Process for comprensive treating waste water of paper making by grass pulp

A technology for comprehensive treatment of papermaking wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of straw pulp and papermaking wastewater polluting the environment, and achieve reduction of pollution load, Reduction of processing cost, effect of cost reduction

A technology for comprehensive treatment of papermaking wastewater, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of straw pulp and papermaking wastewater polluting the environment, and achieve reduction of pollution load, Reduction of processing cost, effect of cost reduction

CN1623940AInactive Publication Date: 2005-06-08彭仲辉 +1
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  • Process for comprensive treating waste water of paper making by grass pulp

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Experimental program
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Effect test

Embodiment 1

[0076] 1. Process of black liquor treatment plan:

[0077] 1. Circulate the black liquor produced by presoaking low-temperature rapid cooking in the homogenization tank for 24 hours, so that the temperature is reduced to 35°C and the pH is about 12.

[0078] 2. Pump the thick black liquor in the homogeneous tank to the pipeline, add No. 1 agent, add No. 5 agent at an interval of about 10 seconds, and then add No. 2 agent at an interval of 10 seconds, enter the reaction tank, and then add No. 3 agent After 30 seconds, add agent No. 4 and adjust the pH to 14 for cooking.

[0079] 3. Pump the dilute black liquor in the homogeneous tank to the pipeline for treatment according to the agent and interval time for treating thick black liquor. At this time, the pH of the clear liquid reaches 4-5, and it is reused for pulp washing. After washing the pulp, adjust the pH to 6.5-8.5 and use a pump to enter the upflow anaerobic activated sludge tank. After full anaerobic digestion, it ente...

Embodiment 2

[0098] 1. Process of black liquor treatment plan:

[0099] 1. Circulate the black liquor produced by presoaking low-temperature rapid cooking in the homogenization tank for 30 hours, so that the temperature is reduced to 35°C and the pH is about 10.

[0100] 2. Pump the thick black liquor in the homogeneous tank to the pipeline, add No. 1 agent, add No. 5 agent at an interval of about 10 seconds, and then add No. 2 agent at an interval of 10 seconds, enter the reaction tank, and then add No. 3 agent After 30 seconds, add agent No. 4 and adjust the pH to 12 for cooking.

[0101] 3. The dilute black liquor in the homogeneous tank is pumped to the pipeline for treatment according to the agent and interval time for treating thick black liquor. At this time, the pH of the clear liquid reaches 4-5, and it is reused for pulp washing. After washing the pulp, adjust the pH to 6.5-8.5 and use a pump to enter the upflow anaerobic activated sludge tank. After full anaerobic digestion, it e...

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Abstract

A process for treating the sewage generated by making paper with straw pulp includes such steps as preimmersing by alkali method, adding activating agent prepared from anthraquinone derivative, sodium alkylphenylsulfonate and epoxy ethane, fast low-temp digestion, adding 5 kinds of flocculant sequentially for separation, flocculating, decoloring, decomposing lignin and depositing, anaerobic digestion, aerobic aerating, cleaning by biomembrane, and dewatering dregs to obtain fertilizer.

Description

technical field [0001] The invention provides a method for comprehensive treatment of papermaking wastewater, in particular to a method for comprehensive treatment of straw pulp papermaking wastewater. Background technique [0002] For a long time, the treatment technology of straw pulp papermaking wastewater, which has caused serious pollution to the environment, has not been well resolved. The reason is that the one-time project investment of alkali recovery technology is large, which is difficult for many enterprises to bear. In addition, due to the interference of straw pulp black liquor silicon and other reasons, the extraction rate of straw pulp black liquor is low, and the concentration and calorific value cannot meet the technical requirements. The alkali recovery of straw pulp cannot run stably for a long time, the cost of alkali recovery is too high, and the actual production effect is not ideal. At present, the existing black liquor treatment technologies in Chin...

Claims

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Application Information

Patent Timeline
08 Jun 2005
Publication
CN1623940A
IPC
C02F1/52; C02F3/02; C02F3/28; C02F3/30; C02F9/14
CPC
Y02W10/10
Inventors
彭仲辉; 汪中军