Papermaking pulping black liquor treatment system

Abstract

The invention relates to a papermaking wastewater treatment system. The system comprises a papermaking pulping black liquor collecting system, an acid separation treatment tank, a neutralization tank, a neutralization and precipitation tank, a homogenizing tank, an upflow anaerobic sludge blanket (UASB), a biochemical tank, a comprehensive adjusting tank, a precipitation tank, an A / O biochemical tank, a secondary precipitation tank, a third precipitation tank and a sewage discharging system. The system has the following advantages: through biochemical-UASB reactor-A / O method three-stage treatment, a very high treatment effect is achieved, the effluent is very stable and the impact resistance is high; 2, compared with the traditional activated sludge method (SBR method), the system is capable of saving investment cost by 20% and saving operation cost by 25% or above; 3, the aeration equipment used in the process is the most advanced microporous aeration equipment; compared with surface aeration and jet processes, the process adopted in the invention has the advantages that the oxygen conversion rate is improved by 10-15%, power consumption and operation cost can be reduced greatly, and the operation efficiency is improved; and 4, the system has obvious superiority when used for treating wastewater with relatively high concentration.

Description

technical field [0001] The invention relates to a papermaking wastewater treatment system. Background technique [0002] Production of long-fiber pulp as the leading product and products such as paper for electrolytic capacitors and aluminum foil paper. The raw material of long-fiber pulp is produced by chemical pulping of sisal raw materials. During the production process, a large amount of black liquor, mid-stage wastewater and other high-concentration organic pollutants are produced. . Black liquor concentration CODcr: 13000-20000mg / l, NH3-N concentration 350mg / l, if not treated, it will not only pollute the environment, but also not meet the national "Pulp and Paper Industry Water Pollutant Discharge Standard" (GB3544-2008) table 2 Standard limits for pulping production. Protecting the environment and preventing pollution is an inevitable trend and requirement for the sustainable development of the pulp and paper industry. In my country, there are very few pulping comp...

AI Technical Summary

Problems solved by technology

The selection of equipment is backward, so that the wastewater treatment station cannot run smoothly, resulting in the discharge of sewage treatment sometimes exceeding the standard

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