Waste-liquid treatment method for straw pulp paper-making

Abstract

The invention relates to a sewage treatment method for straw pulp papermaking. In order to solve the shortcomings of high operating cost and incomplete extraction of black liquor in the prior art, a sewage treatment method with low operating cost and capable of meeting discharge standards is provided. Including sending straw pulp papermaking raw materials into steaming balls for cooking to make raw pulp; the raw pulp is extracted through extrusion equipment three times to extract black liquor; the raw pulp that has extracted black liquor is sent to the pulping process for pulping, and the output The white water collects pulp fibers through an inclined mesh filter device, and the filtered white water enters a sump; adding flocculant to the sump, pumping it into the ultra-efficient shallow air flotation device through a pump, and simultaneously aerating and adding a coagulant; The scum collected by the effective shallow air flotation device, the scum is stirred into the sludge tank through the pulp thickening tank and the pulp tank, and the remaining clear water can be directly discharged or reused. The method has the advantages of high extraction rate of papermaking black liquor, small investment in middle stage water treatment, low operation cost of the whole technological process, thorough treatment, and stable discharge up to standard.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a sewage treatment method for straw pulp papermaking. Background technique [0002] The paper industry is one of the industries that pollutes the environment more seriously, and its main pollution comes from various waste water produced in the pulping and papermaking process. [0003] Various manufacturers at home and abroad have adopted different measures for the treatment of pulp and paper pollution. According to the survey, they are thoroughly treated and meet environmental protection requirements. But the most important thing is the main reason why the paper-making enterprises cannot run normally and stably due to the high cost of treatment and operation, which leads to the unstable discharge of wastewater. Contents of the invention [0004] The purpose of the present invention is to provide a sewage treatment method with low operation cost and discharge up to standard. [00...

AI Technical Summary

Problems solved by technology

But the most important thing is that due to the high cost of treatment and operation, the paper-making enterprises cannot operate normally and stably, which leads to the main reason why the wastewater cannot be discharged stably.

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