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A method for predicting exposure concentration of organic chemicals after sludge agricultural use

A technology of organic chemicals and prediction methods, applied in the direction of chemical process analysis/design, etc., can solve problems such as multiple input parameters of the model, unsuitable exposure prediction at the screening level, complexity, etc., to achieve clear algorithms, scientific mechanisms, and improved accuracy Effect

Active Publication Date: 2021-11-16
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the calculation process, the model calculates the concentrations of chemicals in soil, pore water, and biomass separately, and additionally considers runoff, erosion, plant uptake, soil vertical concentration differences, and the distribution of biomass and pore water. There are many input parameters and are relatively complex, so it is not suitable for exposure prediction at the screening level

Method used

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  • A method for predicting exposure concentration of organic chemicals after sludge agricultural use
  • A method for predicting exposure concentration of organic chemicals after sludge agricultural use
  • A method for predicting exposure concentration of organic chemicals after sludge agricultural use

Examples

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Embodiment 1

[0071] Select bisphenol A as the chemical to be evaluated, and collect the basic physical and chemical property data of bisphenol A, respectively molecular weight MW=228.29g·mol -1 , test vapor pressure Vp tmeptest =2.97×10 -5 Pa (test temperature 298K), water solubility Sol TempTest =300mg·L -1 (test temperature 298K), adsorption coefficient lgK oc =2.88, soil biodegradation rate k bio_soil =2.31×10 -4 d -1 . According to "Anqi Yang. Research progress on the removal of new pollutants in sludge anaerobic digestion. Environmental Pollution Control, 2016,38(3):82-89", the concentration of bisphenol A in sludge C sludge = 1.75 mg·kg -1 . The calculation result of this prediction method is that the initial concentration of bisphenol A in the soil after the agricultural use of the sludge is 0.0077 mg·kg -1 , the concentration was 0.0071mg·kg in 30 days -1 , the 30-day average concentration is 0.0074mg·kg -1 . The concentration curve with time is shown in figure 2 . ...

Embodiment 2

[0149] Select nonylphenol as the chemical to be evaluated, and collect the basic physical and chemical property data of nonylphenol, respectively molecular weight MW=220.3g·mol -1 , vapor pressure Vp=0.109Pa, water-soluble Sol=7mg·L -1 , adsorption coefficient lgK oc = 4.5, soil biodegradation rate k bio_soil =2.31×10 -4 d -1. Concentration of nonylphenol in sludge C sludge =10.59 mg·kg -1 . After running the model calculation, the initial concentration of nonylphenol in the soil after sludge agricultural application was 0.0467mg·kg -1 , the concentration is 0 mg·kg at 30 days -1 , the 30-day average concentration is 0.017mg·kg -1 . The concentration curve with time is shown in image 3 .

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Abstract

The invention discloses a method for predicting the exposure concentration of organic chemicals after sludge agricultural use. In this method, the soil is regarded as a single uniformly mixed interval, the input of chemicals is agricultural sludge, and the removal is volatilization, biodegradation and leaching, and follows pseudo-first-order kinetics. This method considers the effect of the biodegradation of rapidly biodegradable and slowly degrading organic carbon in sludge on the soil-water partition coefficient. This prediction method has fewer chemical input parameters (6), is practical, simple, fast, practical, and has high prediction accuracy, and can be used to predict the environmental exposure concentration of chemicals at the screening level.

Description

technical field [0001] The invention relates to the field of chemical environmental risk assessment, and relates to a method for predicting the exposure concentration of organic chemicals after sludge is used for agriculture. Background technique [0002] According to the "Guidelines for Best Available Technologies for Pollution Prevention and Control of Sludge Treatment and Disposal in Urban Sewage Treatment Plants (Trial)" issued by the Ministry of Environmental Protection in 2010, and the "Technical Guidelines for Sludge Treatment and Disposal in Urban Sewage Treatment Plants" issued by the National Development and Reform Commission and the Ministry of Construction in 2011 ( Trial implementation), urban sludge land use is a major, best and feasible sludge disposal method in my country. However, in the process of sludge land use, urban sludge contains a relatively high content of organic pollutants into the soil, which may cause environmental pollution risks. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C20/10
CPCG16C20/10
Inventor 范德玲周林军刘济宁古文郭敏杨兴凤王蕾顾杰吉贵祥石利利梁梦园汪贞
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA