| Sewage treatment is the most commonly used biochemical method, its treatment effect, project investment and operating costs and operating parameters by the external environment influence, especially those with unique climate and environmental characteristics of the western region. Biochemical Composite Process strengthen urban sewage treatment effect, the current research focus is wastewater treatment. Obtained by rotating biological test compound and the activated sludge process can be integrated with the Qinghai unique local climate and environment, and promote the transformation into practical productive forces, to solve local life, the actual situation of wastewater treatment problems of new technological achievements.Experimental Study of the advantages of the first process Isolation and purification methods Bacillus.app determine the biochemical conditions obtained Bacillus.app bacteria were gram-positive bacteria, to substrate carbon source glucose, sodium carboxymethyl cellulose, sucrose, maltose, xylose better use of nitrogen substrates beef extract, peptone, yeast extract has good decomposition, Bacillus.app bacteria do not produce acid substrate xylose as a carbon source when no gas, substrate carbon is Bacillus.app bacteria acid no gas when glucose and starch can be directly used.Conducted a small pilot test, the effects of pH, toxic substrates(phenols, trivalent chromium), nutrient solution dosage and temperature conditions for the survival and activity of bacteria. The results showed that: pH = 6.5, the dosage of nutrient solution at 0.02-0.04 mL / L, 16-30 ℃ ambient temperature conditions and low toxic matrix, the dominant bacteria have a higher biological activity.Small scale dynamic test on the process operating principle is analyzed, the domestication of activated sludge, sludge method using rotating biological biofilm, the system starts properly. Every single factor studied the effect of pH, biological rotary speed r, hydraulic retention time HRT, the mixture reflux ratio, sludge reflux ratio, SRT, temperature and dissolved oxygen conditions on the dephosphorization addition to the removal of nitrogen and organic matter. Tests showed that the optimal biological rotary speed set at 4 ~ 6 r / min, the COD can effectively remove more than 60%, and the use of micro-aeration to keep the sludge activity. pH range of 7 to 9, the general sewage can meet the requirements for the pH range is too large for industrial use, we recommend an additional adjustment pools so that water pH value is stabilized in the range of 7 to 8. HRT set to 8 h-12 h, the mixture reflux ratio set at 150%-200%, return sludge is 50%-100% of the preferred parameters, sludge age is set to 6 d-12 d, this for low-temperature process has a better adaptability, the temperature at 8 ~ 20 ℃, the ammonia nitrogen removal rate can be maintained at an average of 85.6%, total nitrogen removal rate 79.2%, COD and total phosphorus removal rate can reach 82.5% and 88.8, respectively %; in winter low temperature 6 ~ 8 ℃, ammonia nitrogen removal rate can be maintained at an average of 80.6%, total nitrogen removal rate 67.2%, COD and total phosphorus removal rate can reach 78.5% and 82.5%, respectively, for low temperature turntable removal of organic matter and nitrogen prominent effects, water quality can be improved by increasing the ratio of the mixture at reflux and other measures. When the influent DO <0.4 mg / L, the reactor anaerobic phosphorus release rate of more than 50%; when the influent DO> 0.4 mg / L, the phosphorus release significantly decreased, resulting in a great impact on the system, It is not conducive to strengthening the smooth biological phosphorus removal. Aerobic: DO control range is 3 ~ 4 mg / L, the operating parameters for the preferred parameters.The thesis also puts forward the improved biological rotating disc dephosphorization and activated sludge process measures and Suggestions for the effect of removing nitrogen. |
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