Carbon source (carbon source) refers to the nutrient substances that provide the carbon element for the construction of microbial cells and metabolic products. Introduction: Carbon source (carbon source) is a compound containing carbon elements that can provide nutrients for the growth and metabolism of microorganisms in the biochemical treatment systems of polluted (waste) water. Carbon sources are divided into single carbon sources and composite carbon sources. Our company provides customers with composite carbon sources, which are characterized by stable performance and high utilization rate.