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épuration des eaux d'égout
transp., environ.	sewage treatment; wastewater purification; wastewater treatment; sewage purification
waste.man.	sewage sludge gas; sewage processing
épuration des eaux d'égouts
construct.	sewage treatment

épuration des eaux d'égout: 8 phrases in 3 subjects

Construction	5
Fish farming pisciculture	1
Waste management	2