| As the continuous investment of environmental protection is input more,and the continuous investment input big. the local sewage treatment plants have been built and put into operation. Although these new sewage treatment plant has a new line instruments, are the quite lack unified management system for the online instruments and effect evaluation system. On the treatment process, its operation functions, determine developing and trends, recovery confirmation and so on. The best judge is based directly on the activated sludge to determine the main function of microorganisms, which is the most effective and most reliable method to judge. However, there is Little research in this area in practice, as it involves subjects related to microbiology. There are some difficulties for environmental professionals in understanding, mastering and analysis.Based on the current in the stable operation of urban wastewater treatment cell body, in general, oxidation ditch, the three oxidation ditch, BAF, Cass several processes,dominated by setting the case of different microorganisms to study the case of various micro-organisms dominated the biological reactor treatment effect.Long-term daily use of analysis of data collected through the method of comparison, the four municipal wastewater treatment processes of the cell body of the protozoa and metazoan advantage of the cell body cell body analysis of advantages, including the oxidation ditch, the triple oxidation ditch, Cass process and BAF process. Study found that in terms of four kinds of process technology advantages and disadvantages of each process are relatively easy to stabilize at a certain protozoa and metazoan population balance between the range, resulting in each process is the removal of a substance rate is relatively high, the stability will be good, but will also effect on the treatment of other substances is not high. The oxidation ditch enhanced chemical oxygen demand and suspended solids removal, the triple oxidation ditch enhanced chemical oxygen demand,suspended solids and ammonia nitrogen, Cass process enhanced removal of suspended solids and total phosphorus, The BAF biological aeration tank of the biggest advantages is the small footprint.For treatment effect, the dominant animal in the epigenetic process under the cell body of the ammonia nitrogen removal can keep 95%. The protozoan dominant process under the cell body of the ammonia nitrogen removal can only be maintained at 80%. Distinguish between the original metazoan, mostly between 80-95% in the dominant protozoa, and 95% of the mostly dominant metazoan. Activated sludge dominant metazoan cell body can be maintained at 80% of the basic chemical oxygen demand removal efficiency over, but the dominant pool of protozoa can only maintain a 65% physical. So if 65-80% COD removal rates are mostly between the dominant protozoa, while 80% of the microscopic examination of the case must be distinguished. As for the pool of biofilm process COD removal from the body are maintained between 50-90%, which is difficult to distinguish the original metazoan. To distinguish between the removal rate of phosphorus from the original words of metazoan basically unlikely. Several techniques from the point of view are not difficult to see: Although the bacteria have on the total phosphorus removal, but the total phosphorus concentration in the effluent are relatively stable at 1.0mg / L or so, the higher the influent total phosphorus removal efficiency better. Suspended solids removal from the distinction between protozoa and metazoa are basically impossible. But seen from the data is clear: the activated sludge removal of suspended solids can be maintained at above 80%, while the biofilm process removal of suspended solids can only be maintained at between 40-80%. PH from protozoa and metazoa to distinguish between the words is basically impossible.Protozoa and metazoa like to live in the pH6.5-7.5 between the neutral environment. |
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