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Method for improving advanced treatment effect on wastewater containing sulfate radical and having high carbon-nitrogen ratio

A high carbon-nitrogen ratio, advanced treatment technology, applied in anaerobic digestion treatment and other directions, can solve the problem of low efficiency of biogas, and achieve the effect of improving the degradation rate of organic matter, inhibiting activity, and reducing enzyme activity

Active Publication Date: 2018-09-07
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above problems, the invention provides a method for promoting the effect of advanced treatment of high carbon-nitrogen ratio wastewater containing sulfate radicals, which overcomes the problem of sulfuric acid by adding metal elements and metal ion chelating agents in high carbon-nitrogen ratio wastewater. The problem of low biogas production efficiency in anaerobic biological advanced treatment of wastewater with high carbon-to-nitrogen ratio of roots

Method used

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  • Method for improving advanced treatment effect on wastewater containing sulfate radical and having high carbon-nitrogen ratio
  • Method for improving advanced treatment effect on wastewater containing sulfate radical and having high carbon-nitrogen ratio
  • Method for improving advanced treatment effect on wastewater containing sulfate radical and having high carbon-nitrogen ratio

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Effect test

Embodiment 1

[0045] The influent COD concentration is 6300mg / L, the sulfate concentration is 5000mg / L, the carbon-to-nitrogen ratio is 120, the inoculum concentration of domesticated anaerobic activated sludge is 30mg / L, and 100μmol / LEDTA and 40mg / L zero-valent iron are added , after mixing, seal it with a rubber stopper, and place it in a constant temperature room at 35±1°C to produce biogas anaerobically. When running to the 16th day, β-glucosidase, proteolytic enzyme, coenzyme F 420 The activities of sulfite reductase and sulfite reductase were 39856.0U / gVSS, 1160.0U / gVSS, 1.6U / gVSS and 54.6U / gVSS respectively, and the degradation rates of polysaccharide and protein in the system were 87.3% and 79.3%, respectively. At the same time, the cumulative gas production rate reached 302.2mL / gCOD, an increase of 245.0% compared with the control experiment.

Embodiment 2

[0047] The influent COD concentration is 5180mg / L, the sulfate concentration is 800mg / L, the carbon-to-nitrogen ratio is 50, the inoculum concentration of the domesticated anaerobic activated sludge is 30mg / L, and 1μmol / LEDTA and 10mg / L zero-valent iron are added , after mixing, seal it with a rubber stopper, and place it in a constant temperature room at 35±1°C to produce biogas anaerobically. When running to the 16th day, β-glucosidase, proteolytic enzyme, coenzyme F 420 The activities of sulfite reductase and sulfite reductase were 29896.0U / gVSS, 927.3U / gVSS, 1.3U / gVSS and 78.6U / gVSS respectively, and the degradation rates of polysaccharide and protein in the system were 73.2% and 66.1%, respectively. At the same time, the cumulative gas production rate reached 248.2mL / gCOD, an increase of 183.3% compared with the control experiment.

Embodiment 3

[0049] The influent COD concentration is 5890mg / L, the sulfate concentration is 2800mg / L, the carbon-to-nitrogen ratio is 80, the inoculum concentration of the domesticated anaerobic activated sludge is 30mg / L, and 48μmol / LEDTA and 20mg / L zero-valent iron are added , after mixing, seal it with a rubber stopper, and place it in a constant temperature room at 35±1°C to produce biogas anaerobically. When running to the 16th day, β-glucosidase, proteolytic enzyme, coenzyme F 420 The activities of sulfite reductase and sulfite reductase were 30045.2U / gVSS, 936.4U / gVSS, 1.1U / gVSS and 75.6U / gVSS respectively, and the degradation rates of polysaccharide and protein in the system were 77.6% and 68.9%, respectively. At the same time, the cumulative gas production rate reached 277.7mL / gCOD, an increase of 216.6% compared with the control experiment.

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Abstract

The invention discloses a method for improving the advanced treatment effect on wastewater containing sulfate radical and having a high carbon-nitrogen ratio and belongs to the technical field of wastewater treatment. According to the method for improving the advanced treatment effect on the wastewater containing the sulfate radical and having the high carbon-nitrogen ratio, the problem of low biogas production efficiency of anaerobic organism advanced treatment of the wastewater containing the sulfate radical and having the high carbon-nitrogen ratio is solved by adding metallic elements anda metal ion chelating agent to the wastewater containing the sulfate radical and having the high carbon-nitrogen ratio. With the adoption of the method, the accumulated biogas production rate of the wastewater containing the sulfate radical and having the high carbon-nitrogen ratio can reach 309.3 mL / gCOD; activity of beta-glucosidase, proteolytic enzyme and coenzyme F420 in the anaerobic processis increased to 39856.0 U / gVSS, 1195.4 U / gVSS and 1.6 U / gVSS respectively, while activity of sulfite reductase is reduced to 78.6 U / gVSS; the degradation rates of polysaccharide and protein in a biogas production system of the wastewater containing the sulfate radical and having the high carbon-nitrogen ratio are increased to 88.6%-79.9% respectively.

Description

technical field [0001] The invention relates to a method for promoting the advanced treatment effect of sulfate radical-containing wastewater with a high carbon-to-nitrogen ratio, and belongs to the technical field of wastewater treatment. Background technique [0002] According to reports, about 30-40 million tons of residual sludge from sewage treatment plants are produced in my country every year. Most of them are simply piled up and then regularly transported to landfills for landfill, or naturally air-dried and dehydrated and then incinerated for heating. These treatment and disposal methods are relatively expensive. High, and easily lead to secondary pollution of soil and atmospheric environment. [0003] Residual sludge is rich in available organic matter, which can be used to extract protein. The crude protein content in the excess sludge of my country's sewage treatment plants is about 28.7-40.9%. After the excess sludge is hydrolyzed by enzymatic hydrolysis technol...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/28
Inventor 李秀芬齐希光任月萍王新华
Owner JIANGNAN UNIV
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