Abstract
Microbes which have the ability to influence the brightness of color (stimulation value) in the final effluent of activated sludge system for swine wastewater were identified. Significant positive relationships were obtained between the number of eumycota, actinomycetes, iron-reducing microbes in aeration tank of the system and the stimulation value in the effluent. Streptococcus, actinomycetes and eumycota with each selected medium lowered the pigment in the effluent. In contrast, anaerobes and Lactobacillus increased the stimulation value in the same treatment. Actinomycetes in soil decreased the stimulation value in the effluent. The microbes that were grown in BTB lactose medium and ammonia-assimilating bacteria in soil also decreased the pigment in the effluent whereas anaerobes and eumycota with each selected medium raised the stimulation value.
