The sustainability of a lithium battery manufacturing plant depends on whether the final effluent meets discharge standards.This project,located in Jiangxi Province,involved the treatment of 300 m3/d of wastewater,with a design capacity of 370 m3/d.The wastewater from the triple soft-pack lithium battery manufacturing process primarily consisted of production wastewater from positive and negative electrodes and cell disassembly.It was characterized by high COD concentrations,low biodegradability,and the presence of fluoride and heavy metals(Ni,Mn,Co).The treatment process involved two stages:initial coagulation and anaerobic treatment,followed by mixing with other wastewater streams and further treatment through contact oxidation and a membrane bioreactor(MBR).The quality of the final effluent exceeded the emission standards set by the"Pollutants Emission Standards for the Battery Industry Wastewater"(GB30484-2013)in Table 2 of the indirect emission quality standards.An innovative zwitterionic flat ceramic membrane,with higher hydrophilicity and a higher L/day per m2(LMH)and lower chemical cleaning frequency,was used in the submerged MBR system.The water treatment cost was estimated at only 5.7 Yuan/m3.
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