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A method for synthesizing biodegradable plastics from aerobic granular sludge

A technology of aerobic granular sludge and synthetic organisms, applied in the direction of fermentation, can solve problems such as collapse, poor reactor stability, sludge bulking, etc., and achieve the effects of not easy filamentous bacteria bulking, fast synthesis speed, and stable performance.

Active Publication Date: 2016-04-27
哈尔滨工业大学高新技术开发总公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that sludge bulking easily occurs in the current synthetic PHA method, resulting in poor stability of the reactor and the problem of final collapse, and a method for synthesizing biodegradable plastics using aerobic granular sludge

Method used

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  • A method for synthesizing biodegradable plastics from aerobic granular sludge
  • A method for synthesizing biodegradable plastics from aerobic granular sludge

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specific Embodiment approach 1

[0017] Specific embodiment one: a kind of method of using aerobic granular sludge to synthesize biodegradable plastics of the present embodiment, it is carried out according to the following steps:

[0018] 1. Put the activated sludge in the SBR reactor with a height-to-diameter ratio of 10:1, so that the sludge concentration in the reactor reaches 3000-5000mg / L;

[0019] 2. The SBR reactor is operated with a cycle of 6 to 8 hours. The operation process of one cycle of the SBR reactor is as follows: after the water inflow is completed, the temperature of the SBR reactor is 23°C to 27°C. Aeration, after the dissolved oxygen in the SBR reactor jumps from 2 to 3mg / L to 6 to 7mg / L, continue to aerate until 30 minutes before the end of the current cycle, stop the aeration, then carry out precipitation for 3 to 5 minutes, and drain water; Among them, the incoming water contains carbon source, nitrogen source and phosphorus source, its chemical oxygen demand is 5000-10000mg / L, and th...

specific Embodiment approach 2

[0025] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 2, aeration is started when the temperature of the reactor is 25°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the carbon sources are all small molecule organic acids. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method of synthesizing biodegradable plastic by adopting aerobic granular sludge, and relates to a method of synthesizing biodegradable plastic by adopting sludge. The method disclosed by the invention aims to solve the problem that in an existing PHA (Polyhydroxyalkanoates) synthesizing method, sludge bulking is easy to happen to lead to poor stability of a reactor to finally cause breakdown. The method disclosed by the invention comprises the following steps: I, placing activated sludge in an SBR (Sequencing Batch Reactor); II, taking 6-8 hours as a cycle of operations, including inflowing, aerating, precipitating and draining, wherein the drainage ratio is 1:1, wherein inflowing comprises a carbon source and nutritional substances; III, operating 3-4 cycles per day, and collecting a sludge and water mixed liquid wherein the sludge retention time is 1-10 days; and IV, carrying out batch experiments, discharging half of the supernate, supplementing the carbon source in equal amount, aerating, precipitating and draining, and repeating the operations for 6-8 times to realize the method. The method disclosed by the invention belongs to the field of synthesizing the biodegradable plastic.

Description

technical field [0001] The invention belongs to the field of utilization of municipal sludge resources and synthesis of biodegradable plastics, and in particular relates to the synthesis of polyhydroxyalkanoates (PHAs) by adopting an SBR aerobic process to domesticate aerobic granular sludge. Background technique [0002] Polyhydroxyalkanoates (PHAs or PHAs for short) are a class of lipid polymers synthesized by a variety of prokaryotic microorganisms under unbalanced nutritional conditions and stored in cells. They accumulate carbon sources in microbial metabolism. Balance the role of intracellular and extracellular ions. Its chemical and physical properties are similar to chemically synthesized plastics, and PHA can be completely decomposed and utilized by microorganisms in nature. It is a new type of environmentally friendly material with great application prospects and development value. It is expected to solve the current widespread white pollution problem. [0003] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/62
Inventor 陈志强郭子瑞温沁雪黄龙杜茂安
Owner 哈尔滨工业大学高新技术开发总公司
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