Paper mill wheat straw slurry black liquor treatment system

Abstract

The invention discloses a paper mill wheat straw slurry black liquor treatment system which comprises a filter tank, a pre-sedimentation tank, an acid precipitation lignin tank, a sludge drying bed, a neutralization tank, a secondary filter tank, a heating tank and an anaerobic tank, wherein the filter tank is sequentially connected with the pre-sedimentation tank, acid precipitation lignin tank, neutralization tank, secondary filter tank, heating tank and anaerobic tank; the outlet ends of the neutralization tank and pre-sedimentation tank are respectively connected to the sludge drying bed through pipelines; baffle structures are adopted among the filter tank, pre-sedimentation tank, acid precipitation lignin tank, neutralization tank, secondary filter tank, heating tank and anaerobic tank, and the top of each tank is sealed with a steel plate; the upper part of the filter tank is provided with a water inlet; and the middle part of the bottom of the heating tank is provided with a water outlet. The paper mill wheat straw slurry black liquor treatment system is in the completely closed state in the treatment process to prevent other harmful reactions in the tanks. The system has the advantages of low manufacturing cost and favorable treatment effect, and completely satisfies the requirements for paper mill black liquor treatment.

Description

technical field [0001] The invention relates to hazardous waste treatment, in particular to a wheat straw pulp black liquor treatment system in a paper mill. Background technique [0002] Paper mills discharge three streams of water according to the process, one is pulping and cooking waste liquid, commonly known as papermaking black liquor; It can be reused after processing. The middle stage water is the remaining part of incomplete extraction of black liquor and should account for less than 10% of the total amount. The pollutants contained in the black liquor account for more than 90% of the total pollution discharge of the whole plant. Therefore, black liquor discharge is the main source of pollution in paper mills. [0003] Black liquor contains a large amount of suspended solids, organic pollutants and toxic substances, and direct discharge into water bodies will cause serious pollution. The main hazards are: the papermaking wastewater containing a large amount of f...

AI Technical Summary

Problems solved by technology

[0003] Black liquor contains a large amount of suspended solids, organic pollutants and toxic substances, and direct discharge into water bodies will cause serious pollution

The main hazards are: the papermaking wastewater containing a large amount of fibers, pigments and inorganic salts will turn the water black and have a special stench, and the large amount of alkaline substances in the black liquor will sharply increase the pH of the water and damage The balance of the water environment