Regenerated papermaking wastewater treatment system

Abstract

The invention discloses a regenerated papermaking wastewater treatment system. The regenerated papermaking wastewater treatment system comprises an inclined screen, a primary settling tank, a reinforcing tank, a secondary settling tank, an air floatation tank, a filter, a sludge thickener, a sludge anaerobic digester and a filter press. The inclined screen, the primary settling tank, the reinforcing tank, the secondary settling tank and the air floatation tank are sequentially connected through pipelines. The sludge thickener and the sludge anaerobic digester are sequentially connected through a pipeline. The reinforcing tank comprises an acid water dissolution tank and an oxygen tank. The filter is arranged between the air floatation tank and the sludge thickener. The filter press is connected with the sludge anaerobic digester. A large number of clean and impurity-free hot water working media can be recycled, water temperature is high, the hot water working media can be directly fed into a boiler to be recycled without chemical water treatment, therefore, production cost is reduced, and the purposes of saving energy and reducing consumption are achieved.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a waste paper and papermaking wastewater treatment system. Background technique [0002] The wastewater discharged by papermaking enterprises mainly contains pollutants such as hemicellulose, lignin, inorganic salts, fine fibers, starch, titanium dioxide, ink, and fuel. Lignin, hemicellulose, starch, etc. mainly form CODcr, BOD5 and suspended solids in wastewater; fine fibers mainly form suspended solids. The pollution load of production wastewater discharged from waste paper and papermaking is relatively high, but the BOD5 value is low, so the biodegradability is poor. However, since insoluble CODcr usually accounts for most of the COD composition in this type of wastewater, when the suspended matter in the wastewater is removed, most of the insoluble CODcr is also removed at the same time. Therefore, for this kind of wastewater, the pretreatment of wastewater should be st...

AI Technical Summary

Problems solved by technology

At the same time, in order to reduce pollution and save power consumption, the current papermaking workshop has established a white water circulation system. The water consumption of the system has been greatly reduced and the degree of closed circulation of papermaking white water has been improved, so that these soluble substances accumulate in the system. As a result, the soluble COD in the wastewater gradually increased, and the treatment of papermaking wastewater became more difficult.

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