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Method for evaluating toxicity and biodegradability of chemical wastewater

A technology for chemical wastewater and evaluation methods, applied in the direction of testing water, material inspection products, etc., can solve the problems of inability to measure the toxicity of organic substances, inability to characterize the degree of toxicity of wastewater, and long detection period, achieving convenient and accurate determination and short determination time. , the effect of strong practicability

Inactive Publication Date: 2017-09-22
NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] According to the existing water quality index (BOD) for evaluating the biodegradability of wastewater 5 ) has the problems of long detection period, cumbersome detection, large error, and inability to characterize the degree of toxicity of wastewater, and the COD index can only represent the equivalent of organic matter in wastewater, and cannot measure the toxicity of organic matter. The present invention is based on the principle of activated sludge biochemical respiration , providing an evaluation method for the toxicity and biodegradability of chemical wastewater

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  • Method for evaluating toxicity and biodegradability of chemical wastewater
  • Method for evaluating toxicity and biodegradability of chemical wastewater
  • Method for evaluating toxicity and biodegradability of chemical wastewater

Examples

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Effect test

Embodiment 1

[0049] The effluent from the wastewater treatment station of a pharmaceutical factory in a chemical industry park, the effluent from the wastewater treatment station of a dye factory, and the effluent from a pesticide factory wastewater treatment station were selected for biodegradability and toxicity testing. The determination steps are as follows:

[0050] (1) pharmaceutical wastewater, dye wastewater, pesticide wastewater are diluted to the same CODcr, and the present embodiment is diluted to 200mg / L;

[0051] (2) Fully oxygenate the diluted water and the diluted pharmaceutical wastewater, dye wastewater, and pesticide wastewater at 20°C and adjust the pH to 7.5;

[0052] (3) Mix the above four kinds of water with the domesticated and cleaned sludge in equal proportions, and adjust the sludge concentration to 4g / L;

[0053] (4) Use the PF-8000 sludge respiration instrument produced by the U.S. RSA company with ISO standards to draw oxygen consumption curves for endogenous ...

Embodiment 2

[0056] The waste water from different sections of the wastewater treatment station of a pesticide factory was selected for biodegradability and toxicity test. The process of this wastewater treatment station adopts the process of UASB section + O section. L, 298mg / L. The determination steps are as follows:

[0057] (1) Dilute the CODcr of UASB inlet and outlet water to 300mg / L respectively;

[0058] (2) Fully oxygenate the dilution water, UASB inlet and outlet water, and O-stage outlet water at 20°C and adjust the pH to 7.5;

[0059] (3) Mix the above four kinds of water with the domesticated and cleaned sludge in equal proportions, and adjust the sludge concentration to 4g / L;

[0060] (4) Use the PF-8000 sludge respiration instrument produced by the U.S. RSA company with ISO standards to draw oxygen consumption curves for endogenous respiration and biochemical respiration, and calculate the S in the reaction time. TOD value.

[0061] (5) if figure 2 As shown, UASB inlet...

Embodiment 3

[0063] The effluent water from the wastewater treatment station of a pesticide factory in a chemical industry park is toxic and has a toxic effect on the operation of the takeover sewage plant. It needs advanced oxidation pretreatment before entering the takeover sewage plant. 3 The biochemical and toxicity degree of the oxidized effluent is identified, and the steps are as follows:

[0064] (1) the wastewater treatment station effluent, O 3 After oxidation, the effluent is fully oxygenated at 20°C and the pH is adjusted to 7.5;

[0065] (2) Mix the above two kinds of water with the domesticated and cleaned sludge in equal proportions, and adjust the sludge concentration to 4g / L;

[0066] (3) Use the PF-8000 sludge respiration instrument produced by the U.S. RSA company with ISO standards to draw oxygen consumption curves for endogenous respiration and biochemical respiration, and calculate the S in the reaction time. TOD value.

[0067] (5) if image 3 As shown, the waste...

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Abstract

The invention discloses a method for evaluating the toxicity and the biodegradability of chemical wastewater and belongs to the field of water pollution control. Relative oxygen consumption is adopted to evaluate the biodegradability and the toxicity of chemical wastewater: (1) if STOD of a water sample to be detected is larger than 1, a matrix in wastewater has no toxicity and is biodegradable, and the larger the STOD value is, the better the biodegradability is; (2) if STOD of the water sample to be detected is equal to 1, the matrix in wastewater has no toxicity but is non-degradable; and (3) if STOD of the water sample to be detected is smaller than 1, the matrix in wastewater has toxicity and is non-degradable, and the smaller the STOD value is, the stronger the toxicity is. A method for measuring the oxygen consumption and the oxygen uptake rate of microbes in real time is adopted, so that errors caused by adopting a dilution multiple method to measure BOD5 are avoided, the problem that BOD5 cannot evaluate the toxicity of wastewater is solved, and the method provided by the invention is convenient and quick and can acquire measurement results within 20 min.

Description

technical field [0001] The invention belongs to the field of water pollution control, and more specifically relates to a method for evaluating the toxicity and biodegradability of chemical wastewater, which is especially suitable for the reduction of toxic substances in chemical industry parks and the separation and treatment of wastewater. Background technique [0002] At present, the sewage plants taken over by the chemical industry park, especially the sewage plants without domestic sewage, are generally difficult to meet the discharge standards. The part of the sewage discharged by the chemical enterprise treatment station contains toxic, harmful and refractory pollutants that are not conducive to biochemistry. Such sewage plants cannot meet the standards. reason. Wastewater in chemical industry parks is diverse, with thousands of toxic pollutants and refractory organic substances. The existing takeover standards cannot fully cover, let alone detect and demonstrate each ...

Claims

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Application Information

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IPC IPC(8): G01N33/18
CPCG01N33/18
Inventor 李鹏章李爱民戴建军邢立群周腾腾
Owner NANJING UNIV YANCHENG ENVIRONMENTAL PROTECTION TECH & ENG RES INST
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