Mixed microbial-ensilage stabilizing pretreatment method for agricultural straw and surplus sludge

A technology for excess sludge and pretreatment, applied in biological sludge treatment, pyrolysis treatment sludge, biofuel, etc., can solve problems such as discarding in the field or burning on site, air pollution, and unreasonable utilization of straw

Inactive Publication Date: 2017-05-24
ZHENGZHOU KAISHAN BIOCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization of straw in our country is unreasonable. Except for some of them are used as feed or directly burned for cooking by farmers, most of the rest are discarded in the field or burned on the spot, which not only causes waste of resources, but also causes serious pollution to the atmospheric environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Weigh 1 kg of corn stalks crushed to a length of 20 mm, add 1000 g of hydrothermally treated sludge (solid content 10%), and anaerobically treat it for 28 days after adding microbial agents;

[0016] 2) The material after anaerobic treatment is put into a biogas fermentation tank for anaerobic digestion. The fermentation temperature is controlled at 45°C and the stirring rate is controlled at 150. After 30 days of fermentation, the average biogas production of 1kg of dry material is 0.455m 3 .

Embodiment 2

[0018] 1) Weigh 1 kg of corn stalks crushed to a length of 20 mm, add 1000 g of hydrothermally treated sludge (solid content 10%), and anaerobically treat it for 28 days after adding microbial agents;

[0019] 2) The material after anaerobic treatment is added to the fermenter for synchronous saccharification and fermentation of alcohol (10% solid content, the fermentation microorganism is Angel Alcohol Yeast). The highest alcohol concentration reaches 45g / L.

Embodiment 3

[0021] 1) Weigh 1 kg of corn stalks crushed to a length of 20 mm, add 1000 g of hydrothermally treated sludge (solid content 10%), and anaerobically treat it for 28 days after adding microbial agents;

[0022] 2) The material after anaerobic treatment is added to the fermenter for simultaneous saccharification and fermentation of lactic acid (15% solid content, and the fermentation microorganism is lactic acid bacteria). Reached 78g / L.

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Abstract

The invention relates to a mixed microbial-ensilage stabilizing pretreatment method for agricultural straw and surplus sludge. A large quantity of feedstock straw and the surplus sludge of sewage treatment plants are selected as main raw materials. The surplus sludge is treated by a hydrothermal reaction and then is proportionally mixed with the agricultural straw for strengthened microbial anaerobic treatment (microbial ensilage), a microbial-ensilaged mixed material can be applied to the production of biogas through anaerobic digestion, or the production of cellulosic ethanol, or the fermentation of substances such as lactic acid and butanol, and the stabilized, harmless, decreased and resource-converting utilization of wastes is achieved while the straw and the surplus sludge are effectively treated, so that the method is in line with the development direction in the future.

Description

technical field [0001] The invention belongs to the technical field of biomass energy, and in particular relates to a method for stabilizing mixed micro-storage of agricultural straw and excess sludge. Background technique [0002] Energy shortage and environmental crisis have become the main obstacles to the sustainable development of human society. It has become the consensus of human development to seek renewable resources and energy, reduce dependence on fossil energy, and protect the ecological environment. Among renewable energy resources, agricultural straw ranks fourth in the world's total energy consumption after coal, oil and natural gas. It is not only rich in reserves, but also widely distributed, with little geographical restrictions. Therefore, the utilization of agricultural straw has been highly valued. my country is one of the countries with the most abundant straw resources in the world, and the amount of various crop straws that can be collected every yea...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C12P5/02C12P7/10C12P7/56C12P7/52C02F11/04C02F11/10
CPCC02F11/04C02F11/10C12P5/023C12P7/10C12P7/52C12P7/56C12P2203/00Y02E50/10Y02E50/30
Inventor杨旭马晓建李洪亮李楠
OwnerZHENGZHOU KAISHAN BIOCHEM ENG