Sludge pretreatment method and method of producing acid by anaerobic fermentation of sludge

A pretreatment, sludge technology, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problem that the sludge has not been properly treated and disposed, and the ultrasonic pretreatment of sludge has high energy consumption , the proportion of less than 20%, etc., to achieve the effect of significant cavitation effect, long fermentation time, and increased volatile acid concentration

Inactive Publication Date: 2019-02-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

The output of my country's urban sludge is about 30 million tons (calculated at a moisture content of 80%), and up to 80% of the sludge has not been properly treated, resulting in a serious waste of organic matter, energy, nitrogen, phosphorus and other nutrients.
At present, the main methods of sludge disposal in my country are landfill and construction material utilization, of which less than 20% can truly achieve safe disposal
However, ultrasonic pretreatment of sludge has disadvantages such as high energy consumption, easy corrosion of equipment, and high operating costs.

Method used

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  • Sludge pretreatment method and method of producing acid by anaerobic fermentation of sludge
  • Sludge pretreatment method and method of producing acid by anaerobic fermentation of sludge
  • Sludge pretreatment method and method of producing acid by anaerobic fermentation of sludge

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Embodiment 1

[0042] A method for producing acid by anaerobic fermentation of sludge pretreated by ultrasonic coupling with persulfate, specifically carried out according to the following steps:

[0043] Step 1. At room temperature (25°C), sodium persulfate was used as the oxidant required for advanced oxidation technology during the experiment, and 0.24g of sodium persulfate was weighed with 100ml of return sludge from urban sewage treatment plants (sludge concentration 14g / L) Fully mix in a 100ml beaker to obtain mixed sludge, that is, control the concentration of sodium persulfate to 10mM / L.

[0044] Step 2, use such as figure 1 The ultrasonic cell breaker shown in the figure performs ultrasonic treatment on the mixed sludge in step one. The ultrasonic breaker is the JY90-II type ultrasonic cell breaker of Xinzhi Company, including: a controller 6, a soundproof box 5, and a height adjustment device 4 set in the soundproof box 5, a sample table 3, a horn 2 and a changer. The transducer ...

Embodiment 2 to 5

[0054] Similar to the method of Example 1, according to the reagents, dosage and conditions shown in Table 1, the sludge is subjected to the pretreatment of step 1 to step 3, and after pretreatment, sampling is carried out for COD measurement. It can be seen that the pretreatment method of the present invention can effectively Increasing the SCOD content is beneficial to the subsequent anaerobic fermentation treatment.

[0055]

[0056] To sum up, the present invention uses advanced oxidation technology combined with ultrasonic to strengthen sludge floc cracking, which greatly improves the degree of sludge cracking, improves the biochemical properties of sludge, and provides more abundant sludge for the subsequent anaerobic fermentation hydrolysis stage. Substrate, thus greatly improving the volatile acid production in the subsequent anaerobic fermentation process of sludge, effectively alleviating the limitation caused by the hydrolysis stage in the sludge anaerobic digesti...

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Abstract

A sludge pretreatment method and a method of producing an acid by anaerobic fermentation of sludge are provided. The sludge pretreatment method includes: adding a persulfate into sludge, and mixing well to obtain mixed sludge; ultrasonically treating the mixed sludge. Further, the invention provides the method of producing an acid by anaerobic fermentation of sludge; after sludge is subjected theaforementioned pretreatment, the sludge is subjected to anaerobic fermentation. sludge floc disintegration is enhanced by advanced oxidation in combination with ultrasonic treatment, sludge disintegration degree is greatly increased, sludge biodegradability is improved, rich substrate is provided for subsequent hydrolysis stage of anaerobic fermentation, and the yield of volatile acids in the subsequent anaerobic fermentation of sludge is greatly increased.

Description

technical field [0001] The invention relates to the technical field of excess sludge treatment, in particular to a sludge pretreatment method and a sludge anaerobic fermentation acid production method. Background technique [0002] In recent years, with the improvement of the efficiency of sewage treatment plants, the sludge recovery rate has increased, and its output has continued to increase. The output of urban sludge in my country is about 30 million tons (calculated with a water content of 80%), of which up to 80% of the sludge has not been properly treated, resulting in a serious waste of organic matter, energy, nitrogen, phosphorus and other nutrients contained therein. At present, the main methods of sludge disposal in my country are landfill and construction material utilization, of which less than 20% can be safely disposed of. Worldwide, anaerobic digestion technology has good prospects in sludge treatment. It has the advantages of small sludge output, low energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/06C02F11/04C12P7/40
CPCC02F11/00C02F11/04C02F11/06C02F2303/06C12P7/40
Inventor 王爱杰王慧刘文宗蔡伟伟李佳琦
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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