Biologically-enhanced treatment process for wastewater produced in lithium battery production

Abstract

The invention belongs to the technical field of wastewater treatment, and discloses a biological-enhanced treatment process for wastewater produced in lithium battery production. The process comprisesthe following steps: 1) introducing the wastewater into a hydrolytic acidification tank, and adding an Enterobacter sp.NJUST50 strain and activated sludge into the hydrolytic acidification tank for hydrolytic acidification treatment, wherein the accession number of the strain is CCTCC No. M2019128; 2) introducing effluent into an anoxic reaction tank, and adding Enterobacter sp. NJUST50 and anaerobic activated sludge for anoxic reaction treatment; 3) introducing effluent into an aerobic reaction tank, and adding Enterobacter sp. NJUST50 and aerobic activated sludge for aerobic treatment; 4) introducing effluent into an anoxic filter tank, and adding Enterobacter sp. NJUST50 and anaerobic activated sludge into the filter tank for treatment; and 5) introducing effluent into a biological aerated filter, and adding a sludge mixture of Enterobacter sp.NJUST50 and aerobic activated sludge into the filter for treatment. According to the combined treatment method provided by the invention, efficient biodegradation is realized, cost is effectively reduced, and system stability is improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a biointensified treatment process for lithium battery production wastewater. Background technique [0002] As a relatively clean and rechargeable new energy source, lithium battery has the characteristics of high capacity density and energy density. It has become the power battery with the most development potential and is widely used in various industries. At present, the wastewater produced by lithium battery manufacturers is mainly cathode and anode cleaning wastewater. The main pollution factors are nitrogen-methylpyrrolidone (NMP), lithium cobaltate, carbon powder, and glue-like substances, with complex components and poor biodegradability. The characteristic pollutant nitrogen methyl pyrrolidone belongs to the nitrogen heterocyclic compound, the structure is highly stable, not easy to biodegrade and has strong biological toxicity. Once the untreated lithium bat...

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Problems solved by technology

[0009] In view of the high concentration of nitrogen methyl pyrrolidone, total nitrogen and refractory pollutants in lithium battery production wastewater, it is difficult to effectively remove the problem. The existing methods for treating lithium battery production wastewater have high costs and unstable systems. Difficult to large-scale application, the present invention provides a mixture of Enterobacter sp.NJUST50 strains and activated sludge for hydrolytic acidification, primary anoxic, aerobic treatment, secondary anoxic filter, biological aerated filter depth treatment, effectively reduce costs and improve system stability while achieving efficient biodegradation

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