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Membrane contactor-based anaerobic digestive treatment system for side-flow recovery of ammonia nitrogen

An anaerobic digestion, membrane contactor technology, applied in biological sludge treatment, biochemical instruments, sterilization methods, etc., can solve the problems of complex sewage treatment system facilities, large scale, increased treatment costs, etc., to weaken the inhibition of ammonia nitrogen effect, reduced usage, low disposal cost

Inactive Publication Date: 2017-01-25
IMP ENVIRONMENT SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use fresh water, and the sewage treatment system facilities are complicated and large in scale, which increases the treatment cost

Method used

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  • Membrane contactor-based anaerobic digestive treatment system for side-flow recovery of ammonia nitrogen

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Effect test

Embodiment 1

[0021] The kitchen waste treatment plant in a venous industrial park in the south has a processing scale of 100t / d (with an average solid content of 24%). It collects and treats kitchen waste from canteens, large hotels and resorts of enterprises and institutions in a certain city. The process is an anaerobic digestion treatment system with membrane contactor side flow recovery of ammonia nitrogen, that is, pretreatment (sorting + screening + crushing + cooking to remove oil) + anaerobic digestion + solid-liquid separation, biogas residue is composted and sold as organic fertilizer , The biogas slurry adopts the side flow of the membrane contactor to recover the ammonia nitrogen and uses it as the feed preparation water, and the rest reaches the standard and is discharged.

[0022] The food waste is first sorted, screened, crushed, cooked and deoiled in the pretreatment device (1). After the treatment, the average solid content of the food waste is 24%, and the ammonia nitrogen...

Embodiment 2

[0029] The sludge treatment and disposal center in a certain city in Hebei Province, with a processing scale of 300t / d (20% solid content), collects and treats dewatered sludge produced by municipal sewage treatment plants in a certain city. The process is an anaerobic digestion treatment system with side flow recovery of ammonia nitrogen with a membrane contactor, that is, sludge silo + homogeneous tank + anaerobic digestion + solid-liquid separation, the biogas residue is composted as nutrient soil, and the biogas slurry adopts a membrane contactor Ammonia nitrogen is recovered from the side stream and used as feed preparation water, and the rest is discharged out when it reaches the standard.

[0030] The sludge from the sewage treatment plant is sent to the pretreatment device (1) of the sludge treatment center through a sealed vehicle. The pretreatment device (1) includes a sludge silo, a conveyor, and a pulper; after pretreatment, the ammonia nitrogen content of the sludg...

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Abstract

The invention discloses a membrane contactor-based anaerobic digestive treatment system for side-flow recovery of ammonia nitrogen, which comprises a pretreatment device, a homogenizing tank, a digestion tank, a dewatering device, a biogas slurry tank, a filter, a denitrification membrane contactor, a denitrified liquid thank, an acid circulation tank and an ammonium recovery unit, wherein the homogenizing tank is used for homogeneously mixing the pretreated feedstock and the recycled deamination liquid, and the mixed liquid enters the digestion tank; the dewatering device is used for solid-liquid separation of materials discharged from the digestion tank, the biogas residue is utilized after being treated, and the biogas slurry is temporarily stored in the biogas slurry tank; a tubular hydrophobic deamination membrane is arranged inside a deamination contactor and is used for transferring and absorbing the ammonia nitrogen molecules in the biogas slurry by use of acid penetration difference, and the denitrified liquid flows back to the homogenizing tank; and the acid circulating tank is connected with the deamination membrane contactor via a water pump and pipes to form a circulation pipeline, and acid is periodically supplemented or discharged to the ammonium recovery unit for recovery of ammonium salts according to the pH value in the tank. The device recovers the ammonia nitrogen in the biogas slurry, and the denitrified liquid flows back to the homogenizing tank, so as to avoid the inhibiting effect of the ammonia nitrogen on the digestive system and save feedstock conditioning water.

Description

technical field [0001] The invention relates to the technical field of environmental protection and the technical field of biomass energy recovery and utilization. It can be used in biogas projects for anaerobic digestion of organic waste such as kitchen waste, residual sludge from sewage treatment plants, and agricultural waste. Background technique [0002] Anaerobic digestion of organic waste can recover energy, which is a treatment method with broad application prospects. Nitrogen-containing organic matter is finally converted into ammonia nitrogen in the anaerobic digestion process. Practice has proved that when the concentration of ammonia nitrogen reaches a high concentration, the anaerobic methanogenesis process will be significantly inhibited, which will lead to the collapse of the anaerobic digestion system. In addition, the biogas slurry with a high concentration of ammonia nitrogen is also a waste liquid that causes environmental pollution and cannot be discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12M1/12C12M1/107C12P5/02C02F11/04
CPCC12M21/04C12M29/04C12M29/18C12P5/023C02F11/04Y02E50/30
Inventor 杨晓冬左东升马程蒋富海陈宁
Owner IMP ENVIRONMENT SCI & TECH
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