A kind of biological treatment process of cassava alcohol wastewater

Abstract

The invention belongs to the technical field of wastewater treatment and discloses a biological treatment process for cassava alcohol wastewater. The process comprises the following steps: after distilling the waste water, it is filtered through a grit chamber to remove silt and cassava slag, and it is treated for 5-6 hours under stirring and aeration conditions, and then the pH value is adjusted to 6-6.5; The anaerobic treatment is carried out once at ~62°C, and after screening, the second anaerobic treatment is carried out at a temperature of 38~42°C, and then enters the membrane bioreactor for denitrification treatment and mud-water separation; the separated wastewater enters The aerobic tank is used for aerobic treatment; the effluent is further treated through a nanofiltration device, or treated with a downflow continuous fixed bed by adding water purifiers and powdered activated carbon to obtain discharge water or reuse water that meets the standards. The invention has the advantages of simple process, good treatment effect and low comprehensive cost, and realizes the harmonious unity of environmental benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a biological treatment process for cassava alcohol wastewater. Background technique [0002] The production of alcohol with cassava as raw material has a relatively broad market in my country's Guangxi, Guangdong, Hubei, Jiangsu and other provinces. In the conventional production process, the wastewater discharged per 1 ton of cassava alcohol production is about 12-15 tons, and the temperature of cassava alcohol waste liquid is high, containing a large amount of organic compounds and suspended solids, with COD as high as 30-60g / L and suspended solids as high as 20- 30g / L, low pH, typical high-concentration organic wastewater, high concentration, high viscosity, direct solid-liquid separation treatment is more difficult. And the dregs after its separation are difficult to sell as feed due to low protein content. If the wastewater cannot be treated stably...

AI Technical Summary

Problems solved by technology

Moreover, because cassava residue is particularly easy to precipitate, it will cause poor dehydration effect of belt filter press and plate and frame filter press, and damage filter bags, filter cloth, etc.

[0008] 3. Cassava residue is difficult to biodegrade

[0010] 4. Cause reactor silting, mixing difficulty, water inlet blockage

[0011] According to the characteristics of cassava slag mentioned above, once the cassava slag enters the reactor, it will be difficult to come out automatically, which will cause the effective volume of the reactor to gradually decrease, the mixing of mud and water will be difficult, the water inlet pressure will increase, and the water inlet pipe will be blocked. tank, emptying

[0012] 5. Cause the aerobic tank to be silted up and the aeration system to be blocked

[0013] Cassava residues with small particles are easy to enter the aerobic system with the water flow, deposit in the aerobic tank, and block the aeration system

Especially after staying aerated for a period of time, the clogging phenomenon is more serious