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Standards Development
The standard is applicable to the toxicological evaluation and classification of chemical pollutants in sludge/biosolids for land application including aerobic compost sludge, anaerobic digestion sludge, sludge-based biochar, etc
In particular, in this document:
(1) The food chain agricultural application mainly refers to the use of sludge in crop farms that enter the human food chain, such as grain, corn, and vegetables.
(2) The non-food chain agricultural application mainly refers to the use of sludge in any land/soil from which the plants grown up without entering the human food chain, such as energy crops and fibre crops.
(3) Landscape application includes human-accessible and human-inaccessible area.
(4) Sandy soil and exposed mine remediation application include remediation of sandy soil and remediation of mines.
(5) The procedure of sludge classification will be provided.
The purpose of this proposal is to standardize toxicological evaluation and classification of chemical pollutants in sludge/biosolids in land application, promote the compatibility and unification of evaluation standards for different treatment processes in different countries.
With the industrialization and urbanization process, the daily output of municipal sludge, the types and contents of chemical pollutants in sludge are getting increase and complicated, and the toxicity of sludge is becoming more difficult to predict. Appropriate treatment of sludge has become an unavoidable challenge. Beneficial use of sludge after stabilization can not only reduce sludge pollution, but also recycle the resources in sludge, which is the trend of future development. While sludge products was for land application, the toxicity of chemical pollutants in the products need to be appropriately analysed and classified to ensure their safe use. However, there are significant technical gaps in their toxicological evaluation thus leading to an inability to compare the values of indicators across countries in a cross-sectional manner.
The above facts can justified the feasibility of this proposal. Here, it worth to notice that the later an international standard is issued, the more difficult it will be to be compatible with the existing standards developed by various countries. Considering that no other international organization is engaged in the research and development of the proposed standard, the work needs to be carried out immediately.
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