A papermaking wastewater advanced treatment device

Abstract

A deep-treatment device for papermaking wastewater is disclosed. The deep-treatment device comprises a first-stage physicochemical treatment device, a second-stage biochemical treatment device, a coagulative precipitation tank and a microfiltration. The deep-treatment device is characterized in that the deep-treatment device also comprises a central control unit, a wastewater buffer tank, a composite biological flocculant buffer tank, a biological flocculant buffer tank, a first wastewater flowmeter, a second wastewater flowmeter, a mixing pipeline and a stirring tank, and the deep-treatment device is simple in structure, low in cost, and capable of effectively further treating the wastewater after two-stage treatment, thus increasing the reuse rate of raw materials, lowering the production cost, further reducing COD and chromaticity of discharged water, and protecting the environment and human health.

Description

technical field [0001] The invention belongs to the technical field of papermaking wastewater treatment, in particular to a papermaking wastewater advanced treatment device. Background technique [0002] At present, the unreasonable raw material structure and scale structure of my country's paper industry, coupled with the low level of technical equipment, has led to a high consumption ratio of water, energy, and materials in my country's paper industry, and has produced a large number of water pollution sources. The pressure of environmental protection is huge, and the task of pollution prevention and control is very arduous. [0003] A lot of water is used in the papermaking process, and the production of 1 ton of paper requires about 300-500m of water 3 , in the papermaking wastewater, not only contains a large amount of papermaking raw materials (about 20% of the raw materials are lost with the wastewater), but also contains a large amount of chemicals and other impuriti...

AI Technical Summary

Problems solved by technology

[0012] 4) Toxic substances: abietic acid and unsaturated fatty acids contained in black liquor

After the previous biochemical treatment, most of the residual toxic and harmful substances in the effluent after the secondary treatment are toxic and harmful substances that are difficult to biodegrade, and they are discharged into the water body, which will bring potential harm to the environment.

Images