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Method for strengthening anaerobic digestion effect by cooperatively fermenting kitchen waste and fruit-vegetable garbage

A fruit and vegetable garbage and anaerobic digestion technology, applied in the direction of fermentation, waste fuel, etc., can solve the problems of repeated construction, reduction, and over-acidification of anaerobic digestion facilities, so as to facilitate the promotion of large-scale continuous production and improve fermentation efficiency Effect

Inactive Publication Date: 2016-08-24
HUATIAN ENG & TECH CORP MCC
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Problems solved by technology

[0004] At present, the anaerobic digestion of municipal solid waste mainly uses a single type of fruit and vegetable or kitchen waste as raw materials, which leads to repeated construction of anaerobic digestion facilities
Moreover, due to the unbalanced nutrient elements in the fermentation system of a single raw material, it is easy to cause the accumulation of VFA, leading to the occurrence of excessive acidification, resulting in a sharp drop in pH in the anaerobic digestion system, inhibiting the physiological activity of methanogens, and even causing system collapse

Method used

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  • Method for strengthening anaerobic digestion effect by cooperatively fermenting kitchen waste and fruit-vegetable garbage

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Embodiment

[0027] 1. Raw material pretreatment: First, through mechanical sorting, non-biodegradable inorganic substances, metals, plastics and other substances in the raw materials are removed. Then the kitchen waste and fruit and vegetable waste are crushed separately with a crusher, and the crushed fruit and vegetable waste is crushed into a slurry with a press, and solid-liquid separation is achieved after centrifugation. The obtained fruit and vegetable dregs were soaked in NaOH solution with a mass concentration of 2% for 30 hours, and the broken food waste was kept at 120°C for 80 minutes of wet heat treatment, and then heated at 2500r·min. -1 Centrifuge for 15 min at 100 rpm.

[0028] 2. Start-up and operation of the acid-generating phase system: the acid-generating phase reactor adopts ASBR technology, the effective working volume is 2m3, the reaction temperature is controlled at 35±1°C, and the stirring intensity is 120r·min -1 , stirring for 5min every 3h. The raw material e...

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Abstract

The invention discloses a method for strengthening anaerobic digestion effect by cooperatively fermenting kitchen waste and fruit-vegetable garbage. The method at least comprises the following steps: deoiling the kitchen waste; and separating juice from residue after crushing the fruit-vegetable garbage. According to the method disclosed by the invention, the step of deoiling the kitchen waste and the step of separating juice from residue after crushing the fruit-vegetable garbage are increased, so that the subsequent fermentation efficiency of an anaerobic digestion system is greatly improved, and large-scale continuous production and popularization of an anaerobic digestion technology are facilitated.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a method for synergistic fermentation of kitchen and fruit and vegetable waste to enhance the effect of anaerobic digestion. Background technique [0002] With the continuous acceleration of my country's urbanization process, the output of municipal solid waste is also increasing continuously. According to data from China Statistical Yearbook, as of 2014, the annual volume of municipal solid waste in my country has reached 178.6 million tons, of which about 50% is kitchen and fruit and vegetable waste, which greatly limits the development of cities. [0003] Municipal solid waste has the following characteristics: high moisture content, low calorific value, high fluidity; easy biodegradation, perishable; high organic matter content, rich in N, P, K, Ca, and various trace elements; oil, salt content is higher. The types and contents of heavy ...

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Application Information

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IPC IPC(8): C12P5/02
CPCC12P5/023Y02E50/30
Inventor 王龙程寒飞詹茂华
Owner HUATIAN ENG & TECH CORP MCC
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