饲料植物处理猪场厌氧废液的pH值变化规律

Changes in pH Values of Anaerobic Digested Piggery Effluent In Feeding Plant Treatment

研究了基于3种饲料植物空心菜、水稻和水葫芦处理体系中猪场厌氧废液的pH值变化规律以及其与其它水质指标之间的关系.结果表明:随着植物生长,各处理体系中废水pH值总体呈下降趋势,在处理第15天时,空心菜和水稻处理体系中废水pH值从起初8.22降至约为7,水葫芦处理体系中pH值则降为5;随着处理时间增加,pH值变化量增大,COD、NH4+-N、TN、TP去除率也在提高.

Changes in pH values and the relationship between pH values and relevant water quality indexes were studied in the process of anaerobic digested piggery effluent treatment using three selected feed plants： Ipomoea aquatica, Oryza sativa and Eichhornia crassipes. A general trend of decline in the effluent pH values was observed with the increase of plant growth and on the 15^th day after the treatment the pH value dropped from 8. 22 to approximately 7 in Ipomoea aquatica and Oryza sativa pots and 5 in Eichhornia crassipes pots. The removal rate of COD,NH4^＋-N,TN and TP increased with the lengthening of time after treatment, associated with pH value changes.