GB/T 21796-2022 in English
VALIDChemicals—Activated sludge respiration inhibition test
- Issued on:2022-07-11
- Implemented on:2023-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
《GB/T 21796-2022化学品 活性污泥呼吸抑制试验》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化管理委员会。
Introduction
Analysis of the key points of the standard revision
| Technical elements | 2008 edition | 2022 edition | Significance of improvement |
|---|---|---|---|
| Applicable objects | Urban sewage treatment system | Extended to industrial sewage system | Improve applicability of industrial wastewater treatment |
| Test device | No specific container is specified | Standardized BOD bottle electrode assembly | Ensure the reproducibility of test results |
Interpretation of core technology innovation
Improvement of AIUTO principle: 98% nitrification inhibition efficiency was achieved by optimizing the ATU inhibitor concentration gradient (increased to 11.6mg/L)
Preventing false positive verification: Adding a new non-biological control group verification measure to avoid the error caused by the redox reaction of the chemical itself
Test data management specifications
- EC50 calculation follows Weibull probability model verification
- The coefficient of variation is forced to be controlled within the 30% threshold
- The test record must include a respiratory rate curve graph (C.1)
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