Rotating biological contactor

https://www.wikidata.org/wiki/Q2396721

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Engineering 23.9M papers	Environmental science 7.7M papers	Waste management 1.5M papers	Environmental engineering 949k papers
Wastewater 240k papers	Sewage treatment 116k papers	Effluent 105k papers
Current
Rotating biological contactor 1,075 papers
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