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Method for promoting halophilic activated sludge flora to secrete extracellular polymeric substances

An extracellular polymer, activated sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, and adding compounds to stimulate growth, etc., can solve the problems of small sedimentation of halophilic sludge flocs. , to achieve the effect of small investment in project implementation, various forms and simple operation

Active Publication Date: 2020-09-04
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to increase the EPS secretion of halophilic activated sludge to solve the problems of small halophilic sludge flocs and poor settling properties in the biological treatment of high-salt wastewater

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  • Method for promoting halophilic activated sludge flora to secrete extracellular polymeric substances
  • Method for promoting halophilic activated sludge flora to secrete extracellular polymeric substances
  • Method for promoting halophilic activated sludge flora to secrete extracellular polymeric substances

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Embodiment Construction

[0031] The technical implementation of the present invention is further described in conjunction with the accompanying drawings and the following examples, and the present invention is not limited to the following examples.

[0032]The batch-type halophilic activated sludge process treats high-salt wastewater in the SBR reactor (3). The operation process of the system is as follows: in the water intake stage, the high-salt domestic wastewater with a salinity of 3% in the raw water tank (1) is injected into the SBR reactor (3) through the water intake peristaltic pump (2). In the aeration stage, the aeration device (3.1) is turned on, and the air is sent to the aeration pan (3.3) through the connecting pipeline and forms tiny bubbles into the reactor. Adjust the gas flow meter (3.2) to control the gas flow rate at 2L / min, and maintain the dissolved oxygen in the range of 3-4mg / L. The aeration phase lasted 4 h. In the aeration stage, the temperature in the SBR reactor (3) is r...

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Abstract

The invention discloses a method for promoting halophilic activated sludge flora to secrete extracellular polymeric substances, belongs to the field of sewage treatment, and particularly relates to high-salinity wastewater biological treatment. Calcium and magnesium ions are added into a halophilic activated sludge system to increase the size of flocculating constituents of halophilic activated sludge and improve settling performance. Calcium and magnesium ion concentrated solution is added into the halophilic activated sludge system, biological selection pressure is applied to microorganismsin the system, and the microorganisms of Flavobacteriaceae in the halophilic sludge can rapidly multiply to become dominant species due to accumulation of the calcium ions. Flavobacteriaceae halophilic bacteria have high EPS (extracellular polymeric substance) secretion capacity, so that EPS of the halophilic activated sludge is improved. In addition, bridging functions among the calcium ions, themagnesium ions and the EPS can be enhanced, and connection among the extracellular polymeric substances and the microorganisms is promoted. The size of the flocculating constituents of the halophilicactivated sludge and the settling performance are greatly improved.

Description

technical field [0001] The present invention proposes a method for promoting the secretion of extracellular polymeric substance (EPS) from halophilic activated sludge flora, increasing the floc size of halophilic activated sludge, thereby solving the process of treating salty wastewater by halophilic activated sludge Difficulty in separating mud from water. The invention belongs to the field of sewage treatment, especially the biological treatment of high-salt wastewater. Background technique [0002] Biological method is a cost-effective method for treating saline wastewater. Since traditional freshwater microorganisms cannot survive in a high-salt environment, they cannot be applied to the biological treatment of high-salt wastewater. The halophilic microorganisms in nature have an osmotic pressure regulation mechanism and can survive in a high-salt environment, so they can be used for biological treatment of saline wastewater. For example, Patent Application No. CN1066...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/38C02F3/34
CPCC12N1/38C02F3/34
Inventor 崔有为黄基霖
Owner BEIJING UNIV OF TECH
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