Method for processing organic wastewater

A technology for organic waste water treatment and waste water, applied in the direction of anaerobic digestion treatment, etc., can solve the problems of reducing the effective volume of the reactor, increasing the pH value of the waste water, and stopping the reactor, so as to improve the capacity of treating waste water, ensure stable operation, and ensure normal effect

Inactive Publication Date: 2007-12-26
HENAN AGRICULTURAL UNIVERSITY
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Problems solved by technology

However, due to the gradual application of wheat and other raw materials in alcohol and other industries, the problems in the wastewater treatment process have also emerged. The main problem is that the traditional process of anaerobic treatment often leads to inability to treat it. The main reason is that wheat and the original Raw materials for alcohol production are very different in composition. Compared with dried cassava and dried sweet potato, the crude protein and crude fat content of wheat is much higher than the above two raw materials, which directly leads to the lower pH value of wastewater from alcohol production. About 4.0, which is far lower than the fermentation pH value of methane bacteria (6.2-7.8), coupled with the organic acid produced by acid-producing bacteria, will lead to a lower pH value of wastewater in the reactor, which seriously inhibits the activity of methane bacteria and is harmful to organic Acid utilization is reduced, which in turn further exacerbates the drop in wastewater pH and the system shuts down entirely
[0004] There are still some deficiencies in the existing wastewater treatment process: First, the low-load process is adopted under low temperature conditions, and the mixing intensity in the sludge bed is too small to produce a short-flow effect, and the application load and gas production rate of the UASB reactor are limited
The second is the change of wastewater with different concentrations, especially high-concentration wastewater will impact the UASB reactor. When the pH is too low, it will cause the reactor to stop. In addition, the suspended matter in the wastewater will also affect the granulation of sludge, or reduce the reaction. The effective volume of the device, or even cause blockage

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  • Method for processing organic wastewater

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1, the UASB reactor step of wheat alcohol waste water treatment equipment set up adjustment pool, high-concentration alcohol waste water first passes through solid-liquid preliminary separation, puts into waste water pool after the grit chamber settles, and the pH value of the alcohol waste water to be treated is 4.0, will The treated digestive juice is partially refluxed from the upper outlet of the UASB reactor to the regulating tank with a reflux ratio of 1.5. The untreated waste water is mixed in the regulating tank. The pH value of the mixed solution is measured to be 6.5. The speed is controlled at 1.0m / h, and the reactor is running. Use a precision pH meter and a COD quick tester to test the wastewater and digestive fluid, and the results are as follows:

[0015] Test data before and after reflow

[0016] alcohol wastewater

Embodiment 2

[0017] Embodiment 2, the UASB reactor step of dried potato alcohol wastewater treatment equipment set up a regulating tank, the high-concentration alcohol wastewater is put into the wastewater tank after the preliminary solid-liquid separation, and the grit chamber settles, and the pH value of the alcohol wastewater to be treated is measured as 5.5. Return the treated digestive liquid from the upper outlet of the UASB reactor to the regulating tank, and mix it with untreated wastewater. The reflux ratio is 1, and the pH value of the mixed liquid is 6.2. Pump the mixed liquid into the reactor , the upflow velocity is controlled at 1.0m / h, and the reactor is running. Use a precision pH meter and a COD quick tester to test the wastewater and digestive fluid, and the results are as follows:

[0018] Test data before and after reflow

[0019] alcohol wastewater

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Abstract

This invention relates to a method for treating organic wastewater. The method comprises: treating in UASB reactor, returning the digestive liquid to the wastewater not subjected to UASB reactor treatment, mixing, and sending into UASB reactor for treatment. The method can prevent the unbalance of acidification-methanation process in UASB reactor, ensure stable operation of wastewater treatment in UASB reactor, effectively adjust hydraulic load of UASB reactor, and prevent short flow effect. The treated digestive liquid can dilute high-concentration organic wastewater, and reduce the impact of wide range change of organic matter content in wastewater to UASB reactor.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to an organic wastewater treatment method utilizing a UASB (Up-flow Anaerobic Sludge Blanket) reactor. Background technique [0002] Water resources are very important resources to ensure the development of people's life and production. The arbitrary discharge of waste water will pollute precious water resources, thereby damaging people's health and hindering the development of social production. Effective treatment and rational utilization of high-concentration organic wastewater can greatly reduce environmental pollution, effectively utilize resources, and achieve the dual purposes of treatment and energy development, which is conducive to the recycling of resources and the sustainable development of industries. Wastewater treatment technology can be divided into physical method, chemical method and biological method according to different operating principles, and biological metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 张世敏杨历军贾新成陈红歌陆浩阳张跃玺杜风光
Owner HENAN AGRICULTURAL UNIVERSITY
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