Method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws

A technology for excess sludge and straw, which is applied to chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve the problems of low acid production efficiency of anaerobic fermentation alone and low utilization rate of straw resources, and promotes The effects of acid production efficiency, sludge hydrolysis rate increase, and fermentation cycle shortening

Active Publication Date: 2016-07-20
GUANGDONG ENG TECH INST
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Problems solved by technology

[0005] Aiming at the problems of low resource utilization rate of excess sludge and straw and low efficiency of acid production by anaerobic fermentation of excess sludge alone, the present invention proposes a met

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  • Method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws
  • Method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws

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[0030] The present invention will be further described below with reference to the drawings and embodiments.

[0031] A method for using straws to intensify the alkaline fermentation of surplus sludge to produce acid. The method relies on a set of straw combined with sludge co-fermentation to produce acid. The sequential batch reactor is used for continuous anaerobic acid production. Mud processing capacity is 0.5m 3 / d, the specific steps are as follows:

[0032] 1. Pretreatment of straw

[0033] The straw comes from the rice straw in the farmland near the plant. The straw is naturally air-dried. The air-dried straw is cut into 5-7cm strips, washed with water, dried at 60°C to a constant weight, and then crushed into powder with a crusher ; Use alkali method to chemically pretreat the crushed straw. The specific method is to alkalize the straw with a sodium hydroxide solution with a concentration of 3%, according to the solid-liquid ratio (that is, the ratio of straw to sodium hydr...

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Abstract

The invention discloses a method for reinforcing alkaline fermentation and acidogenesis of excess sludge by straws. The method mainly comprises the following steps of pretreating the straws, pretreating the excess sludge, jointly fermenting the straws and the sludge, and removing the nitrogen and phosphor from fermenting liquid, wherein the straws are pretreated into a proper outer carbon source, and the excess sludge is pretreated by soaking liquid. The method has the advantages that compared with simple pure alkaline liquid, the concentration of the soaking liquid is higher; the concentration difference is formed between the inside and outside of sludge cells, and the plasmolysis of the sludge cells is caused, so that under the simultaneous action, the sludge treatment time is shortened, the carbon and nitrogen ratio of a straw-sludge fermenting system is adjusted, the hydrolysis of the excess sludge is enhanced, the efficiency of anaerobic fermentation and acidogenesis is promoted, the economic feasibility of the anaerobic fermentation technology of the sludge is improved, and the problem of low acidogenesis efficiency due to insufficient content of organic matters in the excess sludge is solved.

Description

technical field [0001] The invention relates to the technical field of environmental protection sludge treatment and disposal, in particular to a method for using straw to strengthen the alkaline fermentation of excess sludge to produce acid. Quantify. Background technique [0002] The treatment and disposal of excess sludge is difficult and expensive—the treatment cost accounts for 30-60% of the operation cost of the entire sewage treatment plant, which brings a huge burden to the operation of urban sewage treatment plants. Conventional treatment and disposal methods can no longer meet the requirements. Developing the internal carbon source of excess sludge and using sludge as a substrate to produce acids, methane and hydrogen with higher added value are the key to achieving sludge stabilization, resource utilization and reduction. new ways of transformation. [0003] Residual sludge contains a large amount of organic matter. Hydrolysis and acidification can not only achi...

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Application Information

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IPC IPC(8): C02F11/00C02F11/12C02F11/04C01B25/45
CPCC01B25/451C02F11/00C02F11/04C02F11/12C02F2209/06C02F2303/06
Inventor 罗晓栋姚创李诗瑶岳建雄饶俊元洪瑞申黄力彦谭艳来
Owner GUANGDONG ENG TECH INST
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