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Biological removal method of acute biological toxicity in ozonation process

A biological toxicity and process technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of secondary pollution of activated carbon and high disposal cost, and achieve simple operation and low cost , remove the effect of acute biological toxicity

Inactive Publication Date: 2019-04-12
NANJING UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

However, improper disposal of activated carbon after adsorption is likely to cause secondary pollution, and the disposal cost is high (Rozas O, Baeza C, K, etal.Organic micropollutants(OMPs)oxidation by ozone:Effect of activated carbonon toxicity abatement[J].Science of the Total Environment,2017,590:430.)

Method used

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  • Biological removal method of acute biological toxicity in ozonation process
  • Biological removal method of acute biological toxicity in ozonation process
  • Biological removal method of acute biological toxicity in ozonation process

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Embodiment 1

[0023] (1) Use ozone with a concentration of 35mg / L and a flow rate of 0.5L / min to treat 40mg / L of 3-chlorophenol for 20min under the condition of pH=7, and take water samples with different ozone oxidation times for acute biological toxicity removal. (T0, T2, T4 and T20 represent the water samples when ozone was oxidized for 0, 2, 4 and 20 minutes).

[0024] (2) Take the mixed liquid from the aeration tank of the sewage treatment plant and aerate it continuously and fully for 48 hours, so that the microorganisms in the activated sludge can completely consume the nutrients in the sludge and enter the endogenous respiration period.

[0025] (3) Add 200mL of 3-chlorophenol ozonated solution into a 250mL conical flask, according to the sludge MLSS, get 0.6g of corresponding volume of sludge, use a centrifuge to concentrate, pour off the supernatant, add to the conical flask, The concentration of MLSS in the bottle is 3000mg / L. Mix the water samples treated with different ozone o...

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Abstract

The invention discloses a biological removal method of the acute biological toxicity in an ozonation process. The method comprises the steps that a mixed liquid from an aeration tank of a sewage treatment plant is obtained and subjected to aeration, so that the mixed liquid comes into an endogenous respiration stage; afterwards, the mixed liquid is mixed with high-acute-biological-toxicity waste water generated through ozonation, nitrogen, phosphorus and trace elements are added, shake culture is conducted at room temperature, and removal of the acute toxicity generated in the ozonation process is achieved. According to the method, the sludge in the endogenous respiration stage has a good removal effect on the highly acute biological toxicity generated in the ozonation process, and the treated sludge has a higher metabolic activity on a non-malignant substrate.

Description

technical field [0001] The invention belongs to the technical field of waste water biological toxicity removal, and relates to a method for biological removal of acute biological toxicity in an ozone process. Background technique [0002] The ozone oxidation process has been widely used in advanced sewage treatment, such as advanced treatment and reuse of effluent from sewage plants, disinfection of drinking water, decolorization and deodorization of wastewater, and other fields due to its rapid response, simple process, and no secondary pollution problems. With the development of the ozone process, this process is gradually applied to the pretreatment of highly toxic and refractory biodegradable wastewater, such as coal chemical wastewater, pharmaceutical manufacturing wastewater, and chemical wastewater. The use of ozone process can quickly reduce biological toxicity, improve biodegradability, and increase the possibility of further biodegradation. However, the partial ox...

Claims

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Application Information

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IPC IPC(8): C02F3/34
CPCC02F3/34
Inventor 马德华张洪波王连军沈锦优孙秀云魏建建
Owner NANJING UNIV OF SCI & TECH
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