化糞池(chi)的清(qing)掏(tao)周(zhou)期與糞便污(wu)水(shui)(shui)溫度、氣(qi)溫、建筑物性質(zhi)及排(pai)水(shui)(shui)水(shui)(shui)質(zhi)、水(shui)(shui)量有關。設計清(qing)掏(tao)周(zhou)期過(guo)短，則化糞池(chi)糞液(ye)濃(nong)度過(guo)高，與實際清(qing)掏(tao)周(zhou)期差(cha)距過(guo)大，影響正常發(fa)酵和污(wu)水(shui)(shui)處理效果，甚(shen)至造成糞液(ye)漫溢，
影響(xiang)環境衛(wei)生(sheng)。設(she)計清(qing)(qing)(qing)掏(tao)周期(qi)(qi)(qi)過長，則化(hua)糞(fen)(fen)池容積過大，增加(jia)造(zao)價。《建(jian)筑給水(shui)(shui)(shui)排(pai)水(shui)(shui)(shui)設(she)計規范》(GBJ15-88)(以下(xia)簡稱《規范》)要求清(qing)(qing)(qing)掏(tao)周期(qi)(qi)(qi)為(wei)3～12個(ge)月(yue)(yue)，實(shi)際(ji)設(she)計中多取(qu)3～9個(ge)月(yue)(yue)，而酸性發(fa)酵階段的酸性發(fa)酵期(qi)(qi)(qi)為(wei)3個(ge)月(yue)(yue)，酸性減退期(qi)(qi)(qi)為(wei)5個(ge)月(yue)(yue)左右(you)。實(shi)踐(jian)證明：清(qing)(qing)(qing)掏(tao)周期(qi)(qi)(qi)的取(qu)定(ding)，應兼(jian)顧污(wu)(wu)水(shui)(shui)(shui)處理效(xiao)果、建(jian)設(she)造(zao)價、管理三個(ge)方面因素清(qing)(qing)(qing)掏(tao)周期(qi)(qi)(qi)一(yi)般不宜少于12個(ge)月(yue)(yue)。上(shang)元門水(shui)(shui)(shui)廠宿(su)舍(she)區(qu)平房(fang)群共用化(hua)糞(fen)(fen)池，使用人(ren)數200人(ren)，生(sheng)活(huo)污(wu)(wu)水(shui)(shui)(shui)標準每(mei)(mei)人(ren)30L/d，污(wu)(wu)泥(ni)量(liang)每(mei)(mei)人(ren)0.4L/d，進入化(hua)糞(fen)(fen)池新鮮污(wu)(wu)泥(ni)含水(shui)(shui)(shui)率取(qu)95%，發(fa)酵后污(wu)(wu)泥(ni)含水(shui)(shui)(shui)率取(qu)90%，設(she)計清(qing)(qing)(qing)掏(tao)周期(qi)(qi)(qi)選取(qu)12個(ge)月(yue)(yue)，經計算化(hua)糞(fen)(fen)池容積為(wei)21m3。
