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self-purification ['selfpju(ə)rɪfɪ'keɪʃ(ə)n]
environ.	autoépuration f
med.	autonettoyage m
nat.res.	auto-épuration f
self-purification A natural process of organic degradation that produces nutrients utilized by autotrophic organisms ['selfpju(ə)rɪfɪ'keɪʃ(ə)n]
environ.	autoépuration f

self-purification: 18 phrases in 3 subjects

Environment	14
Life sciences	2
Natural resourses and wildlife conservation	2