Cassava grain stillage anaerobic treatment method

Abstract

The invention relates to a cassava wine lees anaerobic treatment method. A reactor capable of treating high concentration suspended solid content is used to treat cassava wine lees, the high temperature anaerobic digestion technology is employed, including startup and operation of an anaerobic reactor, and anaerobic digestion sludge is used for seeding in startup process of the anaerobic reactor, a relatively low initiation organic loading is arranged by diluting raw water, and the loading is gradually increased with certain extent, the organic loading reaches certain value after operating for some time, the raw water can directly enter the reactor, and reactor startup can be successfully realized. After the reactor successfully starts, the organic loading is increased by shortening HRT, in the entire operation process, MLVSS concentration is controlled to guarantee the treatment efficiency of the reactor by discharging residual sludge and parts of SS which is not digested in the cassava wine lees. The cassava wine lees anaerobic treatment method can realize startup of the anaerobic reactor in short time, the reactor operates stably, highly effective removal rate of organic matter and stable methane output can be realized, simultaneously most suspended matters can pass through anaerobic digestion and produce methane.

Description

technical field [0001] The invention belongs to the field of sewage treatment and resource utilization, and relates to an anaerobic treatment technology for a large amount of high-concentration and high-solid-content organic wastewater produced in the cassava alcohol production process, including the start-up and operation of an anaerobic reactor. Background technique [0002] During the production of cassava alcohol, a large amount of acidic high-temperature and high-concentration organic wastewater will be produced. The water inlet temperature is above 60 degrees, the pH range is 4-4.2, and the COD (chemical oxygen demand) is 40000-70000mg / L. The biodegradability of alcohol waste liquid is good, and many high-efficiency anaerobic reactors such as UASB (upflow anaerobic bioreactor) and EGSB (expanded granular sludge bed) are widely used in the treatment of alcohol waste water. However, high-efficiency anaerobic reactors have relatively high requirements for suspended solids...

AI Technical Summary

Problems solved by technology

However, cassava distiller's grains have high viscosity and soft solid particles, so the hydrophobicity is poor. Various solid-liquid separation methods such as belt filtration, vacuum filtration, and screw extrusion cannot receive satisfactory results, and the removal rate of SS (suspended solids) is only 60%. The SS content in the effluent is still as high as 8000-12000mg / L, which seriously affects the efficient operation of subsequent UASB and other reactors; in addition, the dregs obtained after solid-liquid separation are low in crude protein, low in crude fat, and high in crude fiber, which is difficult to meet the requirements of feed Nutritional requirements, therefore difficult to market as feed