At present, the treatment technologies for lithium battery production wastewater mainly use physical and chemical methods, chemical oxidation and decomposition, electrochemical methods, activated carbon adsorption, reverse osmosis, and evaporation methods. However, these methods are relatively expensive and require high operators, making achieving stable wastewater discharge up to standards or zero discharge difficult.
Xiner Environmental has been focusing on recycling lithium resources since 2020, especially the combination of wastewater treatment and lithium resource recycling, forming a characteristic path of "recycling lithium to treat water."
Three main methods to recycle wastewater:
1. Recycle useful materials from wastewater, Such as high-value metals Li, Ni, Au, Ag, Cu, and other materials; there are several main ways to recycle: ①. Recycle in the form of high-concentration waste liquid; ②Recycle in the form of certain ionic crystals; ③Recycle in the form of sludge.
2 . Recycle wastewater into reclaimed water, recycle water resources, and save water.
3. Recycle useful resources from wastewater, such as biogas energy, system high-pressure energy recovery, and recycling of some chemicals. Wastewater treatment can transform its role from consumption to output, which is of great significance.
Our Solutions：
1. In first-level recycling, after pretreatment, iron phosphate, lithium iron phosphate, and ternary lithium solid materials can be recovered without introducing new impurities to ensure their purity.
2. Carry out secondary and tertiary wastewater treatment and recover high-concentration lithium waste liquid by UF+RO+resin/electrodialysis, respectively.
3. Conduct secondary treatment and purification of high-concentration lithium waste liquid and then recycle it.
Core processes: DTRO, MBR evaporation, desalination (electrodialysis system, RO system)
Compliance with emission standards: regulating system, physical and chemical pretreatment system, biochemical system, MBR system, ion exchange
Water reuse: regulating system, filtration system, coagulation and flocculation, evaporation system, ceramic membrane, biochemistry, air flotation, RO, ultrafiltration
Zero emissions: regulating system, physical and chemical pretreatment system, biochemical system, MBR system, ion exchange, ultrafiltration, reverse osmosis, evaporation
Our implementation：
COD: 500-600 ppm, TDS: 150000ppm,
F: 3000-3500 ppm, TN: 15ppm;
Processing technology:
Pretreatment + high-salt biochemistry + ozone oxidation + secondary biochemistry;
Water situation:
1. The single-stage COD removal rate in the high-salt biochemical section reaches more than 65%;
2. Effluent COD＜60 ppm, F-＜10 ppm;
