一株光合细菌的鉴定及其处理大豆加工废水试验

The identification of a strain of photosynthetic bacteria and its effect in treating soybean wastewater [

摘要:

为进一步明晰从土壤中提取的一株光合细菌的生理生化特性,并实现利用其处理污水、达到资源化的目标,对此株光合细菌进行了菌种、形态以及生理生化鉴定,并考察了其在不同条件下降解人工配制的大豆加工废水的效果．结果表明,此株菌为球形红假单胞菌(Rhodopseudomonas sphaeroides,命名为Z08)．在初始COD质量浓度为8 000～12 000 mg·L^-1、温度为26～28 ℃条件下,菌种最佳投量为160～400 mg·L^-1,经过72 h的处理,COD去除率达85％以上．比较多种光照氧气条件发现在自然光微氧的条件下,经过72 h处理,Z08对大豆废水COD的去除率达73.5％,菌体产量达2 125 mg·L^-1．由此确定了Z08处理大豆加工废水的最佳处理条件为自然光微氧,投菌量为160～400 mg·L^-1,处理时间为72 h．

Abstract:

This paper studied the physiological and biochemical characteristics of a new strain of photosynthetic bacteria isolated from soil in details, identified its belonging, and used it to treat artificial soybean wastewater and reclaim resources. Results showed that the strain belonged to Rhodopseudomonas sphaeroides, and was named Z08. For treating wastewater with COD of 8 000-12 000 mg·L^-1 under 26-28 ℃, the optimal dose of PSB was 160-400 mg·L^-1; COD removal reached 85％ after 72 h. Various oxygen-light conditions were examined, and the best one was found to be natural light-micro oxygen condition. Under this condition, COD removal reached 73.5％ and biomass reached 2 125 mg·L^-1 after 72 h treatment. The optimal condition of Z08 treating soybean wastewater was as follows: natural light and micro oxygen condition, Z08 dose of 160-400 mg·L^-1, and hydraulic retention time of 72 h.