Upgrading Reconstruction Technology Research Of The Sewage Disposal Plant Of Shijiazhuang Economical And Technique Develop Area

The effluent designed of the sewage disposal plant of Shijiazhuang economical and technique develop area was secondary standard, according to relevant regulations, the facility must be expanded and upgraded. There are more than 90% of the industrial wastewater in the influents of the plant, which is hard to meet the effluent standard of A in First grade through the traditional wastewater treatment processes. In this paper, a pilot-scale experiment was conducted to determine the optimum technical strategies based on the actual characteristics of the influent, and then made the upgrading reconstruction plan and evaluated the feasibility at technical and economic aspects, aiming at offering a guidance to the upgrading of the operating water plant.1) A pilot-scale experiment was carried with the process of " HAF+BFP+FSBBR+MBBR+O3/BAC ", the treatment potential was 1.0 m3/h, and the hydraulic retention time were 3.6h,7.8h,5h,7.8h,7.8h and 1.5h, respectively. The research indicated that:when the quality of influents was COD 300-800mg/L, NH3-N 30-60mg/L, TN 50-80mg/L and TP 5-7mg/L, the removal efficiency of COD, NH3-N, TN and TP were more than 85%,90%,73% and 93%, respectively. Each index of effluent reached the primary standard level A of discharge standard of pollutants for municipal wastewater treatment plant (GB18918-2002), and then operating parameters of each unit were optimized.2) The upgrading reconstruction plan were drafted combining the main structures and plane arrangement of the sewage treatment plant and the design process of sewage treatment plan which was made on the basis of pilot-scale experiment.3) The economic and technical feasibility study of the upgrading reconstruction plan indicated that the process is efficient, stable and reliable. The total investment of reconstruction project was 4965.43×104 yuan, the annual operating cost of the whole plant was 1234.52×104yuan, and the running cost was only 0.748 yuan/t. This project was estimated to reduce the emissions of COD, NH3-N, TN, TP about 8213t/a,730t/a,456t/a, 63.88t/a, respectively and the social benefits and environmental benefits of the project were incalculable.