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Method for producing methane by utilizing papermaking black liquid caused by ammonium sulfite method

A technology of papermaking black liquor and ammonium method, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of poor practicability and complicated process, and achieve the effect of simple and practical method, solving waste water pollution and large amount of methane

Active Publication Date: 2014-01-08
INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The CN1420091A (CN02112724.7) patent document provides a method for ecological treatment and resource recycling of papermaking wastewater. The method is to use ecological engineering technology to adjust the ratio of BOD:COD in the papermaking wastewater in the sedimentation tank, and then enter the series Anaerobic ponds and facultative ponds are digested, and the drainage is adjusted in the COD:N:P ratio in the regulating pond, and then enters multiple groups of parallel surface runoff wetlands through the water transmission and distribution system. This method can treat papermaking wastewater, but the process is complicated and practical. poor sex
So far, there is no public report on the production of biogas from papermaking black liquor by the ammonium method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Papermaking black liquor is the black liquor produced in the process of papermaking by ammonium method, wherein 6wt% NaOH and 11wt% (NH 3 ) 2 SO 3 , based on the absolute dry pulp weight.

[0050] The method for producing biogas from papermaking black liquor by ammonium method, the steps are as follows:

[0051] Wheat straw is taken as raw material for papermaking, pulverized to 1-5mm by a pulverizer, and dried to dry wheat straw with a moisture content of 8% by mass; stored in a straw storage room for later use.

[0052] Take the above-mentioned ammonium method papermaking black liquor and place it in the pretreatment tank, add calcium bicarbonate, the mass ratio of calcium bicarbonate and papermaking black liquor is 1:65, stir for 8 minutes; then add the above-mentioned dry wheat straw and fresh cow manure (moisture content is mass percent 78-80%), papermaking black liquor: dry wheat straw: the mass ratio of fresh cow dung is 200: 1: 50; Regulate C / N ratio to 25: 1...

Embodiment 2

[0055] As described in Example 1, the difference is that after the last step and adjusting the pH value to 7.2, the microbial inoculum "Lvjingling" brand biogas inoculum was added to the anaerobic reactor, 3 Add 0.08kg of the mixed solution, stir evenly, seal it, and anaerobically ferment it. The mixed material circulates in the anaerobic reactor for 12 days and enters the normal gas production stage. The continuous mode of normal feeding is adopted, the hydraulic retention time is 8 days, and the fermentation temperature is 36°C , the pool capacity gas production rate is 1.2m 3 / m 3 d.

Embodiment 3

[0057] Papermaking black liquor is the black liquor produced in the process of papermaking by ammonium method, wherein 3wt% NaOH and 15wt% (NH 3 ) 2 SO 3 , based on the absolute dry pulp weight.

[0058] The method for the production of biogas from the ammonium method papermaking black liquor is as described in Example 1, except that the mass ratio of calcium bicarbonate and papermaking black liquor is 1: 72;

[0059] The mass ratio of papermaking black liquor: dry wheat straw: fresh cow manure is 200:1.2:52; adjust the C / N ratio to 26:1, BOD 5 : COD is 0.27;

[0060] In the anaerobic reactor, add the microbial bacterial agent for the biogas digester (produced and sold by Shandong Jinmao Biological Products Co., Ltd.), the microbial bacterial agent per m 3 Add 0.10 kg of microbial agent to the mixed solution, stir evenly, and seal for anaerobic fermentation. The mixed material circulates in the anaerobic reactor for 11 days, enters the stage of normal gas production, and ...

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Abstract

The invention relates to a method for producing methane by utilizing papermaking black liquid caused by an ammonium sulfite method. The method comprises the steps of adding calcium bicarbonate in the papermaking black liquid, then adding dry wheat straws or decomposed coals, dairy cow excrements or pig excrements, adding 20-25% of sanitary sewage anaerobic digestion sludge or adding a microbial agent for a methane tank, and conducting combining fermentation to generate methane. According to the method, the produced methane can be used for power generation, methane residues are used for preparing an organic fertilizer, methane slurry is prepared to be a liquid fertilizer, and the methane energy resources and the organic fertilizer can be obtained simultaneously when the papermaking black liquid is processed to control the environment pollution.

Description

technical field [0001] The invention relates to a method for resource utilization of ammonium-based papermaking black liquor to produce biogas, and belongs to the field of waste water treatment in environmental engineering. Background technique [0002] At present, the discharge of industrial wastewater directly pollutes the ecological environment on which human beings depend and affects human health. Papermaking wastewater is one of the main industrial wastewater and one of the important factors of environmental pollution. Papermaking wastewater includes cooking black liquor, mid-stage wastewater, white water, etc., which are seriously polluted. In recent years, the paper industry has developed rapidly. There are more than 10,000 large, medium and small paper mills in my country, and the annual wastewater discharge volume is as high as more than 4 billion cubic meters, accounting for 10% of the total wastewater discharge in the country. [0003] For the alkaline papermaki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 王艳芹胡成昌林红珍姚利付龙云刘培军袁长波李国生杨光边文范
Owner INST OF AGRI RESOURCES & ENVIRONMENT SHANDONG ACADEMY OF AGRI SCI
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