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- sewage (27)
- purification (24)
- refuse and refuse disposal (17)
- recycling (waste, etc.) (12)
- 煤矿 (9)
- biological treatment (8)
- environmental aspects (8)
- 矿山安全 (5)
- pollution (4)
- recycling (4)
- sewage sludge (4)
- waste minimization (4)
- 教材 (4)
- 矿井水 (4)
- congresses (3)
- handbooks, manuals, etc (3)
- sewage disposal plants (3)
- water (3)
- 研究 (3)
- addresses, essays, lectures (2)
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