Basic Process of Sewage Treatment in Pulp and Paper Industry

Abstract

The invention discloses a sewage treatment foundation technology of the pulping and papermaking industry. The sewage treatment foundation technology comprises the steps of front auxiliary, a first-stage sewage treatment core technology, middle auxiliary, second-stage sewage treatment core technology and rear auxiliary; in the whole technology process, controlling is performed on the basis of pH values of a water body at all technological points, and various parameters can be set according to the requirements of feed water and yielding water indexes. According to the sewage treatment foundation technology of the pulping and papermaking industry, it can be guaranteed that an ion fractionation medicament has the following representative characteristics and advantages in practical application that the dosage is little (10-300 g per ton of water), the medicaments are directly dosed in a solid state without needing to be diluted, sewage is treated in real time without storage (the reaction time is 3-15 minutes), and the removing rate of water body contents is more than 80%; in addition, the national various sewage treatment discharge indexes are followed and met, treated water is colorless and free of abnormal odor and secondary harmful chemical substances, and sludge generated through flocculation is low in water content (smaller than 35%), odorless, not sticky and the like.

Description

technical field [0001] The invention relates to a process and method in the field of sewage treatment, and is embodied in a basic process and method for sewage treatment in the pulp and paper industry. Background technique [0002] In recent years, with the development of population and economy, environmental problems have become increasingly serious, and our government and people have attached great importance to them. Among them, the problem of water pollution has become a more important problem among many environmental problems. Water pollution causes soil pollution, which in turn causes air pollution and destroys the overall ecological environment. The main sources of water pollution are domestic sewage and industrial sewage, among which industrial sewage bears the brunt, and pulping and papermaking wastewater is one of the key industrial wastewater, which is large in volume and harmful to the human body and the environment. [0003] The so-called pulp and paper industr...

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Problems solved by technology

[0008] At present, pulp and paper wastewater treatment mainly uses three technical methods: physical method, chemical method and biological method; among them, physical method includes various filtration, and the operation and maintenance cost of membrane technology is quite expensive; while chemical method usually involves adding high Molecular oxidants (iron oxide, Fenton, etc.) and chemical flocculants (such as polyacrylamide (PAM) or polyaluminum chloride (PAC)); however, chemical flocculants have a large dosage, good water dilution and The shortcomings of proportioning, long-term static precipitation, non-stirring, generation of secondary chemical hazardous substances and high water content of sludge inevitably have relatively large problems in actual process and operation; such as slow flocculation speed, water buffer and The reaction supporting facilities occupy a large area, the waste of water resources and land is relatively serious, and cause secondary pollution to the water environment. It takes a lot of electric energy to drive the sludge filter press or centrifuge, and the sludge smells very smelly, and the moisture content of the treated sludge is still as high as 60% or more

Biochemical methods are currently widely used, especially in domestic sewage treatment. Its advantages are stability, effectiveness, and low operating costs, but its limitation is that it cannot treat waste water with high concentrations of organic matter and high salt and other poor biodegradability. It is very difficult to domesticate and cultivate bacteria, and even some chemical wastewater can kill biochemically active bacteria; this is the reason why our country’s urban sewage treatment plants are still powerless against landfill leachate and industrial wastewater despite their large scale

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