Method for comprehensive treatment of wastewater and sludge gas utilization of cane sugar factory

Abstract

The invention discloses a method for treating cane sugar factory wastewater comprehensively and using methane, which comprises the following steps: removing fibers and depositing coarse dregs in pretreated bagasse spray water, bagasse washing water, lime sludge filtered water, part of cooling water, papermaking alkaline wastewater, alkali reclaiming vaporization condensation water, and part of paper machine wastewater after reclaiming white slime of a cane sugar factory; mixing and properly heating all the water and delivering the mixture into an anaerobic reactor to perform anaerobic reaction; desulfurizing, decarburizing, purifying, filtering and compressing the obtained methane, and using the methane for heating a paper machine; and performing aerobic biochemical treatment on the sewage generated by the reaction in the anaerobic reactor so that the sewage reaches the discharge standard and is discharged, wherein sludge can be applied to preparing an organic compound fertilizer. The method can treat the sewage of the cane sugar factory comprehensively, can reclaim part of energy generated in the process of the wastewater treatment and apply the energy to production, thereby greatly reducing the production cost and bringing about better economic benefits and social benefits.

Description

technical field [0001] The invention relates to a method for comprehensive treatment and utilization of waste water, in particular to a method for comprehensive treatment of waste water from sugar cane sugar factories and papermaking and utilization of methane. Background technique [0002] In recent years, my country's sugar and paper production has grown and expanded year by year, creating rich material wealth for the society, but also polluting the environment. Filter mud, alcohol waste liquid, coal cinder, sulfur dioxide-containing flue gas, etc. discharged from sugar production all cause environmental pollution. The black liquor discharged from papermaking, the middle-stage alkaline wastewater, and the white water after papermaking also pollute the environment, thereby restricting the development of production. Through the efforts of many people in the past few years, the degree of pollution has been reduced a lot, but the distance from clean There is still a long way ...

AI Technical Summary

Problems solved by technology

In addition, the black liquor, mid-stage alkaline wastewater, papermaking white water, etc. discharged from papermaking production, in addition to concentrating and burning the black liquor in some paper mills, and adopting sedimentation treatment for papermaking white water, the middle-stage alkaline wastewater has no treatment method. mixed with other wastewater

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