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

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...

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