Method for synthesizing polyhydroxy alkanoates by excess sludge in water treatment

A polyhydroxyalkanoate and excess sludge technology, which is applied in biological water/sewage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of not fundamentally reducing excess sludge and high moisture content , large excess sludge output and other problems, to achieve high yield, simple device, and good operation stability

Inactive Publication Date: 2010-06-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disposal of excess sludge in urban sewage plants is an important issue in the operation of sewage plants. The excess sludge has a large output and high water content. Conventional concentration and dehydration treatments cannot fundamentally reduce excess sludge

Method used

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  • Method for synthesizing polyhydroxy alkanoates by excess sludge in water treatment
  • Method for synthesizing polyhydroxy alkanoates by excess sludge in water treatment

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Effect test

Embodiment 1

[0014] Embodiment 1: a method for synthesizing polyhydroxyalkanoate by utilizing sludge of the present invention, the method steps are as follows:

[0015] Step 1: Activated sludge inoculation: take the remaining activated sludge from the sewage plant and put it into the SBR reactor. According to the general law of microbial growth, the organic acid waste liquid rich in small molecules is used as the carbon source. Under the condition that the ratio of phosphorus source is 100:5:1, adjust the nutrient ratio and pH, prepare the culture solution, and activate and stabilize the excess sludge;

[0016] Step 2: Sludge activity recovery and biological selection stage: First run with complete aerobic aeration for 5-7 days. When the sludge is in good condition, the color changes from brown to light yellow, and the activity is stable, enter the In the next cycle of domestication, the purpose of this process is to restore biological activity as soon as possible. Through balanced nutriti...

Embodiment 2

[0019] Embodiment 2: the implementation process of the inventive method is as follows:

[0020] In the high-concentration organic wastewater treatment process, the first step is usually anaerobic hydrolysis, acidification, fermentation and other processes. The effluent of these processes is still high in COD and rich in a large amount of small molecular organic acids. These organic acids can be cultivated as good substrates available to microorganisms to domesticate microorganisms to synthesize PHA.

[0021] The currently known bacteria with the ability to synthesize PHA are widely distributed, covering a variety of genera such as Bacillus, Pseudomonas, and photosynthetic bacteria. There are many PHA-synthesizing bacteria in the stable biological community system of metazoans, but under the usual sewage treatment process conditions, the ability of these bacteria to synthesize PHA is inhibited and cannot synthesize PHA in large quantities. Inoculate the excess sludge into the ...

Embodiment 3

[0022] Example 3: Combination figure 1 , the device for realizing the method of the present invention is such as figure 1 As shown in the figure, the device adopts an automatic control system, which uses a time controller to control (TIME) the process of entering and leaving water and aerobic aeration, and simultaneously monitors its pH, dissolved oxygen (DO) and other parameters online.

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Abstract

The invention provides a method for synthesizing polyhydroxy alkanoates by excess sludge in water treatment, which takes into consideration of technological features of high-concentration organic acid waste water treatment, microorganism synthesis PHA treatment and sewage plant remaining sludge treatment, realizes high-concentration organic-acid-containing waste water treatment and reduces remaining sludge output. The method comprises the following steps: inoculating active sludge, restoring active sludge and biological selection phase; acclimatizing and accumulating PHA; discharging a batch of PHA-rich active sludge for extracting PHA. The leading characteristic of the method is simple and rapid, acclimatization process for each batch of inoculated sludge lasts no more than 15-30 days; the equipment is simple and the method can be realized by a single SBR reactor; in addition acclimatization process and accumulation process are synchronous; as for urban sewage plant secondary sludge, normal PHA content accounts for more than 30% of dry cell weight; furthermore, operation stability is good and an anaerobic selection process section is provided for ensuring stability of the reactor, so as to inhibit propagation of filamentous fungus to prevent sludge from bulking and collapsing.

Description

(1) Technical field [0001] The invention relates to water treatment technology, in particular to a method for synthesizing polyhydroxyalkanoate by utilizing waste water rich in small-molecule organic acids to treat excess sludge. (2) Technical background [0002] With the development of society and technology, plastic products have played an irreplaceable role in life. While enjoying the convenience brought by plastic to human beings, conventional chemical plastic production consumes a lot of non-renewable energy such as petroleum. At the same time, its stable chemical properties lead to serious white pollution. To completely solve these two problems, we need to find an environmentally friendly material that is easy to synthesize and can be decomposed naturally in nature. A small number of industrial-scale production of PHA mainly relies on the synthesis of PHA by pure bacterial fermentation. The conditions are harsh and the cost is high. At present, it can only be used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/89C08G63/06C02F3/12C02F11/00
CPCY02W10/10
Inventor 陈志强陈玮温沁雪吕炳南
Owner HARBIN INST OF TECH
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