3.3. Soybean wastewater pretreatment
Coagulation and biological methods were always used as pretreatment in traditional PSB wastewater treatment. However, pretreatment increases cost, consumes organics and generates hazardous sludge, which might be avoided by using Z08 to directly treat the wastewater. In order to further clarify the issue of pretreatment, both coagulation and yeast degradation were examined as pretreatment methods.