Exposure level prediction method of organic chemical of anaerobic-aerobic treatment system of wastewater

An organic chemical, aerobic treatment technology, applied in aerobic and anaerobic process treatment, electrical digital data processing, special data processing applications, etc., can solve problems such as unseen chemicals

Active Publication Date: 2015-05-13
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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Problems solved by technology

In general, there are no domestic and foreign models simulating the fate ...

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  • Exposure level prediction method of organic chemical of anaerobic-aerobic treatment system of wastewater
  • Exposure level prediction method of organic chemical of anaerobic-aerobic treatment system of wastewater
  • Exposure level prediction method of organic chemical of anaerobic-aerobic treatment system of wastewater

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Embodiment 1

[0113] 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 V=1261Pa, water-soluble S=7.5mg / L, adsorption coefficient lgK oc =3.27, anaerobic biodegradation rate k 10 =0.3h -1 , aerobic biodegradation rate k 5 = 1h -1 , daily discharge of chemicals ERC = 10kg.d -1 .

[0114] Collect or calculate the exposure scenario data of the wastewater anaerobic-aerobic biochemical treatment system, see Table 2. 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.

[0115] Ta...

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Abstract

The invention discloses an exposure level prediction method of organic chemicals of an anaerobic-aerobic treatment system of wastewater (STP(A/O) for short). The method comprises the following steps: by taking A/O biological treatment system of wastewater as a basic process, constructing a STP(A/O) concept model according to a coexisting relationship of gas, water, suspended particles and a sludge environment-friendly medium and a mass flow process of the chemicals; and by defaulting an environmental exposure scene parameter, just inputting the molecular weights of the chemicals, a vapor pressure (P), water solubility (S), anaerobic biodegradation rate (k10), aerobic biodegradation rate (k5), adsorption coefficient (Koc) and discharge (ERC) to predict the exposure level. The prediction method is simple and feasible, fewer in measured parameters and relatively high in predicting accuracy, and has important meaning for evaluating exposure risk of the chemical.

Description

technical field [0001] The invention relates to the field of chemical environmental risk assessment, and relates to an exposure prediction method for an anaerobic-aerobic treatment system of organic chemical wastewater. 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 pre...

Claims

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Application Information

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IPC IPC(8): C02F3/30G06F17/50
CPCY02A20/152
Inventor 刘济宁周林军冯洁林春骏石利利范德玲
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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