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Method for producing acid through promoting anaerobic fermentation of residual sludge by virtue of rhamnolipid biosurfactant

A rhamnolipid, excess sludge technology, applied in microorganism-based methods, biochemical equipment and methods, fermentation and other directions, can solve the secondary pollution of excess sludge, weak acidification of excess sludge, chemical surfactants There are problems such as toxicity, to achieve the effect of eliminating secondary pollution, good biodegradability and environmental friendliness

Inactive Publication Date: 2012-11-28
HARBIN INST OF TECH
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Problems solved by technology

[0004] In order to solve the problem that the chemical surfactant in the existing method of promoting the anaerobic fermentation acid production of surplus sludge by chemical surfactant has toxicity, and cannot biodegrade and cause secondary pollution to surplus sludge, the chemical surfactant 12 Sodium alkyl sulfate and sodium dodecylbenzene sulfonate have weak acidifying effects on excess sludge, and a rhamnolipid biosurfactant is provided to promote the production of acid by anaerobic fermentation of excess sludge

Method used

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  • Method for producing acid through promoting anaerobic fermentation of residual sludge by virtue of rhamnolipid biosurfactant
  • Method for producing acid through promoting anaerobic fermentation of residual sludge by virtue of rhamnolipid biosurfactant
  • Method for producing acid through promoting anaerobic fermentation of residual sludge by virtue of rhamnolipid biosurfactant

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specific Embodiment approach 1

[0015] Specific embodiment one: the method that the rhamnolipid biosurfactant of the present embodiment promotes the anaerobic fermentation of excess sludge to produce acid is specifically carried out according to the following steps:

[0016] 1. Put the remaining sludge into a container for natural settlement at a temperature of 4°C for 24-30 hours, then drain the supernatant to obtain a sludge sample;

[0017] 2. Put the sludge sample into the reaction bottle, add rhamnolipid, and the dosage of rhamnolipid is 0.005~0.10g / gVSS;

[0018] 3. After deoxygenating and filling the reaction bottle with nitrogen for 10 minutes, seal the reaction bottle and place it in an air bath shaker at a speed of 100-110rpm / min for anaerobic fermentation. The fermentation temperature is 35-38°C and the fermentation time is 96-192h. , to complete the process in which the rhamnolipid biosurfactant promotes the anaerobic fermentation of excess sludge to produce acid.

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the residual sludge in step 1 contains Clostridium spp. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that: the settling time in step 1 is 25-29 hours. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention discloses a method for producing acid through promoting anaerobic fermentation of residual sludge by virtue of a rhamnolipid biosurfactant, and the method is used for solving the problems that in the existing method for producing acid through promoting the anaerobic fermentation of the residual sludge by virtue of a chemical surfactant, the chemical surfactant is toxic, can not be biodegraded and can cause the secondary pollution of the residual sludge, and the acidifying effects of the chemical surfactants sodium dodecyl sulfate and sodium dodecyl benzene sulfonate on the residual sludge are weak. The method comprises the following steps of: 1, preparing a sludge sample; 2, adding rhamnolipid; and 3, carrying out anaerobic fermentation. According to the invention, the rhamnolipid biosurfactant is good in biodegradability and environmental friendliness, can be used for gradually eliminating the toxicity and secondary pollution of the residual sludge and has the great promotion effect of acid production by the fermentation of the residual sludge. The method disclosed by the invention is used for promoting acid production by the anaerobic fermentation of the residual sludge.

Description

technical field [0001] The invention relates to a method for promoting acid production by anaerobic fermentation of excess sludge with a surfactant. Background technique [0002] The continuous and rapid development of the national economy has led to an increase in the discharge of urban domestic sewage year by year, and the treatment efforts are bound to increase accordingly. By the end of 2008, 1,519 urban sewage treatment plants had been built and put into operation across the country, 86.2% of which used the activated sludge process, with an average water volume of about 66.998 million m 3 / d. However, a large amount of residual sludge is produced in the process of sewage treatment. In 2008, the amount of excess sludge produced in the country was as high as 18 million tons per year (80% water content), and then increased rapidly at a rate of 10% per year. The cost of treatment and disposal usually accounts for 20-50% of the total operating cost of sewage treatment, or ...

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Application Information

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IPC IPC(8): C12P1/04C12R1/145
Inventor 王爱杰周爱娟郭泽冲杜静雯
Owner HARBIN INST OF TECH
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