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Process of treating acetic acid producing effluent and papermaking waste water comprehensively

A technology for papermaking wastewater and production wastewater, which can be used in processing wastewater treatment, food industry wastewater treatment, flotation water/sewage treatment, etc., and can solve the problems of high silicon content, low calorific value, and many hemifibers and heterocells.

Active Publication Date: 2009-03-11
张立省
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Wheat straw pulp black liquor still has some problems in the alkali recovery process due to its low calorific value, high viscosity, high silicon content, many semi-fibers and miscellaneous cells, and easy deterioration and precipitation.

Method used

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  • Process of treating acetic acid producing effluent and papermaking waste water comprehensively

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Experimental program
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Effect test

Embodiment 1

[0041] Embodiment 1: Comprehensive treatment of acetic acid production wastewater and papermaking wastewater

[0042] 1. Mix the acetic acid production wastewater with a pH of 3 to 5 and the papermaking wastewater with a pH of 11 to 12 in a volume ratio of 4: (5 to 6), so that the pH of the mixed solution is 6.5 ± 0.2, and the papermaking wastewater is a pulp washer Extracted wheat straw pulp black liquor;

[0043]2. Add the above-mentioned mixed solution to the primary anaerobic effluent of 2-3 times the volume of alcohol waste water for anaerobic fermentation according to the feed load of 0.5-0.6% (volume ratio). One anaerobic effluent, the fermentation temperature is 58±1°C, and the fermentation time is 11.5 days.

[0044] 3. After cooling and clarifying the above fermentation liquid, put the supernatant liquid into another container for secondary anaerobic fermentation, the fermentation temperature is 37±1°C, and the fermentation time is 55 hours;

[0045] 4. The superna...

Embodiment 2

[0047] Embodiment 2: Comprehensive treatment of acetic acid production wastewater and papermaking wastewater (mixed solution plus distiller's grains)

[0048] 1. Mix the acetic acid production wastewater with a pH of 3 to 5 and the papermaking wastewater with a pH of 11 to 12 in a volume ratio of 4:6, so that the pH of the mixed solution is 6.5±0.2. The papermaking wastewater is wheat straw extracted from a pulp washer pulp black liquor;

[0049] 2. Add the above-mentioned mixed solution to the primary anaerobic effluent of 2 times the volume of alcohol wastewater at a feed load of 0.5% (volume ratio) for anaerobic fermentation. The fermentation temperature is 58±1°C, and the biogas is run for 5 days The production amount of the distiller's wine is unstable, and the gas production has a tendency to gradually decrease; on the 6th to 8th day, add 25% (W / V) fresh distiller's grains in the mixed solution to dilute it as anaerobic water inflow, so that the pH of the mixed solution ...

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Abstract

The present invention relates to process of treating acetic acid producing effluent and papermaking waste water comprehensively, and belongs to the field of chemical effluent treating technology. Acetic acid producing effluent of pH 3-5 and papermaking waste water of pH 12 are mixed in the volume ratio of 4 to 5-6, the mixture is anaerobically fermented to produce marsh gas, and the fermented waste water is further biologically treated in an aerobic tank until reaching the drainage standard. The process can decrease about 96 % polluting load in the acetic acid producing effluent and papermaking waste water.

Description

technical field [0001] The invention relates to a comprehensive treatment method for acetic acid production wastewater and papermaking wastewater, belonging to the technical field of chemical wastewater treatment. Background technique [0002] The water quality of acetic acid production wastewater is acidic. The pH of acetic acid production wastewater is 3 to 5. The water contains acetic acid, ethanol, and low suspended solids. Because acetic acid is an intermediate product in many biochemical treatment processes, acetic acid wastewater is an extremely biodegradable of organic wastewater. [0003] Papermaking wastewater includes pulping cooking black liquor and papermaking mid-stage wastewater. The main source of pollution in pulp and paper mills is the cooking black liquor of chemical pulping, the COD produced Cr 、BOD 5 It is about more than 90% of the total amount of pollutants in the pulping process. The pulp after cooking is extracted by black liquor. When the extrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/66C02F3/28C02F1/24C02F3/30C02F103/28C02F103/32
Inventor 张立省张超张宗彩
Owner 张立省
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