Anaerobic treatment process for high-concentration kitchen waste

A technology for food waste and anaerobic treatment, which is applied in the direction of solid waste removal, etc., can solve the problems of excessive ammonia nitrogen concentration and salt concentration in anaerobic reactors, unbalanced coupling metabolism of anaerobic bacteria, unfavorable growth of anaerobic microorganisms, etc. , to achieve the effect of reducing waste, avoiding reactor failure, and improving stability and sustainability

Inactive Publication Date: 2012-06-20
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

Jin Jianxiang et al. (Jin Jianxiang, Wang Shihe, Xiao Xuefeng, et al. Experimental research on the treatment of food waste by traditional anaerobic digestion process [J]. China Water Supply and Drainage, 2007, 23(15): 55-57) pointed out that food waste contains a lot of oil , is not conducive to the growth of anaerobic microorganisms, thus affecting the effect of anaerobic digestion
In the industrialized anaerobic system, the characteristics of high salt and high protein in the kitchen can easily lead to an imbalance in the coupling and metabolism between the anaerobic bacteria, resulting in excessive ammonia nitrogen and salt concentrations in the anaerobic reactor
At the same time, a large amount of oil contained in kitchen waste is easily adsorbed on anaerobic sludge flocs, causing bacteria to float up and lose

Method used

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  • Anaerobic treatment process for high-concentration kitchen waste

Examples

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Effect test

Embodiment 1

[0028] Collect swill and kitchen waste from nearby restaurants, about 5 t / d, with a solid content of 21%, and first pass through an 80-mesh drum sieve for solid-liquid separation to obtain solid and liquid kitchen waste.

[0029] The kitchen waste liquid enters the grease trap, and the top waste oil is collected as biodiesel raw material, and the lower water phase enters the A 2 / O process for nitrogen removal.

[0030] The solid-phase kitchen adopts magnetic separation method for preliminary separation to separate the metal impurities. The sorted garbage enters the TS320 crusher, and the crushed slurry is sent to the anaerobic digestion tank together with the return sludge of the secondary settling tank and the air flotation tank. The digestion time is 12 days; the overflow of the digested slurry enters the air flotation tank; , the discharged sludge is transported to landfill or composted after mechanical dehydration, and the digestive juice enters A 2 / O process. Under t...

Embodiment 2

[0033] Collect swill and kitchen waste from nearby restaurants, about 5 t / d, with a solid content of 21%, and first pass through an 80-mesh drum sieve for solid-liquid separation to obtain solid and liquid kitchen waste.

[0034] The kitchen waste liquid enters the grease trap, and the top waste oil is collected as biodiesel raw material, and the lower water phase enters the A 2 / O process for nitrogen removal.

[0035] The solid-phase kitchen adopts magnetic separation method for preliminary separation to separate the metal impurities. The sorted garbage enters the TS320 crusher, and the crushed slurry is sent to the anaerobic digestion tank together with the return sludge of the secondary settling tank and the air flotation tank. The digestion time is 16 days; the overflow of the digested slurry enters the air flotation tank; the bottom is discharged intermittently at regular intervals , the discharged sludge is transported to landfill or composted after mechanical dehydrat...

Embodiment 3

[0038] Collect swill and kitchen waste from nearby restaurants, about 5 t / d, with a solid content of 21%, and first pass through an 80-mesh drum sieve for solid-liquid separation to obtain solid and liquid kitchen waste.

[0039] The kitchen waste liquid enters the grease trap, and the top waste oil is collected as biodiesel raw material, and the lower water phase enters the A 2 / O process for nitrogen removal.

[0040] The solid-phase kitchen adopts magnetic separation method for preliminary separation to separate the metal impurities. The sorted garbage enters the TS320 crusher, and the crushed slurry is sent to the anaerobic digestion tank together with the return sludge of the secondary sedimentation tank and the air flotation tank. The digestion time is 20 days; the overflow of the digested slurry enters the air flotation tank; the bottom is discharged intermittently at regular intervals , the discharged sludge is transported to landfill or composted after mechanical deh...

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Abstract

The invention discloses an anaerobic treatment process for high-concentration kitchen waste, which mainly includes that kitchen waste is subjected to solid and liquid separation, waste liquid enters an oil separator, waste oil is used for producing biodiesel, water phase is subjected to the subsequent treatment in an A2/O process, after being subjected to metal impurity separation, solid-phase kitchen waste is crushed by a machine, then sent to an anaerobic digester to be mixed with returned sludge in a flotation tank and a secondary sedimentation tank so as to realize anaerobic digestion, and biogas generated from anaerobic digestion is used as an energy source after being desulfurized; digested slurry spills to enter the flotation tank; digested sludge is discharged intermittently at a fixed period and digested liquid is subjected to the A2/O process; the sludge on the upper layer of the floatation tank returns to the anaerobic digester, clean water phase is subjected to the A2/O process at the water treatment working section, outflow water enters the secondary sedimentation tank, the sludge is concentrated until the solid content thereof reaches 2%-3%, then returns to the anaerobic digester, and cleared water spills and is drained outwards. By the anaerobic treatment process for high-concentration kitchen waste, ammonia nitrogen, salt and grease loads entering the anaerobic digester can be reduced, failure of the anaerobic digester can be avoided, stability and continuity of the anaerobic process are improved, and expenses for sludge transportation and landfill disposal are decreased.

Description

technical field [0001] The invention belongs to the technical field of kitchen waste treatment, in particular to a high-concentration kitchen waste anaerobic treatment process in which the food waste is separated from the solid and liquid before the anaerobic digestion, and the waste water is reused as a diluent. Background technique [0002] With the rapid growth of China's urban economy, the output of kitchen waste is increasing, and the impact on the environment is becoming more and more serious. Food waste is mainly composed of starch, cellulose, and animal fat organic substances. It has the characteristics of high moisture, oil, and salt content, and is easy to rot, ferment, and stink. Random stacking without treatment will cause many social problems. [0003] In the past, the treatment method was to mix the kitchen waste with the rest of the domestic waste and send them to the landfill for direct landfill treatment, which not only caused the pollution of the groundwate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00B09B3/00
Inventor 宋海农张健许开绍王鑫宇杨崎峰陈楠朱琦韦艳玲
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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