光合细菌(Z08)啤酒废水资源化研究

Brewery wastewater treatment and resource recovery by photosynthetic bacteria Z08

为了优化光合细菌处理啤酒废水的工艺条件以实现污水资源化,利用一株新的光合细菌(Z08)处理啤酒废水并回收菌体,探讨在光照厌氧、黑暗好氧、自然光微氧3种不同的环境条件对废水处理效果以及菌体增长的影响.结果表明:光照厌氧条件下COD去除率(88%)大于自然光微氧条件下COD去除率(74%),大于黑暗好氧条件下COD去除率(62%);光照厌氧条件下菌体总量增长率(38%)大于自然光微氧条件下菌体总量增长率(-35%),大于黑暗好氧条件下菌体总量增长率(-43%);光照厌氧条件所需水力停留时间(240h)大于自然光微氧条件所需水力停留时间(60h),大于黑暗好氧条件所需水力停留时间(36h).光合细菌可以实现啤酒废水的处理与资源化,推荐的工艺条件为:白天厌氧,夜晚好氧,光线不足时补充光源.在此条件下既可以快速降解污染物,又能获得较高的光合细菌增长量,此条件时废水中有机物转化为单细胞蛋白的转化率达到26%,有效地实现了污水资源化.

This paper discusses the possibility new strain of photosynthetic bacteria （Z08）. and optimal conditions of brewery wastewater treatment using a Light-anaerobic, natural light-microaerobic, and dark-aerobic operational conditions were explored to treat the wastewater and recover bacterial protein. The results show that the COD removal ratio under light-anaerobic condition （88%） is greater than that under natural light-microaerobic condition （74%）, ant it is also greater than that under dark-aerobic condition （62%） ; total bacterial growth ratio under light-anaerobic condition （38%） is greater than that under natural light-microaerobic condition （ -35% ）, and it is also greater than that under dark-aerobic condition （ -43% ） ; hydraulic retention time under light-anaerobic condition （240 h） is longer than that under natural light-microaerobic condition （60 h） and that under dark-aerobic condition （36 h）. It is feasible to use Z08 to treat beer wastewater and recover bacteria cell mass. The recommended conditions are as follows： anaerobic in daytime and aerobic at night, with additional artificial light when needed. Under such conditions, pollutants in the wastewater can be rapidly transformed into bacterial cell mass for utilization with a transformation efficiency of 26% for single cell protein.