primary settling 中文意思是什麼
primary settling
解釋
初級沉降-
15 raw sludge, no matter from primary or secondary settling, will not drain well on sand beds and will usually have an obnoxious odour
生的(未經處理的)泥漿,無論是來源於初次或者二次的沉澱,都不會很好的滲漏在沙床上而且會散發難聞的氣味。
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