CJ/T 221-2023 in English
VALIDStandard test methods for urban sludge
- Issued on:2023-12-26
- Implemented on:2024-05-01
- File Format:PDF
- Delivery:RFQ
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| Standard No: | CJ/T 221-2023 |
| Document status: | VALID |
| Title in English: | Standard test methods for urban sludge |
| Title in Chinese: | 城镇污泥标准检验方法 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | RFQ |
| Issued on: | 2023-12-26 |
| Implemented on: | 2024-05-01 |
| ICS Classification: | 13.030.20-Liquid wastes. Sludge |
| Chinese Classification: | Z27-Analysis methods for industrial residue pollutants |
| Professional Classification: | CJ-Urban Construction |
| Related Keywords: | standard test methods
key detection methods determination items new inspection methods urban sludge introduction core content standard revision comparison dimensions cj/t |
Introduction
Core content of the standard revision
| Comparison dimensions | CJ/T 221-2005 | CJ/T 221-2023 |
|---|---|---|
| Number of detection indicators | 34 items | 66 items |
| New inspection methods | - | 51 kinds (including heavy metal forms, polycyclic aromatic hydrocarbons, etc.) |
| Number of revised methods | - | 54 kinds |
Key technological breakthroughs
Sample preparation innovation
The standard specifies for the first time the processing specifications for three types of samples:
- Mixed solution of biochemical system (need to be refrigerated at 4℃ and ≤24h)
- Volatile components (air drying is prohibited, and must be tested immediately)
- Stable metals (natural air drying is allowed)
Vacuum freeze-drying conditions: direct sublimation and dehydration at -40℃/10Pa to avoid component loss
Analysis of key detection methods
Determination of organic matter content (Section 5.1)
Use the triple constant weight method: evaporate to dryness in a water bath → bake to constant weight at 105℃ → burn in a muffle furnace at 550℃, calculation formula:
Organic matter content (ω1)=(m2-m3)/(m2-m1)×100%
Precision requirement: Parallel sample deviation ≤10%
Mixed liquor sludge concentration (Section 5.2)
Critical control points:
- Use 0.45μm filter membrane or quantitative medium-speed filter paper
- Wash with distilled water three times (10mL each time)
- Dry at 103-105℃ to constant weight (±0.001g)
Implementation suggestions
Quality control system requirements
| Parallel sample ratio | ≥10% (do 1 sample if there are less than 10 samples) |
| Moisture content determination deviation | ≤5% |
| Heavy metal detection | Morphological analysis is required (new requirement) |
Note: All testing equipment needs to undergo regular metrological certification
Sample only — not a preview of CJ/T 221-2023
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