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Biochemical pretreatment technology of high-hardness and high-salinity papermaking wastewater

A papermaking wastewater and biochemical treatment technology, which is applied in the direction of processing wastewater treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems of microbial cell membrane reverse osmosis, biochemical treatment system paralysis, microbial death, etc., and achieve the treatment effect Stable, reduced hardness and inorganic salt content, simple and easy process

Inactive Publication Date: 2016-10-26
东莞顺裕纸业有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the general biochemical treatment process at home and abroad has some disadvantages for the treatment of papermaking wastewater with high hardness and high salinity, mainly reflected in the trend of calcification / inorganization of anaerobic sludge and activated sludge, which leads to a decrease in the removal rate of organic matter, and the high salt content of wastewater causes The reverse osmosis of the microbial cell membrane causes the death of microorganisms and the paralysis of the biochemical treatment system, so it is necessary to improve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Embodiment, high hardness and high salinity papermaking wastewater biochemical treatment pretreatment process, comprises the following steps,

[0025] The physical and chemical step is to carry out physical and chemical treatment of the papermaking wastewater with high hardness and high salt content produced in the papermaking process; physical and chemical treatment is a common technology in the field of sewage treatment, and will not be repeated here. The hardness of the papermaking wastewater obtained after physical and chemical treatment is ≥800mg / l , Conductivity ≥ 4000us / cm.

[0026] In the conveying step, the papermaking wastewater after physical and chemical treatment enters the strong aeration tank by gravity.

[0027] In the strong aeration step, the strong aeration treatment is carried out through the jet aeration system controlled by frequency conversion and the misplaced perforated aeration tube installed in the strong aeration tank, and the jet aeration sy...

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PUM

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Abstract

The invention discloses a biochemical pretreatment technology of high-hardness and high-salinity papermaking wastewater. The biochemical pretreatment technology comprises a physicochemical treatment step, a conveying step, a strong aeration step, a precipitating step and a discharging step, wherein strong aeration is performed through a jet aeration system adopting variable frequency control and a staggered perforated aeration pipe which are arranged inside a strong aeration tank, so that the papermaking wastewater is fully mixed in the strong aeration tank. The biochemical pretreatment technology of the high-hardness and high-salinity papermaking wastewater, provided by the invention, is simple and feasible, and stable in treatment effect; by the biochemical pretreatment technology, the high-hardness and high-salinity papermaking wastewater can be effectively softened to improve water quality and reduce water hardness and inorganic salt content, so that a requirement on continuous and stable operation of a subsequent biochemical system is met; a whole process is clean and pollution-free, environment-friendly and energy-saving, and very low in running energy consumption and running cost.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment of sewage in the production of recycled paper and papermaking, in particular to a biochemical pretreatment process for papermaking wastewater with high hardness and high salt content. Background technique [0002] At present, in the recycled paper and papermaking industry, with the dual requirements of policy and economy, enterprises need to implement clean production, energy saving and emission reduction. With the increasing recycling rate of waste paper and papermaking white water, the concentration of pollutants in papermaking wastewater On the other hand, under the premise that the utilization rate of paper products is getting higher and higher, the specific requirements of the papermaking process must be met, and the amount of chemical additives must be increased in papermaking production, which will eventually lead to higher salinity and hardness in the production w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14F23G7/00C02F11/12
CPCC02F9/00C02F1/00C02F1/52C02F1/5245C02F1/66C02F3/00C02F2101/10C02F2103/28C02F2209/05C02F2209/055C02F2209/06F23G7/001
Inventor 张林生田锦明曾文智张琳刘志锋
Owner 东莞顺裕纸业有限公司
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