Papermaking industry is one of the six big international industrial pollution sources, accounts for some 10% of the total amount of waste water of China's industry.
Primary wastewater treatment in pulp and papermaking industry for high concentration organic wastewater, and containing lignin, the residual alkali, sulfide, chloride and other pollutants.
Characterized by a large amount of waste water, COD concentration is high, the waste water in the fiber suspension, and containing the bivalent sulfur, high colority, mercaptan kind bad odor.
First three sources: papermaking wastewater pulping waste liquor (
, ZhongDuanShui, paper machine white water.
Papermaking wastewater can bring serious pollution to the surrounding water and the destruction of the ecological environment.
According to statistical data in recent years is introduced, the pulp and paper industry wastewater emissions accounted for about 10% ~ 12% of the total national sewage discharge, the third;
Discharge of the chemical oxygen consumption (
About 40% of the national emissions -
45%, putting it in place.
Serious pollution and damage the papermaking wastewater has attracted widespread attention.
Along with the people environmental protection knowledge, thoroughly solve the papermaking wastewater pollution to the environment is imminent.
In the pulping (
And paper produced first occurred in the process of three kinds of wastewater: black (
Liquid, middle waste water and paper machine white water.
Liquid first is cooking pulping wastewater, ZhongDuanShui contains pulp washing, selecting and bleaching waste water, waste paper machine white water for writing workshop.
Cooking wastewater during the environmental pollution is serious, accounted for 90% of the entire paper industry pollution.
Is the first ingredient of black liquor lignin, cellulose, hemicellulose, and simple sugars, organic acids, sodium hydroxide, etc. , can be summarized to recover their useful substance;
Middle wastewater pollutants, contains a high concentration of lignin, cellulose and resin acid salt and so on are difficult to biodegradable material composition, and rich in bleaching stage of damage to the environment of organic chloride, with deep color and great toxicity, pH is 9 ~ 11, suspended matter about 1000 mg/l, COD600 -
Dipping paper waste water, also called 'white water', first from beating, purification of the thick liquid material selection and paper machine wet end.
Primary pollutants containing suspended solids in the wastewater, such as fibers, fillers, coating, and the dissolution of wood components, increase the wet strength agent, preservative, etc.
Paper industry of industrial wastewater pollution to the environment is very big, about to deal with industrial waste water from all walks of life for them is very big.
To deal with industrial waste water is very important.
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