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A method for improving anaerobic acid production of kitchen waste

A technology of food waste and garbage, applied in the field of improving anaerobic acid production of food waste, can solve the problems of effluent alkalinity increase, accumulation, low pH value, etc., to promote anaerobic digestion acid production, reduce emissions, The effect of reducing emissions

Active Publication Date: 2018-08-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Low pH, high concentration of SO 4 2- , and NH 4+ The wastewater will inhibit the growth of microorganisms, which is not conducive to biochemical treatment
However, the high concentration of ammonia nitrogen in the wastewater can be used as a nitrogen source for the anaerobic digestion of kitchen waste to produce organic acids, but the high concentration of SO 4 2- It will cause the increase of effluent alkalinity and HS in the process of anaerobic digestion - Accumulation is very unfavorable to the growth of microorganisms
At present, there is no report in the prior art on anaerobic acid production of kitchen waste using MSG wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a method for improving the anaerobic acid production of kitchen waste, the steps are as follows:

[0039] 1) Drain the kitchen waste obtained from the hotel (moisture content is controlled below 80%) to remove impurities and crush to ≤20 mesh.

[0040] 2) Weigh 1700g of the pretreated kitchen waste obtained in step 1), mix it with 1150g of anaerobic activated sludge and fill it into a 5L CSTR anaerobic reactor;

[0041] 3) Using calcium oxide to treat high-concentration waste liquid produced by sulfuric acid fermentation to produce monosodium glutamate to obtain desulfurization waste liquid; the NH3-N concentration in the waste liquid was determined to be 10000 mg / L.

[0042] 4) Add 1 L of desulfurization waste liquid obtained in step 3) to the reactor in step 2), mix well, fill with inert gas to discharge air, and seal;

[0043] 5) Carry out anaerobic fermentation in the anaerobic environment obtained in step 4). At this time, the TS in the rea...

Embodiment 2

[0046] This embodiment provides a method for improving the anaerobic acid production of kitchen waste, the steps are as follows:

[0047] 1) Drain the kitchen waste obtained from the hotel (moisture content is controlled below 80%) to remove impurities and crush to ≤20 mesh.

[0048] 2) Weigh 1200g of the pretreated kitchen waste obtained in step 1), mix it with 2000g of anaerobic activated sludge and fill it into a 5L CSTR anaerobic reactor;

[0049] 3) Utilize calcium oxide to treat the high-concentration waste liquid produced by sulfuric acid fermentation to produce monosodium glutamate to obtain desulfurization waste liquid; after determination, the NH in the waste liquid 3 -N concentration is 10000mg / L.

[0050] 4) Add 0.5 L of desulfurization waste liquid obtained in step 3) to the reactor in step 2), mix well, fill with inert gas to discharge air, and seal;

[0051] 5) Carry out anaerobic fermentation in the anaerobic environment obtained in step 4). At this time, th...

Embodiment 3

[0054] This embodiment provides a method for improving the anaerobic acid production of kitchen waste, the steps are as follows:

[0055] 1) Drain the kitchen waste obtained from the hotel (moisture content is controlled below 80%) to remove impurities and crush to ≤20 mesh.

[0056] 2) Weigh 800g of the pretreated kitchen waste obtained in step 1), mix and fill in the CSTR anaerobic reactor of 5L with 1709g of anaerobic activated sludge;

[0057] 3) Using calcium oxide to treat the high-concentration waste liquid produced by sulfuric acid fermentation to produce monosodium glutamate to obtain desulfurization waste liquid; the NH in the waste liquid was determined 3 -N concentration is 10000mg / L.

[0058] 4) Add 1.5 L of desulfurization waste liquid obtained in step 3) to the reactor in step 2), mix well, fill with inert gas to discharge air, and seal;

[0059] 5) Carry out anaerobic fermentation in the anaerobic environment obtained in step 4). At this time, the TS in the ...

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Abstract

The invention discloses a method for improving anaerobic acid production of kitchen waste, and belongs to the technical field of anaerobic fermentation of rubbish. The method provided by the invention comprises the following steps: mixing and blending kitchen waste subjected to pretreatment with anaerobic activated sludge; adding highly concentrated monosodium glutamate wastewater subjected to desulfurization treatment, and carrying out anaerobic fermentation for acid production. According to the method provided by the invention, anaerobic digestion and acid production of kitchen waste can be facilitated, and the content of organic acid can be increased by 20% or above; besides, emission of monosodium glutamate wastewater can be reduced, energy conservation and emission reduction are achieved, operability is quite high, and the method is applicable to industrial popularization.

Description

technical field [0001] The invention relates to a method for improving anaerobic acid production of kitchen garbage, and belongs to the technical field of garbage anaerobic fermentation. Background technique [0002] Kitchen waste, commonly known as slops, is the kitchen waste and waste cooking oil formed by residents in the process of living consumption, mainly from households, restaurants, hotels, government agencies, enterprises and other catering units. The main components of food waste include rice, flour, vegetables, meat and bones, animal and vegetable oils, etc. From the perspective of chemical composition, it is mainly composed of starch, cellulose, protein, lipids, and inorganic salts. With the development of the economy and the improvement of people's living standards, the catering industry is also developing rapidly, and the output of kitchen waste is huge. In 2000, the output of kitchen waste in my country was about 45 million tons, and after 2009 it has reache...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/54C12P7/52
Inventor 李十中姜立张成明韩娅新陈雪兰
Owner TSINGHUA UNIV
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