Method and device for concentration of biogas and standard emission of clear liquid

Abstract

The invention discloses a method for concentration of biogas and standard emission of clear liquid. The method comprises the steps of sediment processing, nitration processing, membrane contraction processing, nutrient mixing processing, disinfection processing and the like, wherein through the nitration processing, ammpnium nitrogen in the biogas is converted into nitrate nitrogen, thus the nitrogen emission in effluent is reduced, the nitrogen is maintained in concentrated liquid, the effective nutrient in the concentrated liquid is improved by above 2 times, the recycle rate of the clear water reaches about 80%, and simultaneously, the standard emission of permeation liquid can be achieved or recycled after disinfection. The invention also discloses a device for implementing the method. By using the method and device provided by the invention, the reduction high value utilization of the biogas and the standard emission of the permeation liquid are achieved, thereby reducing the pollution of environment.

Description

technical field [0001] The invention relates to a high-value utilization technology of biogas slurry, in particular to a method and equipment for discharging concentrated biogas slurry and clear liquid up to the standard by using a combination of biochemical treatment process and membrane separation technology, belonging to the field of waste resource recycling in the agricultural field . Background technique [0002] With the increasing proportion of large-scale farming in my country, the amount of waste generated is large and concentrated. If it is not treated or handled properly, it will cause serious environmental pollution problems. Anaerobic digestion is a very effective way to treat livestock and poultry manure and sewage. Through anaerobic fermentation, it can not only realize the harmless treatment of waste, but also generate a large amount of biogas for heating, cooking and power generation. At the same time, the fermented biogas residue and biogas slurry contain Ri...

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Problems solved by technology

For this reason, related inventors have conducted research on biogas slurry concentration using membrane separation technology. For example, CN101402530 discloses that the applicant uses micro-flocculation microfiltration and nanofiltration to concentrate biogas slurry. CN101269999 discloses the selection of membranes of different grades Separation and concentration of biogas slurry active components according to the molecular weight, CN101712555 discloses the method of using sand filtration and reverse osmosis to concentrate biogas slurry, but these applicants directly perform membrane filtration on anaerobic fermentation liquid, and use livestock and poultry In the biogas slurry project dominated by farm waste, the nitrogen in the biogas slurry mainly exists in the form of ammonium nitrogen, and its molecular weight is equivalent to that of water. If the conversion of nitrogen form is not carried out, it is difficult to use membrane filtration technology The interception of state nitrogen leads to high concentration of ammonia nitrogen in the permeate, and the permeate cannot be discharged up to the standard. However, there are no relevant reports on the concentration and discharge of the clear liquid using biogas slurry as raw material.

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