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Method for producing methane by combination fermentation of paper mill sludge and food waste

A technology of food waste and papermaking sludge, applied in biochemical equipment and methods, biological sludge treatment, solid-phase fermentation bioreactor, etc., can solve the constraints of anaerobic digestion application, high secondary fiber content, protein content Low-level problems, to achieve the effect of improving bioconversion rate, high methane yield, and simple process

Inactive Publication Date: 2010-12-15
SOUTH CHINA AGRI UNIV
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Problems solved by technology

However, due to the high content of secondary fiber and low protein content in papermaking sludge, the high C / N is not conducive to the normal process of anaerobic digestion, which restricts its application in anaerobic digestion.

Method used

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  • Method for producing methane by combination fermentation of paper mill sludge and food waste
  • Method for producing methane by combination fermentation of paper mill sludge and food waste
  • Method for producing methane by combination fermentation of paper mill sludge and food waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) The papermaking sludge used in the test was taken from the sludge dehydration workshop of a paper mill in Guangdong Province, and the retrieved fresh sludge was evenly dispersed;

[0031] (2) The experimental kitchen waste was taken from a student canteen of a university in Guangdong Province. The retrieved fresh kitchen waste was first sorted to remove solids with larger particle sizes (such as corncobs, plastic bags, etc.), and then mixed with water Mix according to a certain ratio, and crush it with a food crusher until the particle size can pass through a 40-mesh sieve;

[0032] (3) Evenly mix the papermaking sludge dispersed in step (1) and the pretreated kitchen waste in step (2) according to the volatile matter (VS) mass ratio of 1:1, wherein the amount of papermaking sludge added was 114.6g, and the amount added to the kitchen waste was 94.7g; the total volatile matter content of the mixture was 29.3g;

[0033] (4) The papermaking sludge (the quality of the...

Embodiment 2

[0039] (1) The papermaking sludge used in the test was taken from the sludge dehydration workshop of a paper mill in Guangdong Province, and the retrieved fresh sludge was evenly dispersed;

[0040] (2) The experimental kitchen waste was taken from a student canteen of a university in Guangdong Province. The retrieved fresh kitchen waste was first sorted to remove solids with larger particle sizes, and then crushed with a food crusher until the particle size could reach Pass 40 mesh sieve;

[0041] (3) The papermaking sludge dispersed in step (1) and the pretreated kitchen waste in step (2) are mixed according to the volatile matter (VS) mass ratio of 5:1, 3:1, 1:1, 1: 3, 1:5 for uniform mixing.

[0042] (4) Add the mixture obtained in step (3) into the anaerobic reactor of 1000mL respectively. According to the dry matter quality of the inoculated sludge being 10% of the dry weight of the fermentation raw material, add 70g of anaerobic reactor with a water content of 90.71%. ...

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Abstract

The invention belongs to the field of renewable energy sources and environmental protection, and relates to a method for producing methane by the combination fermentation of paper mill sludge and food waste. The method comprises the following steps of: uniformly mixing the paper mill sludge and smashed food waste in a volatile substance mass ratio of 1-25:5; adding an inoculum; and after forming a fermented material and diluting, fermenting for 30 to 50 days at 37+ / -2 DEG C under anaerobic conditions. In the method, the paper mill sludge and the food waste are mixed and are fermented under the anaerobic conditions, so that not only two kinds of solid waste are treated at the same time, but also the biological conversion rate of raw materials is improved to achieve higher methane yield. Because the paper mill sludge is usually alkaline and the food waste is usually acidic, the pH adjustment of materials in a fermentation process can be avoided by mixing and fermenting the paper mill sludge and the food waste. The method utilizes the theory of treating waste with the waste, and simultaneously effectively realizes the harmlessness, the reduction and the resource of the two kinds of the solid waste such as the paper mill sludge and the food waste.

Description

technical field [0001] The invention belongs to the field of renewable energy and environmental protection, and relates to a method for producing methane by joint fermentation of papermaking sludge and kitchen waste. Background technique [0002] Papermaking sludge refers to the mixed sludge obtained in the primary settling tank and secondary settling tank during the biochemical treatment of paper mill wastewater, excluding deinking sludge obtained from deinking waste paper in paper mills. Since the paper industry is a large water consumer, a large amount of papermaking wastewater has produced a large amount of papermaking sludge in the process of biochemical treatment. According to statistics, in 2007, China produced about 23.89 million tons of dewatered papermaking sludge (water content 80%), 478 10,000 tons of dry sludge. It is estimated that by 2020, China will produce approximately 30.88 million tons of dewatered papermaking sludge (with a moisture content of 80%, and 6...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C12M1/107
CPCC12M21/16Y02E50/343C12M41/34C12M21/04C12M41/26Y02E50/30Y02P20/59
Inventor 林云琴王德汉李庆黄利坚
Owner SOUTH CHINA AGRI UNIV
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