Yucheng A Certain Pharmaceutical Co., Ltd. is a manufacturer that produces the pharmaceutical raw material xylitol from corn cobs through processes such as hydrolysis, decolorization, ion exchange, hydrogenation, evaporation, crystallization, centrifugation, and drying. During the production process, the wastewater generated contains a large amount of organic substances such as corn cob residues, lignin, and SS, as well as inorganic substances such as SO42- ions, and has a high concentration that is difficult to degrade. Moreover, due to the long production process and the irregular intermittent discharge of wastewater, the water quality and quantity of each wastewater stream vary greatly, and the composition is complex, making treatment somewhat challenging.

Considering that the main pollutants in the wastewater are organic substances with a relatively high CODcr and good biodegradability, biological treatment methods are suitable. Therefore, the main process of "anaerobic UASB + aerobic ICEAS" has been determined

Serial Number	Monitoring Treatment Unit	CODc2/(mg·L-1)		BOD5/(mg·L-1)		SS/(mg·L-1)		pH
		Influent	Effluent	Influent	Effluent	Influent	Effluent	Influent	Effluent
1	Aeration Equalization Tank	5457	5020	1900	1805	355	355	5.24	5.65
2	Micro-electrolysis Reactor Neutralization Sedimentation Tank	5020	3263	1805	1354	355	178	5.67	6.89
3	UASB Anaerobic Reactor	3263	816	1354	270	178	125	6.89	7.25
4	ICEAS Biochemical Tank	816	122	270	27	125	88	7.25	7.34