Industrial wastewater purification system for lithium battery

Abstract

The invention relates to an industrial wastewater purification system for a lithium battery. The system comprises an acid-base neutralization unit, a coagulation, flocculation and precipitation unit,a facultative membrane bioreaction unit, a lithium battery production wastewater storage tank, an alkaline wastewater storage tank, an acid wastewater storage tank and a domestic wastewater storage tank. According to the system, a mode of combining the acid-base neutralization unit, the coagulation, flocculation and precipitation unit and the facultative membrane bioreaction unit is adopted, so that the biodegradability of lithium battery wastewater is improved, and a process is simple and the cost is reduced; in addition, treatment of three kinds of wastewater produced by a lithium battery production enterprise is organically combined, so that the three kinds of wastewater can be treated at the same time, the process is simplified, repeated input of equipment and medicaments is reduced and the running cost is reduced; moreover, the acid-base neutralization unit in the system is only used for simple neutralization without any additional medicaments, then acid-base conditioning is performed on the lithium battery production wastewater by use of the remaining acid-base property of the neutralized wastewater and an acid-base conditioner is appropriately added, so that input of the equipment and the medicaments is reduced, and production procedures are also reduced.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a purification system for lithium battery industrial waste water. Background technique [0002] Lithium batteries are more and more widely used in daily life. As a relatively clean energy source, it has become an important product for the battery industry to develop. At present, there are three main types of wastewater generated by lithium battery production plants. The first category is wastewater containing acid and alkali generated during the regeneration of anion and cation resins, and the pollutants are mainly pH; the second category is wastewater generated from lithium battery production, turnover tanks, pipeline cleaning, etc., and this type of wastewater contains N - Methylpyrrolidone (NMP), polyvinylidene fluoride (PVDF), carbon powder and other refractory organic substances, as well as inorganic substances such as lithium iron phosphate, the wastewater discharge i...

AI Technical Summary

Problems solved by technology

The disadvantage of this treatment is that although this kind of wastewater is mainly pH pollution, it also contains certain inorganic or organic pollutants, which is easy to cause pollution if it is not treated, and the system needs to be adjusted by acid-base regulators, while in other wastewater treatment In the process, it is often necessary to use acid-base regulators to adjust at the beginning

Therefore, repeated input and repeated processes are generated, which increases the cost

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