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A method of combined pretreatment of activated sludge to produce short-chain fatty acids

A short-chain fatty acid and activated sludge technology, which is applied in sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problem that the sludge degradation rate cannot meet market demand, achieve resource reduction and increase production , the effect of reducing operating costs

Active Publication Date: 2016-04-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the sludge degradation rate of the above technologies still cannot meet the market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for joint pretreatment of activated sludge to produce short-chain fatty acids, comprising the steps of:

[0026] (1) 1L of activated sludge is irradiated with γ-rays, the irradiation intensity is 12kGy, and the irradiation time is 10s, to obtain the sludge after γ-ray irradiation;

[0027] (2) The γ-ray irradiated sludge obtained in step (1) is subjected to ultrasonic treatment, the ultrasonic frequency is 30KHz, the ultrasonic sound energy density is 1.1W / mL, and the treatment time is 40min to obtain the ultrasonically treated sludge;

[0028] (3) Adjust the pH value of the ultrasonically treated sludge obtained in step (2) to 10, and perform anaerobic fermentation at a temperature of 35° C. for 4 days to obtain combined pretreatment activated sludge.

[0029] After testing, the SCFA content was 4356.5 mg / l (high performance liquid chromatography), and the SCOD content was 7140.3 mg / l.

Embodiment 2

[0031] A method for joint pretreatment of activated sludge to produce short-chain fatty acids, comprising the steps of:

[0032] (1) 1L of activated sludge was irradiated with γ-rays, the irradiation intensity was 25kGy, and the irradiation time was 8s to obtain the sludge after γ-ray irradiation;

[0033] (2) The γ-ray irradiated sludge obtained in step (1) is subjected to ultrasonic treatment, the ultrasonic frequency is 30KHz, the ultrasonic sound energy density is 1.1W / mL, and the treatment time is 40min to obtain the ultrasonically treated sludge;

[0034] (3) Adjust the pH value of the ultrasonically treated sludge obtained in step (2) to 9.5, and perform anaerobic fermentation at a temperature of 35° C. for 4 days to obtain combined pretreatment activated sludge.

[0035] After testing, the SCFA content was 3977.8 mg / l (high performance liquid chromatography), and the SCOD content was 6850.1 mg / l.

Embodiment 3

[0037] A method for joint pretreatment of activated sludge to produce short-chain fatty acids, comprising the steps of:

[0038] (1) 1L of activated sludge is irradiated with γ-rays, the irradiation intensity is 7.5kGy, and the irradiation time is 12s, and the sludge after γ-ray irradiation is obtained;

[0039] (2) The γ-ray irradiated sludge obtained in step (1) is subjected to ultrasonic treatment, the ultrasonic frequency is 40KHz, the ultrasonic sound energy density is 1.2W / mL, and the treatment time is 20min to obtain the ultrasonically treated sludge;

[0040] (3) Adjust the pH value of the ultrasonically treated sludge obtained in step (2) to 10.5, and perform anaerobic fermentation at a temperature of 35° C. for 4 days to obtain combined pretreatment activated sludge.

[0041] After testing, the SCFA content was 4218.4mg / l (high performance liquid chromatography), and the SCOD content was 6943.3mg / l.

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Abstract

The invention relates to a method for producing a short-chain fatty acid employing combined pretreatment of activated sludge. The method comprises the following steps: (1) carrying out gamma-ray irradiation on activated sludge, so as to prepare gamma-ray irradiated sludge; (2) carrying out ultrasonic treatment on the gamma-ray irradiated sludge, so as to prepare ultrasonic-treated sludge; and (3) adjusting the pH value of ultrasonic-treated sludge, carrying out anaerobic fermentation, so as to prepare the combined pretreated activated sludge. After the activated sludge is subjected to gamma-ray irradiation and ultrasonic treatment, organic matters such as protein and polysaccharide in the sludge dissolved into water can be significantly improved, so that an abundant organic matrix which can be dissolved into water is provided for fermentation and acidogenesis of sludge; the acid production rate of the sludge is improved; the anaerobic fermentation time of the sludge is shortened; and the method has important significance in improvement and optimization of an existing sludge treatment system, energy conservation and consumption reduction, and reduction of the operation cost.

Description

technical field [0001] The invention relates to a method for combined pretreatment of activated sludge to produce short-chain fatty acids, belonging to the technical field of biotechnology. Background technique [0002] Improving the sewage collection rate and treatment rate is an important goal of my country's water environment protection. With the increase of sewage treatment rate, the problem of excess sludge treatment has attracted more and more attention: on the one hand, the annual sludge treatment and disposal The cost is increasing at an alarming rate, and at the same time it brings serious secondary pollution problems; on the other hand, many useful resources (especially carbon sources) in the sludge are wasted in vain. In theory, it should be degraded Afterwards, it can be used by certain microorganisms to grow and use, thereby reproducing the use value. Therefore, the use of reasonable treatment methods to achieve sludge recycling and reduction cannot be ignored. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04C12P7/54C12P7/52C12P7/40
CPCC02F11/00C02F11/04C12P7/40C12P7/52C12P7/54
Inventor 李强宋冬雪李玉梅王艺伟郝大魁杨敏胡志恒
Owner UNIV OF JINAN
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