光合细菌(Z08)啤酒废水资源化研究

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.

Brewery wastewater treatment and resource recovery by photosynthetic bacteria Z08

This paper discusses the possibility and optimal conditions of brewery wastewater treatment using a new strain of photosynthetic bacteria (Z08). 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.