Biochemical treatment process of nitrocotton acidic wastewater

A technology for biochemical treatment and acidic wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cost, low discharge compliance rate, low biochemical efficiency, etc. Achieve the effect of reducing operating costs, eliminating environmental pollution problems, and strong impact resistance

Inactive Publication Date: 2014-12-10
SICHUAN NITROCELLULOSE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the current treatment method has low biochemical efficiency, high cost, and low emission compliance rate

Method used

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  • Biochemical treatment process of nitrocotton acidic wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Embodiment 1 The biochemical treatment process of the nitrocellulose acid wastewater provided by the present invention operates within one month:

[0050] The nitrocellulose acid wastewater entering the treatment station first enters the regulating tank, the average COD is 454mg / L, the average acidity is 4.7g / L, and the average daily water volume is 3420m 3 After being neutralized by milk of lime (pH3.2-4.2), it enters the sedimentation tank and introduces neutral water at the same time. The average COD value of the sedimentation tank is measured to be 421mg / L, and the pH is 4.6-5.4 (lime will contain a small amount of calcium carbonate, carbonic acid Calcium participates in the neutralization of CO 2 , CO 2 Gradual release from water raises the pH; introduction of neutral water also raises the pH). Then use the pump to send water to the adsorption pool, and measure the pH of the adsorption pool to be 6.8 to 7.3 (the pH of the adsorption pool increases under the actio...

Embodiment 2

[0051] Embodiment 2 processing cost comparison

[0052] Calculated by treating 4,500 tons of wastewater per day:

[0053] The biochemical treatment process of nitrocellulose acid wastewater provided by the invention reduces the cost of PAC and PAM agents by 0.65 yuan / ton of wastewater. At the same time, the cost of medicament configuration, water and electricity consumption and facility repair and maintenance costs are reduced, and labor costs are reduced. It also reduces the chemical sludge produced by adding PAC and PAM agents, reducing the cost of this part of sludge treatment by 0.1 yuan / ton of wastewater. There is currently no good method for the disposal of chemical sludge, and the cost cannot be estimated.

[0054] The biochemical treatment process of nitrocellulose acid wastewater provided by the invention separates the neutral wastewater of the production line from the total wastewater, reduces the amount of acid water treatment, relatively increases the reaction ti...

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Abstract

The invention belongs to the field of wastewater treatment, in particular relates to a biochemical treatment process of nitrocotton acidic wastewater, and is used for solving the technical problems of low biochemical efficiency, high cost and low discharge standard of a treatment method at present. According to the technical scheme, the biochemical treatment process comprises the following steps: feeding the nitrocotton acidic wastewater into an adjusting tank, neutralizing in a neutralizing tank, settling in a settling tank, adding neutral wastewater, enabling the wastewater to flow to an adsorption tank, discharging the wastewater to a setting tank I together with active sludge water in the adsorption tank, enabling supernatant in the settling tank I to flow into an aerobic tank 1# for treatment, enabling the supernatant to flow into a settling tank II for settling together with active sludge water in the aerobic tank 1#, enabling supernatant in the settling tank II to flow into an aerobic tank 2# for treatment, settling in a settling tank III, and discharging. According to the biochemical treatment process, the overall biochemical treatment effect is remarkably improved and the operating cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a biochemical treatment process of nitrocellulose acid waste water. technical background [0002] At present, the process flow of biochemical treatment of nitrocellulose acidic wastewater is: waste water→adjustment tank→neutralization reaction tank→sedimentation tank→adsorption tank→primary sedimentation tank→anaerobic tank→1# aerobic tank→secondary sedimentation tank→2# aerobic pool→coagulation reaction tank→tertiary sedimentation tank→discharge. After the wastewater containing sulfuric acid and nitric acid is neutralized by milk of lime, the concentration of calcium sulfate contained in the water is high, which will lead to the rapid calcification of sludge in the biochemical system, and the basic failure of anaerobic sludge calcification. In order to alleviate the calcification problem, an adsorption treatment unit is added, and the sludge of the coagulation s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 冯成运薛军政
Owner SICHUAN NITROCELLULOSE CORP
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