Influence of dispersed and anaerobic bacteria in aerobic paper-making wastewater treatment

摘要

In order to be helpful to control dispersed microorganisms for stabilization of waste-water treatment in a paper-making process, dominant strains were isolated aerobically and anaerobically, and identified and physiological characteristics were also analyzed. Pseudomonas carboxydohydrogena, Cardiobacterim hominis, Micrococcus lylae, Xantomonas campestris pv juglandis, Micrococcus diversus, and Comamonas terrigena as aerobic dominants, and Streptococcus bovis and Prevotella buccae as anaerobic dominants were identified from the supernatent of the primary settling tank. It seemed that microflora in the treatment process would consist of many kinds of microorganisms, whose dominant would change easily according to environmental conditions. They all grew well at 37 deg C and at different initial medium pH's. Especially, some of them required sulfate ion for their growth, which came from a chemical coagulant of aluminium sulfate in the primary settling tank. Interestingly, many anaerobes grew well even in the aerobic wastewater treatment process and seemed to have some functions. Population of anaerobes increased three times in the supernatant of primary settling tank and ten times in the bottom sludge of primary settling tank than in the prime wastewater. Therefore, these anaerobes contributed to the production of offensive gases, which would make some microorganisms not precipitate and be buoyant.