phosphorus removal, the steps are as follows:

[0022] (1) Put wastewater, organic waste and settled anaerobic sludge from the sewage treatment plant into the reactor, the weight ratio of anaerobic sludge to organic waste is 1: 3, and use sodium bicarbonate to adjust the material in the reactor pH to 7;

[0023] (2) Put the materials in the reactor for 10 h for pretreatment, and quickly fill the reactor with N after the pretreatment 2 To remove the air in the reactor, keep the anaerobic state in the reactor, and treat for 6 h ；

[0024] (3) Put NH into the reactor 4 Cl and KH 2 PO 4 As a nitrogen source, control the material NH in the reactor +3 – The N content is 35mg / L, the material temperature is 25°C, the circulation pump is used for anaerobic circulation for 220 hours, aeration for 7 hours, and drainage after 16 hours of static settlement.

Embodiment 3

[0025] Embodiment 3, a method of mixing municipal sludge and organic waste to produce acid for biological phosphorus removal, the steps are as follows:

[0026] (1) Put wastewater, organic waste and settled anaerobic sludge from the sewage treatment plant into the reactor, the weight ratio of anaerobic sludge to organic waste is 1:2.5, and use sodium bicarbonate to adjust the materials in the reactor pH to 6.5;

[0027] (2) Put the material in the reactor for 5 hours for pretreatment, and quickly fill the reactor with N after the pretreatment 2 To remove the air in the reactor, keep the anaerobic state in the reactor, and treat for 4h ；

[0028] (3) Put NH into the reactor 4 Cl and KH 2 PO 4 As a nitrogen source, control the material NH in the reactor +3 – The N content is 30mg / L, the material temperature is 20°C, the circulation pump is used for anaerobic circulation for 215 hours, aeration for 6 hours, and drainage after 15 hours of static settlement.

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Abstract

The invention relates to a method for biologically removing phosphorus by using acid produced by mixing municipal sludge and organic wastes. The method comprises the following steps of: adding wastewater, organic wastes and settled anaerobic sludge from a sewage treatment plant into a reactor, and adjusting the pH value of materials in the reactor to 6-7 by using sodium bicarbonate, wherein the weight ratio of the anaerobic sludge to the organic wastes is 1:(2-3); standing the materials in the reactor for 5-10h, then pre-treating the materials, rapidly and continuously supplementing N2 into the reactor after the pre-treatment is ended to exhaust the air in the reactor, keeping the anaerobic state of the reactor, and treating the materials for 3-6h; and adding NH4C1 and KH2PO4 as nitrogen sources into the reactor, controlling the NH<+3>-N content of the materials in the reactor at 25-35mg / L and the temperatures of the materials at 20-25 DEG C, carrying out anaerobic circulation by using a circulating pump for 200-220h, aerating for 5-7h, statically settling for 14-16h, and then, draining water. The method provided by the invention is reasonable in design, simple in operation and good in phosphorus removal effect.

Description

technical field [0001] The invention relates to a treatment method for municipal sewage and organic waste, in particular to a method for mixing municipal sludge and organic waste to produce acid for biological phosphorus removal. Background technique [0002] Due to the wanton discharge of domestic wastewater rich in elements such as carbon, nitrogen, and phosphorus into natural water bodies, these elements can eventually lead to eutrophication of water bodies through enrichment effects. At present, there have been a lot of researches on the treatment of domestic and municipal wastewater. Among them, the research on the removal of phosphorus started relatively late, and it was not started until the 1980s and 1990s. Although there have been a lot of research reports on phosphorus removal technology, the microbial mechanism in phosphorus removal has not been fully clarified, and there are many imperfections in process development, which greatly limit the removal efficiency of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F3/34
Inventor 徐国想陈文宾周正胡庆昊
Owner HUAIHAI INST OF TECH
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