Method for treating high-concentration cassava alcohol wastewater by continuous full-mixing anaerobic reaction

A technology of cassava alcohol and anaerobic reaction, which is applied in anaerobic digestion treatment, special treatment targets, natural water treatment, etc., can solve the problem of difficult handling of suspended solids, achieve high-value utilization, improve processing capacity, and increase production The effect of volume and utilization value

Inactive Publication Date: 2017-08-18
上海中溶科技有限公司
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AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that uses continuous full-mixing type anaerobic fermentation biogas system to process high-concentration cassava...

Method used

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  • Method for treating high-concentration cassava alcohol wastewater by continuous full-mixing anaerobic reaction
  • Method for treating high-concentration cassava alcohol wastewater by continuous full-mixing anaerobic reaction
  • Method for treating high-concentration cassava alcohol wastewater by continuous full-mixing anaerobic reaction

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Embodiment 1

[0031] ⑴ Select water quality

[0032] The waste liquid discharged from the alcohol distillation tower is used as the treated water. The COD content in the waste water is relatively high, and the carbon, nitrogen, and phosphorus elements can meet the requirements of microorganisms for nutrients, and there is no need to add additional nutrients; the technical index of water quality is: bad liquid The temperature is as high as ±90 ℃, and the water quality is COD (mg / L) 20000-60000, pH3.0-6.0, SS (g / L) 25-40.

[0033] ⑵Operation method

[0034] a. Start the system at 55°C;

[0035] b. Add sludge to the water quality according to the volume ratio, and add 4% of the dry weight of the sludge, put the sludge with a water content of 75.6% into the system reactor, and cultivate the sludge for 1 day for domestication;

[0036] c. On the second day, the cassava alcohol wastewater was added to the fully mixed anaerobic reactor for hydraulic agitation and mixing through the circulation p...

Embodiment 2

[0045] The method utilizes a system capable of continuous feeding to treat waste water, and the treated water becomes standard water, and at the same time biogas is obtained. For the structure of the system, see figure 1 , including four parts: continuous feeder 1, feed pump 2, anaerobic reactor 3, liquid outlet device 4, biogas collection device 5 and temperature pH electrode. The total volume of the reactor is 5000M³, of which 4500M³ is used to treat wastewater, and the upper 500M³ is used to store digested biogas, and the hydraulic circulation system that comes with the tank is used for material mixing. Use direct heating and heat exchange system to maintain the temperature at 55 °C. Wastewater enters the reactor from the feed system through the feed pump.

[0046] The operation steps are as follows:

[0047] a. Start the system at 58°C;

[0048]b. Add sludge to the water according to the volume ratio of 6% of the dry weight of the sludge, and inject the sludge with a w...

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Abstract

A method for treating high-concentration cassava alcohol wastewater by continuous full-mixing anaerobic reaction employs effluent from an alcohol distilling column as water to be treated and anaerobic sludge as inoculated sludge; the method comprises the steps of starting the system at 50-60 DEG C; adding sludge proportionally into a system reactor, and domesticating by air culture; adding the cassava alcohol wastewater into a full-mixing anaerobic reactor, hydraulically stirring, adjusting initial load, increasing the load gradually, increasing quantity so that volumetric load reaches 7-9 kg COD/(m<3>.d), allowing full contact between the sludge and the wastewater, anaerobically digesting to convert organic matters in the wastewater into biogas and water into standard water; collecting a sample from the full-mixing anaerobic reactor each day, and measuring COD (chemical oxygen demand) by a potassium dichromate method; precisely measuring biogas yield with a gas flowmeter; analyzing biogas composition with a gas chromatograph. The problem that high-concentration suspended solid wastewater is difficult to treat is solved, and the gas yield and utilization value of waste are increased.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a continuous full-mix anaerobic reaction method for treating cassava alcohol wastewater. Background technique [0002] Cassava is a common raw material for the production of fuel ethanol, with low cost, in line with the national policy of "not competing with the people for food", and has good economic value. At present, cassava ethanol occupies an absolute dominant position in the production of fuel ethanol in my country. However, when cassava is used to produce ethanol, a large amount of waste water will be generated, and the waste water is rich in organic matter. According to the national regulations, the secondary standard of COD concentration value allowed to be discharged from alcohol industry wastewater after treatment is 300 mg / L, and the primary standard requires less than 100 mg / L. Therefore, wastewater needs to be properly treated before it can be discharged. Pay attent...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F103/32
CPCC02F3/28C02F3/2893C02F2103/325C02F2301/10C02F2303/22Y02E50/30
Inventor 李秋园代淑梅
Owner 上海中溶科技有限公司
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