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A method for synthesizing polyhydroxyalkanoate by using water to treat excess sludge

A polyhydroxyalkanoate, excess sludge technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problem of large excess sludge output and cannot fundamentally reduce excess sludge Sludge, high moisture content, high yield, simple device and good operation stability

Inactive Publication Date: 2011-12-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A method for synthesizing polyhydroxyalkanoate by using water to treat excess sludge
  • A method for synthesizing polyhydroxyalkanoate by using water to treat excess sludge

Examples

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Effect test

Embodiment 1

[0014] Embodiment 1: a kind of method of utilizing sludge to synthesize polyhydroxyalkanoate of the present invention, method step is 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. The ratio of phosphorus source is 100:5:1, adjust the nutrient ratio and pH, prepare the culture medium, activate and stabilize the excess sludge;

[0016] Step 2: Sludge activity recovery and biological selection stage: first run in complete aerobic mode, aerate for 5-7 days, wait until the sludge is in good condition, the color turns from brown black to light yellow, and after the activity is stable, enter The next cycle of domestication process, the purpose of this process is to restore biological activity as soon as possible, through balanced nutrition and long-t...

Embodiment 2

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

[0020] In the high-concentration organic wastewater treatment process, the first step is often treated by anaerobic hydrolysis acidification, fermentation and other processes. The COD of the effluent of these processes is still high and rich in a large number of small molecule organic acids. By adjusting the pH value and nutrient ratio, These organic acids can be used as good substrates for microorganisms to be cultivated, and the microorganisms can be domesticated to synthesize PHA.

[0021] The currently known bacteria with the ability to synthesize PHA are widely distributed, covering various genera such as Bacillus, Pseudomonas, and photosynthetic bacteria. The activated sludge used in the sewage treatment process of the sewage plant is a kind of In the stable biome system of metazoans, there are many PHA-synthesizing bacteria, but under the usual sewage treatment process conditions, the ability...

Embodiment 3

[0022] Example 3: Binding figure 1 , the device for realizing the method of the present invention such as figure 1 As shown, the device adopts an automatic control system, using a time controller (TIME) to control the inflow and outflow of water and the aerobic aeration process, and at the same time monitor 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 using waste water rich in small molecular 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 plastics to human beings, conventional chemical plastic production consumes a lot of non-renewable energy such as petroleum. similar substances, while its stable chemical properties lead to serious white pollution. To completely solve these two problems, it is necessary to find an environmentally friendly material that is easy to synthesize and can be naturally decomposed in nature. Polyhydroxyalkanoate PHA is expected to become this ideal material. However, this substance is usually found in microbial cell intrapolymers. A small number of industrial-scale productions ma...

Claims

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Application Information

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Patent Type & Authority Patents(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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