The Research On The Characteristics Of A₁ And Its Effect On Wastewater Treatment

Bioaugmentation directly adds predominant bacteria screened from natural world or high-efficiency bacteria created by means of genetic combination technology to the system, removes some particular harmful material or optimizes the capacity, and finally improve the treatment ability. It is a good application and development of modern microbiological culture technology in the field of wastewater treatment.In this paper bacterium was selected from ginseng soil(temporarily named as A1 and preserved by Environmental Engineering Institute of Northeastern University). It took simulated starch wastewater, simulated wastewater cellulose, simulated MSG wastewater and real campus wastewater as research objects, and study the affect it does on these kinds of wastewater.The physiological and biochemical experiments showed that the most suitable temperature for A1 is from 25℃to 30℃. It is capable of decomposition of glucose acid, the metabolism of glucose, starch, cellulose and citric acid.When A1 was added into analog starch wastewater, simulated cellulose wastewater, or simulated MSG wastewater, it is realized that A1 have good degradability. After the study on the effect on the simulated starch wastewater by facters as the thalli culturing time, culturing temperature, moving speed of shaking table, etc. The result shows that when the temperature is 30℃, the shaking table moves at a rate of 160r/min, and the pH equals 6.6～7.0, the CODcr removal rate of the simulated starch wastewater without sterilization can be as high as 97.5% after 120 hours. By means of the filter weight loss rate and determination on CMC enzyme activity, we know that the peak appears from the fourth day to the sixth day. The filter weight loss rate is 16% on the sixth day. The CODcr removal rate of simulated cellulose wastewater is 78.3% after 24 hours. Based on the study on the simulated MSG wastewater, it shows that if the Ph>7 at the beginning, the CODcr removal rate is 92.6% after 96 hours. Adding A1 into the activated sludge for the simulated starch wastewater and real campus sewage treatment process, we found that the CODcr removal rate on the simulated starch wastewater can be more than 90 percent after 4h, and CODcr removal rate is 95.0% after 24h; in terms of campus sewage disposal, the CODcr density reduces from 1438.5mg/L to 79.9mg/L after 5h, and the CODcr removal rate is 95.1 percent, which then can accomplish the second emission standards of Urban Sewage Discharge Standards, and is better than the activated sludge treatment without A1.