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Sludge micro oxygen hydrolytic acidizing method

A technology of hydrolysis acidification and sewage treatment plant, which is applied in the field of sludge treatment and resource utilization, which can solve the problems of easy sedimentation of sludge and achieve good results, increase production and inhibit growth

Inactive Publication Date: 2012-07-18
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] [Shanghai Environmental Science, 1995, 14(11): 15-16] carried out research on the micro-aerobic digestion process of excess sludge. The sludge reduction effect is good, but because only air stirring is used, the sludge is easy to digest. Deposited at the bottom, there is no accumulation of high-concentration volatile acids

Method used

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  • Sludge micro oxygen hydrolytic acidizing method

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Experimental program
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Effect test

Embodiment 1

[0029] The hydrolytic acidification reactor adopts a sequencing batch reactor, and the return sludge from the aeration tank of the sewage treatment plant is inoculated into the sequencing batch reactor, and the amount of inoculated sludge is 60% of the reactor volume. After inoculation, add carbohydrate organic waste water as the medium, carry out mechanical stirring and air stirring in the sequencing batch reactor at room temperature, both at the same time, stirring once every 60 minutes, each stirring time is 5 minutes, and the mechanical stirring intensity is 10W / m 3 , the volume of air stirred by air is 0.06m 3 / m 3 Pool capacity min, to maintain the micro-aerobic condition where the DO in the reactor is 0.4mg / L. The cultivation and acclimatization of acid-producing bacteria generally takes 7 to 14 days. No sludge is discharged during the cultivation process. The supernatant is discharged after the stirring is stopped and allowed to settle for 1 hour every day, and at t...

Embodiment 2

[0033] The stirring interval time is 60min, the stirring time is 7min, the SRT is 4d, and the others are the same as in Example 1.

Embodiment 3

[0035] The stirring interval is 40 minutes, the stirring time is 5 minutes, the VS entering the sludge is 20g / L, VS / TS=0.55, and the SRT is 3d. The pH value in the reactor is naturally maintained by the acid-producing bacteria in the reactor and the volatile acid and alkalinity produced by it. At 6.0, others are the same as in Example 1.

[0036] The volatile acid concentration in the mud-water mixture after hydrolysis and acidification treatment was 2693mg / L, the acid production of sludge was 0.14gVFA / gVS, and the removal rate of VS was 35%.

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Abstract

The invention relates to a sludge micro oxygen hydrolytic acidizing method, which includes: inoculating sludge containing acid-producing bacteria in a hydrolytic acidizing reactor, intermittently inputting air to the middle of the hydrolytic acidizing reactor for air stirring, simultaneously supplementing intermittent mechanical stirring, performing hydrolytic acidizing on sludge of a sewage treatment plant under micro oxygen conditions with dissolved oxygen (DO) kept to be 0.4-0.8 mg / L, leading the sludge after hydrolytic acidizing treatment to enter a settling pond for sludge-water separation, and leading liquid supernatant to serve as carbon sources for municipal sewage biological de-nitrification and dephosphorization treatment. The sludge micro oxygen hydrolytic acidizing method is conducted at normal temperature, is not needed to be added with acid and alkali for adjusting potential of hydrogen (pH) value, is simple in operation, stable in running and capable of restraining growth of methane bacteria and improving stability of a sludge hydrolytic acidizing system, and simultaneously leads sludge to obtain reduction and stabilization treatment to the maximum extent. Sludge acid yield is improved by 38%-50%.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and resource utilization, and relates to a treatment method for sewage treatment plant sludge, in particular to a microaerobic hydrolysis acidification treatment method for sewage treatment plant sludge. Background technique [0002] Sludge from sewage treatment plants is hydrolyzed and fermented under anaerobic conditions to produce short-chain volatile acids such as acetic acid, propionic acid, and butyric acid. Using the acidic fermentation product of sludge as the carbon source of denitrifying bacteria and phosphorus accumulating bacteria can reduce the cost of sewage treatment, and can reduce and recycle sludge in sewage plants. [0003] Since the 1980s, there have been more and more studies abroad on the hydrolysis and acidification stage of anaerobic digestion, most of which use the primary sedimentation tank sludge hydrolysis fermentation of sewage treatment plants to produce vola...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 宋秀兰李亚新冀文侃
Owner TAIYUAN UNIV OF TECH
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