Open type method for producing fermentated lacitc acid and feedstuff using kitchen residue

An open fermentation and kitchen waste technology, applied to animal feed, animal feed, solid waste removal, etc., can solve the problems of low protein content, complicated process, low lactic acid production, etc.

Inactive Publication Date: 2006-10-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that existing closed lactic acid fermentation requires strict sterilization and inoculation of fermenting bacteria, and needs to add nutrients (such as nitrogen, phosphorus, potassium, etc.) required for the growth of lactic acid bacteria. It is beneficial to the problem of low protein content in feedstuffs processed from kitchen wastes, and provides a method for producing lactic acid and feedstuffs through open fermentation of kitchen wastes

Method used

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  • Open type method for producing fermentated lacitc acid and feedstuff using kitchen residue

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specific Embodiment approach 1

[0005] Specific Embodiment 1: In this embodiment, lactic acid is produced by open-type fermentation of food waste through the following steps: (1) filtering and pulverizing the food waste; (2) adding solid food waste to the pulverized solid food waste 1-3 times the quality of water; (3) Add cellulase and amylase to the solid-liquid mixed kitchen waste, add 10-20kU of cellulase and 5-10kU of amylase per 100g of solid-liquid mixed kitchen waste (4) The solid-liquid mixed kitchen waste added with cellulase and amylase is fermented intermittently for 20-30 hours under the condition of 35-50°C, and calcium carbonate is added to keep the solid-liquid mixed kitchen waste The pH value is 5-6; (5) solid-liquid separation, and then purifying the lactic acid in the fermentation broth to obtain lactic acid.

[0006] In this embodiment, kitchen waste includes leftovers and vegetables and fruit leftovers discarded by households and restaurants; whey from milk factories, distiller's grains f...

specific Embodiment approach 2

[0010] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: Step (2) Add water with 1.2 to 2.8 times the mass of solid food waste into the pulverized solid food waste. Other steps are the same as those in Embodiment 1.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the water that adds in the step (two) is tap water, kitchen waste filtrate or dining room, canteen waste water. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for preparing lactic acid and feed stuff with kitchen refuse in open type. The invention saves steps in current close-type process of strict sterilization and zymogeneous bacteria inoculation, nutrient addition and improves the lactic acid yield and protein content in prepared feed stuff. The lactic acid preparation comprises following steps: (1) drying and disintegrating kitchen refuse; (2) adding water; (3) adding cellulase and amylase; (4) open fermenting; (5) solid-liquid separating; (6) purifying and getting the lactic acid in fermentation liquor. The feed stuff preparation comprises following steps: (1) drying and disintegrating kitchen refuse; (2) adding water; (3) adding cellulase and amylase; (4) open fermenting; (5) solid-liquid separating; (6) sterilizing and drying the leavings, getting the feed stuff. The lactic acid content percent in organic acid is 94-98%, and its yield amounts to 64-75 g/l. The coarse protein content percent in feed stuff is 25-35% of the total feed stuff.

Description

technical field [0001] The invention relates to a method for producing lactic acid and feed from kitchen waste. Background technique [0002] Kitchen waste is a kind of biomass waste with high organic matter content and occupies a large proportion in municipal solid waste. Therefore, the fermentation of food waste to produce lactic acid and feed can not only effectively protect the environment, but also turn waste into treasure to create economy. value. The existing closed lactic acid fermentation requires strict sterilization and inoculation of fermentation bacteria, and the addition of nutrients (such as nitrogen, phosphorus, potassium, etc.) required for the growth of lactic acid bacteria, which has the problems of complex process and low lactic acid yield. The protein content in the existing feed processed from food waste is low. Contents of the invention [0003] The purpose of the present invention is to solve the problem that existing closed lactic acid fermentati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23K1/10B09B3/00A23K10/26A23K10/37
CPCY02P60/87
Inventor 汪群慧王孝强王旭明
Owner HARBIN INST OF TECH
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