Method for treating firecracker paper making wastewater

Abstract

The invention discloses a method for treating firecracker paper making wastewater. The method comprises the following steps: inputting the firecracker paper making wastewater into an adjusting pond, a pretreatment reaction settling pond, an anaerobic pond, an aerobic pond, a biochemical settling pond, a deep treatment primary reaction settling pond, an oxidation reaction pond and a deep treatment secondary reaction settling pond in sequence, wherein ferrous sulfate is added into the water inlet end of the adjusting pond; lime, PAC (poly aluminum chloride) and PAM (polyacrylamide) are added into the oxidation reaction pond; concentrated sulfuric acid and ferrous sulfate are added into the deep treatment primary reaction settling pond; hydrogen peroxide is added into the oxidation reaction pond; NaOH, PAC and PAM are added into the deep treatment secondary reaction settling pond. According to the method, the concentration of organic pollutants and organic dyes (especially rhodamine) in the firecracker paper making wastewater is remarkably reduced, and the indexes of the wastewater can meet the standards; moreover, a test shows that in two years for running engineering application, the running parameters of a process at each stage are stable, and a system is strong in adaptability to water concentration fluctuation and external temperature change.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for treating fire bamboo paper papermaking waste water. Background technique [0002] At present, the papermaking of firecracker paper generally uses fine wood powder, bamboo pulp (raw pulp made from caustic soda or lime), and waste paper as raw materials. The ratio of the three raw materials is about one-third each. After the raw materials are mixed and pulped, dyes such as alkaline rhodamine, bright red, and acid orange red II are added to the pulp, and red rose essence paper is obtained after drying or drying. At present, the manufacturers are mainly concentrated in Hunan, Guangxi, Jiangxi, etc. It belongs to the papermaking of part raw pulp and part recycled paper. Due to the large amount of red wastewater produced in the production process of firecracker paper, the concentration of organic matter is high, and it is difficult to decolorize. The CODcr of the was...

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Problems solved by technology

However, none of the above process combinations can make all the indicators of wastewater meet the requirements of the discharge standard, and after about 3-4 months of operation, the biochemical system will be unstable or even paralyzed, and the biochemical effluent will deteriorate.

[0004] The main disadvantages of the above process are: (1) pretreatment cannot effectively remove substances such as organic dyes dissolved in water, and the concentration of pollutants is still very high (COD cr up to 7500-9000mg / L), causing a great burden on the subsequent biochemical treatment

(2) High concentration of sulfate ions in wastewater will affect the anaerobic system, and in severe cases, the anaerobic system will be paralyzed

(3) The concentration of organic pollutants in the effluent in the biochemical treatment stage is high, and direct oxidation, coagulation or adsorption cannot make the wastewater treatment reach the standard

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