Brewery wastewater treatment and resource recovery by photosynthetic bacteria Z08

Abstract:

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.