Adding external carbon sources to sewage treatment plants can improve the degradation efficiency of COD and the microbial activity of sludge in the biological pool. The carbon sources commonly used include single carbon sources and composite carbon sources.
Composite carbon source refers to a carbon source that is mixed with a variety of carbon source raw materials. Commonly used composite carbon sources include: wort, corn steep liquor, fruit juice, food processing wastewater, brewing industry, pharmaceutical industry and other industries. Waste water, starch and other organic matter. Taking wort as an example, it is composed of a variety of complex organic matter such as monosaccharides, disaccharides, and polysaccharides. It has excellent biodegradability and can degrade a large amount of organic matter present in mechanized life and sewage. Type and quantity also play a role.