Effect of different factors on the treatment of saponin manufacturing wastewater by photosynthetic bacteria.

【Objective】 Using gradually domesticated photosynthetic bacteria(PSB) to treat saponin manufacturing wastewater,the research studied the purifying effect and influence factors of saponin manufacturing wastewater by PSB,in order to establish a basis for the past-treatment of wastewater.【Method】 The experimental strain PSB A21 was domesticated first,and then the effects of cultivation condition,initial pH value of wastewater,disposal temperature,dosage of bacteria liquid and disposal time on the PSB purification were discussed.Furthermore,the optimum conditions of saponin wastewater treated by PSB were orthogonal optimized.【Result】 The influence degree of four factors on saponin manufacturing wastewater purifying effect by PSB was inoculating amounttemperaturedisposal timeinitial pH.The optimal operating conditions were:initial pH value 8.0,inoculating amount 250 mL/L,dark aerobic condition for 96 hours at 30 ℃,the wastewater COD removal rate 68.96%.【Conclusion】 Wastewater with a higher concentration can be efficiently treated by PSB,after the treatment,the saponin wastewater's COD was reduced.