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A Method for Predicting Exposure Levels of Organic Chemicals in Wastewater Aerobic Treatment Systems

An organic chemical, aerobic treatment technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of not considering aeration volatilization and other processes

Active Publication Date: 2016-08-24
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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Problems solved by technology

[0006] Byrns constructed a static prediction model for the fate of exogenous chemicals in STP. This model adopts the primary sedimentation-aeration process, does not include secondary sedimentation tanks, and the simulation of chemical fate is relatively simple, without considering aeration volatilization and other processes (ByrnsG.The fate of xenobiotic organic compounds in wastewater treatment plants.Water Research,2001,35(10):2523-33.)

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  • A Method for Predicting Exposure Levels of Organic Chemicals in Wastewater Aerobic Treatment Systems
  • A Method for Predicting Exposure Levels of Organic Chemicals in Wastewater Aerobic Treatment Systems
  • A Method for Predicting Exposure Levels of Organic Chemicals in Wastewater Aerobic Treatment Systems

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Embodiment 1

[0103] Select biphenyl as the chemical to be evaluated, and collect data on 8 basic physical and chemical properties of biphenyl, respectively molecular weight MW=154.21g.mol -1 , vapor pressure P=1261Pa, water-soluble S=7.5mg.L -1 , adsorption coefficient lgK oc =3.27, aerobic biodegradation rate k 5 = 1h -1 , daily discharge of chemicals ERC = 10kg.d -1 .

[0104] Collect or calculate the exposure scene data of the wastewater aerobic biochemical treatment system, see Table 1. The exposure scene parameters of the sewage treatment plant can be obtained by referring to the design parameters and relevant process technical specifications. The volume of each box can be calculated according to the hydraulic retention time, suspended solid concentration, suspended solid density, deposited sludge thickness, and total STP area. The exposure scenario parameters given in this example are a standard, default value.

[0105] Table 1 Exposure scenario data of wastewater aerobic bioch...

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Abstract

The invention discloses a method for predicting the exposure of chemicals in a wastewater aerobic treatment system (referred to as STP (O)). By adopting the wastewater aerobic biochemical treatment system as a basic process, according to symbiotic relationship among gas, water, suspended solids and sludge environmental media and the mass flow process of the chemicals, an STP (O) conceptual model is constructed and the prediction of the exposure level is completed by virtue of default environmental exposure scene parameters and only need of inputting the molecular weight, the vapor pressure (P), the water solubility (S), the aerobic biodegradation rate (k5), adsorption coefficient (Koc) and emissions (ERC) of the chemicals. The prediction method is simple, less in measured parameters and higher in prediction accuracy and is of important significance of exposure risk assessment of chemicals.

Description

technical field [0001] The invention relates to the field of chemical environmental risk assessment, and relates to an exposure prediction method for an organic chemical wastewater aerobic treatment system. Background technique [0002] my country is a big country in the research and development, production and use of chemicals. In addition to more than 45,000 existing chemical substances, thousands of new chemical substances are put into use every year. Sewage treatment plant (STP) is the key link for chemicals to enter the environment. Easily degradable chemicals can basically be completely removed in STP, but refractory chemicals are difficult to degrade after STP treatment, and some of them volatilize into the atmosphere and are Sludge adsorption and residual chemicals are discharged into the receiving water body with the secondary effluent, which has potential ecotoxic effects on the ecological environment, especially the aquatic ecosystem. [0003] At present, my coun...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 周林军刘济宁古文石利利丁洁林春骏
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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