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Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method

A viscose fiber, biochemical treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of reducing the consumption of raw materials and reducing the load

Inactive Publication Date: 2012-07-25
ZHEJIANG DONGFA ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the incomplete treatment of comprehensive wastewater after the acid wastewater and alkaline wastewater in the viscose industry are mixed, and the Zn in the wastewater 2+ 、COD cr and chromaticity to remove substandard phenomena, the proposed combined treatment process of creative physicochemical method and biochemical method

Method used

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  • Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method
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  • Biochemical treatment technology for viscose waste water with physico-chemical method and CASS (Cyclic Activated Sludge System) method

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Experimental program
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Effect test

Embodiment 1

[0030]

[0031] The viscose production process workshop mainly discharges acidic wastewater and alkaline wastewater. Under normal production process conditions, the volume of acidic wastewater is twice that of alkaline wastewater. Acidic wastewater mainly contains H 2 SO 4 , ZnSO 4 and Na 2 SO 4 , using the following acid wastewater measurements: pH 1.2, COD cr 390mg / L, Zn 2+ 70mg / L, suspended matter 480mg / L. Alkaline wastewater mainly contains NaOH, Na 2 S, CS 2 and cellulose xanthate, using the following measurements for alkaline wastewater: pH 12, COD cr 2350mg / L, suspended matter 150mg / L. After acidic wastewater and alkaline wastewater are mixed at a volume ratio of 2:1, the following measured values ​​are used: pH value 2.6, COD cr 1050mg / L, Zn 2+ 50mg / L, suspended matter 410mg / L. According to the corresponding first-level discharge standard in GB8978-96, control the effluent indicators after treatment: pH value 6-9, COD cr 2+ <2mg / L, suspended matter <70m...

Embodiment 2

[0033]

[0034] When the pH value is 2.7, after 1.5 hours of hydraulic retention acidification, the cellulose sulfonate in the wastewater will be decomposed into gaseous substances and other organic substances that are easily degraded by the CASS method. off, CS in wastewater 2 、H 2 A large amount of S will be precipitated on the water surface, which can reduce the COD in the water cr, chromaticity, and at the same time fully mixed acidic wastewater and alkaline wastewater. Add lime slurry to neutralize the lime slurry. After 0.5 hours of hydraulic retention, the pH value of the final effluent is 9.5, reaching Zn 2+ Form Zn(OH) 2 Theoretical conditions for precipitation (main). By adding 800L / h of 10% flocculant solution and 200L / h of 0.5% coagulant aid solution to the lime slurry and the terminal effluent, through hydraulic self-mixing, the suspended solids in the wastewater are accelerated to form flocs and precipitate, and the flocculation and precipitation process 4...

Embodiment 3

[0036]

[0037] When the pH value is 2.1, after 2 hours of hydraulic retention acidification, the cellulose sulfonate in the wastewater will be decomposed into gaseous substances and other organic substances that are easily degraded by the CASS method. off, CS in wastewater 2 、H 2 A large amount of S will be precipitated on the water surface, which can reduce the COD in the water cr , chromaticity, and at the same time fully mixed acidic wastewater and alkaline wastewater. Add lime slurry to neutralize the lime slurry. After 1 hour of hydraulic retention, the pH value of the final effluent is 9.8, reaching Zn 2+ Form Zn(OH) 2 Theoretical conditions for precipitation (main). By adding 600L / h of 12.5% ​​flocculant solution and 150L / h of 1% coagulant aid solution to the lime slurry and the terminal effluent, through hydraulic self-mixing, the suspended solids in the wastewater are accelerated to form floc precipitation, and the flocculation precipitation process is 4.5 Af...

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Abstract

The invention discloses a biochemical treatment technology for viscose waste water with a physico-chemical method and a CASS (Cyclic Activated Sludge System) method, which belongs to the field of the water environment protection and particularly relates to the materialized and biochemical combined treatment technology of acid and alkaline waste water in the viscose industry. The biochemical treatment technology is mainly used for solving the phenomenon that the Zn2<+>, CODcr (chemical oxygen demand) and chroma removal of the viscose waste water is substandard. In the biochemical treatment technology, the flow process comprises acidification analytic stripping, a neutral reaction, flocculation sedimentation and CASS pool biochemistry; CODcr and chroma are lowered by the acidification analytic stripping, and CS2 and H2S gas are precipitated; 10-15% of lime slurry is added for neutralization; a pH value is regulated to 9-10; flocculant and coagulant aid are added; Zn2<+> ions and most suspended matters are removed by the flocculation sedimentation; effluent processed with the physico-chemical method enters a CASS pool biochemical period; and supernate is discharged after the treatment of feeding water for 2-3 hours, aerating for 6-7 hours, precipitating for 0.5-1 hour, draining water for 2-2.5 hours and leaving unused for 0.5-1 hour. The biochemical treatment technology is mainly used for the comprehensive standard discharge treatment for the acid and alkaline waste water in the viscose industry.

Description

technical field [0001] The invention belongs to the field of water environment protection, and in particular relates to a process for combining acidic and alkaline waste water in a process workshop of the viscose industry with a combination of physical and chemical methods and biochemical methods. Background technique [0002] The craft workshop of the viscose industry will discharge a large amount of acidic wastewater (mainly containing H 2 SO 4 , ZnSO 4 、Na 2 SO 4 , whose COD cr Around 400mg / L) and alkaline wastewater (mainly containing NaOH, Na 2 S, CS 2 , cellulose xanthate, its COD cr at about 2300mg / L), and the amount of acidic wastewater is about twice the amount of alkaline wastewater (volume ratio), the main pollution factor of mixed wastewater is COD cr , pH value, Zn 2+ , chroma, suspended matter. Conventional treatment methods are more effective in neutralizing the pH value of wastewater and removing suspended solids, but Zn in acid-base mixed wastewate...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 张学富韩东浩钱震一郭宇锋周辉杨欢天黄利波王利震范冰锹
Owner ZHEJIANG DONGFA ENVIRONMENTAL PROTECTION ENG
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