GB/T 42367-2023 in English
VALIDChemicals—Protozoan activated sludge inhibition test
- Issued on:2023-03-17
- Implemented on:2023-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$272.00
《GB/T 42367-2023化学品 原生动物活性污泥抑制试验》由TC251（全国危险化学品管理标准化技术委员会）归口，TC251SC1（全国危险化学品管理标准化技术委员会化学品毒性检测分会）执行，主管部门为国家标准委。
Introduction
1. Standard Overview
GB/T 42367-2023 "Chemical Protozoa Activated Sludge Inhibition Test" is mainly applicable to the evaluation of the impact of chemical substances on biological treatment processes dominated by protozoa (especially ciliates) in sewage treatment plants.
2. Background of Standard Formulation
With the acceleration of industrialization and urbanization, water pollution problems are becoming increasingly serious. As a traditional wastewater treatment process, the activated sludge method faces the problem of chemical substance interference in practical applications. This standard is based on international comparative studies and adopts a multi-laboratory verification method to ensure the reliability and repeatability of the method.
3. Comparison of standard frameworks
| Standard dimensions | GB/T 42367—2023 | Comparison standards |
|---|---|---|
| Test objects | Protozoan activated sludge | Microbial community (such as GB/T 21801) |
| Evaluation indicators | $\mathrm{EC}_{x}$ value, used to quantify the inhibitory effect of chemicals | Biodegradation rate and hydrolysis product analysis (such as GB/T 21803) |
| Scope of application | Single chemical substance and mixture testing | Mainly for rapid biodegradability analysis (such as GB/T 21801) |
4. Implementation suggestions
Actual application case:A chemical company needs to evaluate the impact of its new surfactant on the sewage treatment system. By following the GB/T 42367-2023 standard and using the Protozoa activated sludge inhibition test method, it was found that the substance at high concentrations would cause a significant decrease in the $\mathrm{EC}_{50}$ value (about 0.8 mg/L), indicating that it has a strong interference effect on the sewage treatment system.
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