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Lijiang Old Town District wastewater treatment plant, the second phase using ICEAS craft. However, with the improvement of people's living standards, the number of tourists is increasing, especially in Lijiang County, approved by the UNESCO as a natural and cultural double inheritance, the growing popularity of high number of tourists has increased year by year, the degree of water pollution will increasingly intensify handling capacity has been far less than the actual volume of sewage discharge. Increased interception pipeline, expansion of the sewage treatment plant is imperative. For ICEAS process in dealing with low concentrations of urban sewage phosphorus removal rate is not high, less sludge and sludge aging and other issues, in order to treatment effect the ICEAS process, especially nitrogen and phosphorus removal rate improved Lijiang Old Town District wastewater treatment plant expansion project designed using improved ICEAS process. In addition, with the social development of the requirements for disinfection of wastewater discharged from the plant in the expansion problem also take into account the problem. Improved ICEAS process focused on the problems of ICEAS process improvements made on its basis. Improved ICEAS process is a process A2 / O process and ICEAS of technology combined phosphorus removal function improve ICEAS process by setting the anaerobic zone (select area), and sludge return and inhibit sludge bulking effect. The debugging run during debugging power supply and distribution, PLC automatic control system commissioning and trial run of the system include the analysis of the treatment effect in the low influent concentration process run mode research, better operating parameters orthogonal experiment, sludge age and in addition the phosphorus effect improved ICEAS and original ICEAS Process effect comparative analysis of a series of experimental studies. Finally the project's economic, social analysis. Running the low concentrations improved ICEAS process debugging. The influent concentrations are lower than the design influent, effluent CODcr concentration between 20 ~ 44.3mg / L, the removal rate of 67.1 to 83.3%, the effluent BOD5 between 8.5 ~ 19.1mg / L, the removal rate of 53.6 ~ 72%; effluent NH3-N between 0.3 ~ 2.5 mg / L, the removal rate of 84.1 to 97.1%; effluent TP between 0.8 ~ 1.5 mg / L, the removal rate of 16.7 to 69.2%; effluent SS in 10 ~ 21 mg / L, the removal rate of 84.2 to 91.3%. Overall, the treatment effects are good, the indicators are to meet the emission standards. Select DO, sludge loading and sludge reflux ratio test of three factors. According to the actual operation, DO, sludge loading and sludge return more than three levels were selected orthogonal experiment, TP is the limiting factor for the wastewater treatment plant operation control, the removal rate of TP is regarded as the most important assessment The indicators analyzed at low concentrations the preferred operating parameters of the process: DO was 3mg / L, the sludge load 0.2kgBOD5 / (kgMLSS * D), the sludge recycle ratio is 25%. When the sludge age design sludge age 17d, the sludge concentration maintained at about 3000mg / L under the conditions, can better ensure the treatment effect CODcr, BOD5, ammonia and other pollutants, phosphorus removal effect has also been improved, The effluent TP decreased to 0.63mg / L fully meet \The improved the ICEAS craft and original ICEAS of process to remove the effect of contrast analysis. Improved ICEAS process improve both the effect of the removal of various pollutants, especially phosphorus removal has greatly improved. At low concentrations improved ICEAS process compared with the original process, TP, BOD5, CODcr, NH3-N, the average removal rate than ICEAS process were increased by 22%, 7.8%, 8.3% and 2.7%. In addition, the improved ICEAS pool the the sludge activity than ICEAS pool better. The construction and operation of the demonstration projects to protect and improve the environment of the water environment of the World Cultural Heritage Lijiang Old Town and Urban Habitat, to promote tourism and socio-economic development, the project has a large social benefits to the region the sustainable development of the economy has also played an important supporting role.
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