Oxidation ditch

https://www.wikidata.org/wiki/Q815353

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Biology 34.8M papers	Chemistry 28.4M papers	Engineering 23.9M papers	Organic chemistry 12.8M papers
Ecology 7.8M papers	Environmental science 7.7M papers	Waste management 1.5M papers	Environmental engineering 949k papers
Wastewater 240k papers		Sewage treatment 116k papers
Current
Oxidation ditch 718 papers
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