Method for producing wastewater denitrification carbon source through lactic acid fermentation of kitchen waste

A food waste and lactic acid fermentation technology, which is applied to chemical instruments and methods, fermentation, anaerobic digestion, etc., can solve the problem of high cost of additional carbon sources, achieve efficient resource utilization, convenient operation, and simple process flow Effect

Active Publication Date: 2020-06-26
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0007] In view of the problems existing in the existing kitchen waste treatment and recycling technology, and the problem of high price of additional carbon source for denitrification in sewage treatment, the present invention provides a method for producing waste water denitrification carbon source by lactic acid fermentation of kitchen waste. Simple production cost and low cost, realize resource utilization of food waste, and provide cheap carbon source for denitrification section of sewage treatment plant

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  • Method for producing wastewater denitrification carbon source through lactic acid fermentation of kitchen waste
  • Method for producing wastewater denitrification carbon source through lactic acid fermentation of kitchen waste
  • Method for producing wastewater denitrification carbon source through lactic acid fermentation of kitchen waste

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Embodiment 1

[0036] The food waste collected and transported by the municipal government is sorted to remove metals, plastics, etc., mixed with water according to the solid-to-liquid ratio of 1:1 (w / v), injected into the pulverizer for crushing and refining, and the coarse refining is passed through the filter screen (Φ1mm ) for quality and phase separation. The filter residue intercepts about 40% of the protein in the kitchen waste, and the protein content of the filter residue on a dry basis is 32.52%, which can be collected and reused. The filtered food waste slurry cooking tank is heated at 80°C for 60 minutes, and 75% of the waste oil in the food waste is extracted and recovered by a three-phase separator. After the oil is extracted, the garbage slurry is injected into the anaerobic fermentation tank, and the slurry in the continuous food waste lactic acid complex bacteria expansion reactor is extracted as the inoculum, the inoculation ratio is 10% (v / v), the initial pH value is adjus...

Embodiment 2

[0038] Sequencing batch SBR reactor, effective volume 8L, hydraulic retention time 6h, operation mode 120min aerobic, 180min anoxic, 60min static. The initial concentration of ammonia nitrogen in the reactor was 45mg / L, and the addition of food waste lactic acid fermentation liquid carbon source directly increased the COD concentration of the influent water to 400mg / L, adjusted the COD / TN ratio of 9, and converted the ammonia nitrogen in the water body to nitrate nitrogen 21.9 after aeration for 2 hours mg / L, no nitrite nitrogen; after anoxic denitrification treatment for 3 hours, no nitrate nitrogen and nitrite nitrogen were detected in the effluent, the concentration of ammonia nitrogen was 2.0mg / L, and the concentration of COD in the effluent was 48mg / L. For the change of nitrogen concentration, see Figure 4 . Denitrification rate up to 6.43NO 3- mg / (gMLVSS·h) -1 .

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Abstract

The invention discloses a method for producing a wastewater denitrification carbon source through lactic acid fermentation of kitchen waste, and belongs to the technical field of solid waste resourceful treatment. The method comprises the steps of adopting kitchen waste as a raw material; sorting and impurity removal, controlling the solid-to-liquid ratio, grinding, pulping, and carrying out quality-based and phase-splitting treatment; after the waste oil is heated and recycled, the residual garbage slurry is injected into an anaerobic fermentation tank for batch lactic acid fermentation, after fermentation is finished, solid-liquid separation is carried out, lactic acid-containing supernatant can be directly used as a liquid carbon source in the sewage denitrification stage, a good biological denitrification effect is achieved, nitrogen-containing residues can be collected and recycled, and full recycling is achieved. According to the invention, kitchen waste is directly used for efficient open lactic acid fermentation; according to the method, the indigenous microbial flora in the kitchen waste is fully utilized to hydrolyze the substrate and efficiently and directionally convertthe substrate into lactic acid, exogenous nutrition and industrial enzyme preparations do not need to be added, the process is simple, the production cost is low, a cheap carbon source is provided for a denitrification section of a sewage treatment plant while resource utilization of the kitchen waste is realized, and the biological denitrification efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of solid waste resource treatment, in particular to a method for preparing sewage denitrification plus a liquid carbon source by using kitchen waste as a raw material through an efficient open lactic acid fermentation mode. Background technique [0002] With the increase of urban population and the continuous improvement of people's living standards, the output of food waste in my country is also increasing year by year. According to the calculation of domestic waste removal and transportation in major large and medium-sized cities in my country, in recent years, my country's major cities have actually produced an average of no less than 60 million tons of food waste per year, and in 2016, about 88.65 million tons of food waste were generated. With the gradual advancement of the garbage classification system in my country, the food waste generated in the catering industry and daily life is collected and tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C12P7/56C12P7/54C12P7/52
CPCC02F3/28C02F2305/06C12P7/52C12P7/54C12P7/56
Inventor 高明汪群慧李晓玲吴川福马晓宇朱文彬李媛
Owner UNIV OF SCI & TECH BEIJING
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