Method for deeply treating papermaking wastewater

Abstract

The invention relates to a method for deeply treating papermaking wastewater. The invention comprises the following steps: conducting anaerobic treatment, facultative treatment and aerobic treatment to papermaking waste water which reaches standard after alkali recovery and middle part water treatment and is distributed in a multistage oxidation pond treatment unit through manual redeploy; and leading the treated water to a manual ground bed with certain area, certain gradient and certain size designed according to treatment load requirements by a corresponding drainage and irrigation system after the water achieves primary treatment effect. the invention establishes a typical model of 'lagoon-constructed wetlands', creates a new technique of papermaking waste water ecologic treatment bases on low power consumption, low cost and high elimination rate, and enables that large amount of rough purified middle part papermaking waste water of papermaking enterprises after alkali recovery and middle part water treatment truly realizes the aims of safe and efficient treatment and resource cyclic utilization.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a method for advanced treatment of papermaking sewage. Background technique [0002] At present, there are three main technical routes for the advanced treatment of papermaking wastewater at home and abroad: one is strong oxidation decolorization, the other is large doses of coagulation and flocculation agents, and the third is activated carbon adsorption. According to the results of the survey, the effects of the above three methods are very unsatisfactory. Taking China Metallurgical Yinhe in Shandong Province as an example, the plant adopts the method of adding large doses of coagulation and flocculation agents. In order to try its best to meet the new national standards, the dosage is continuously increased, which not only increases the cost of sewage treatment per ton to more than 4 yuan , and the amount of sludge generated has doubled (converted from drugs) and has...

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Problems solved by technology

However, after this life cycle is exceeded, the activated carbon system will fail due to adsorption saturation and failure to acidify and regenerate in time, and the treatment effect will drop sharply. Compared with the chemical addition method, this method not only has a shorter life span but also has higher treatment costs, so it is not an ideal process path.

Strong oxidation decolorization adopts the method of acid analysis, which not only has high treatment costs, serious secondary pollution, occupies a large area of ​​land, but also limits the amount of sewage to be treated, and has no development prospects

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