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| 21. | breaking down [waste water] |
| 分解〔污水〕 |
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| 22. | effluent from a dye house |
| 染房污水 |
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| 23. | effluent sewage |
| 废污水 |
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| 24. | sewage effluent |
| 污水排水口 |
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| 25. | activated sewage |
| 活性污水 |
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| 26. | preliminary treatment(of sewage) |
| 预处理（污水） |
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| 27. | fish-farming with sewage |
| 污水养殖 |
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| 28. | sewage analysis |
| 污水分析 |
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| 29. | ore industry sewage |
| 采矿工业污水 |
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| 30. | sewage utilization |
| 污水利用 |
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