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Method for pretreating waste water containing emerging pollutants by adopting oxidation of calcium peroxide

A technology for calcium peroxide and wastewater treatment, applied in the fields of oxidized water/sewage treatment, chemical instruments and methods, precipitation treatment, etc. Toxic substance content, increase bioavailability, reduce ecotoxicity effect

Inactive Publication Date: 2019-01-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The octanol coefficient of most PPCPs is relatively high, and it is difficult to degrade in the environment. Once it enters the environment, it is easy to be enriched by biosorption and absorbed by the human body. It is potentially harmful to aquatic ecological animals and plants as well as human life and health.
2. Endocrine Disruption
3. Other ecotoxicity
Membrane biological reactions are mainly used for the removal of hydrophobic PPCPs, and the operating costs are relatively high, so there are few practical engineering applications for the removal of PPCPs
3. Adsorption test of activated carbon and other materials. This technical method cannot degrade organic matter, but the pollutants are adsorbed on the surface of the material, and have not been completely removed from the environment.
However, the decomposition methods of calcium peroxide are different, and complex environmental conditions have a great influence on the hydrolysis and decomposition characteristics of calcium peroxide, making it decompose H 2 o 2 different rates of production

Method used

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  • Method for pretreating waste water containing emerging pollutants by adopting oxidation of calcium peroxide
  • Method for pretreating waste water containing emerging pollutants by adopting oxidation of calcium peroxide
  • Method for pretreating waste water containing emerging pollutants by adopting oxidation of calcium peroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Use 20L of simulated domestic sewage, in which the simulated wastewater contains nonylphenol and triclocarban pollutants, the concentrations are 1mg / L and 1.5mg / L respectively; ammonium chloride is used to simulate the ammonia nitrogen in the sewage, and potassium dihydrogen phosphate is used to simulate the sewage Moderately soluble phosphate, the influent COD is 300mg·L -1 , TN is 30mg·L -1 , TP is 10mg·L -1 . Before the simulated wastewater enters the bioreactor, it is pretreated with calcium peroxide. The dosage of calcium peroxide is 0.5g / L, and the pH is adjusted to 8±0.1. The concentrations of phenol and triclocarban are 0.12mg / L and 0.375mg / L, indicating that calcium peroxide has degraded 88 ± 1.1% and 75 ± 0.9% of nonylphenol and triclocarban respectively. The waste water enters the biological reaction system for further reaction. By adopting the operating technical means of the present invention, the removal rate of TN in the final system effluent is 90.89±...

Embodiment 2

[0036] According to the steps and operation methods described in Example 1, domestic wastewater actually containing high-concentration estradiol pollutants was treated. The COD content in this wastewater is 150-170mg·L -1 , TN is 36.8~40.25mg·L -1 , TP is 8.7~9.6mg·L -1 , The concentration of estradiol in the wastewater is 1.5±0.87mg / L, and the influent volume of 20L of actual wastewater is also used, the dosage of calcium peroxide is 0.5g / L, and the pH is adjusted at 8±0.5. After directly entering the biological reaction system without calcium peroxide pretreatment, the concentration of nonylphenol in the effluent is 0.52±0.07mg / L, the content of nonylphenol in the sludge is 0.87±0.09mg / L, and the removal rate of TN and TP 90.2±2.3% and 92.4±0.1%, respectively. And adopt the experimental procedure of the present invention to process, experimental result is as follows: the removal rate of TN is 94.2 ± 1.5%, the removal rate of TP is 95.2 ± 3.1%, and the final effluent conce...

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Abstract

The invention belongs to the technical field of environmental toxicology and ecological restoration, and particularly discloses a method for pretreating and degrading emerging pollutants in waste water by adopting a new oxidizing agent. The method comprises the steps that waste water containing the emerging pollutants passes through an adjusting pond before entering a traditional biological treating system, and then through a traditional treating measure, the pollutants in the waste water are finally removed to achieve safe discharging. Calcium peroxide of a certain amount is thrown in the adjusting pond, by adjusting the p H value to be best, it is achieved that the rate of releasing H2O2 by the calcium peroxide is balanced with the utilization rate of H2O2, and it is avoided that the toohigh p H value influences later biological activity. The method has the advantages that the operation is simple, the application range is wide, and the oxidizing agent is safe, stable, effective andeconomic and cannot cause secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, belongs to the research aspects of environmental toxicology and ecological restoration, and particularly relates to the treatment of wastewater containing typical refractory emerging pollutants (the main pollutants studied in this paper include nonylphenol, triclocarban and estradiol). Background technique [0002] As a new class of refractory pollutants, pharmaceuticals and personal skin care products (PPCPs) are increasingly polluting the global environment, and even pose a serious threat to the global ecological environment and human life and health. Therefore, they are widely recognized by more and more environmental workers. focus on. PPSPs include a variety of substances. With the continuous improvement of production and living standards, their production and use are increasing. These substances are detected to varying degrees in water bodies, soils, sewage and sediments in...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/66C02F9/14
CPCC02F1/66C02F1/722C02F3/301C02F3/34C02F9/00C02F2001/007
Inventor 王亚利王冬波陈飞李小明曾光明
Owner HUNAN UNIV
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