CONSTRUCTION OF A NEW WATER METABOLIC SYSTEM BASED ON APPROPRIATE SEPARATION OF WATER COLLECTING AND DISCHARGE AREA

本研究的目的是通过水资源的优化利用和一次性水的再利用，提出城市水代谢系统的设计和建设，以适当的质量和数量支持各种水的消耗。因此，完成了以下课题的研究。(1)污水深度处理系统的开发；提出了厌氧流化床生物反应器系统作为一种先进的污水处理系统。该体系能有效地分离含氮、磷化合物。此外，通过引入第2个反硝化池，并对絮凝污泥进行投料处理，最终出水总氮和总磷浓度分别为0.5 ~ 1.0mg/l和0.01 ~ 0.05mg/l。因此，富营养化可能会大大降低。(2)自然净化系统，配合先进的废水处理系统；将混凝等高级污水处理工艺应用于污水处理厂出水后，藻类生长势（AGP）由120 ~ 200mugchla /l降至50mug CHLa/l以下。此外，当混凝出水在水库中保存40 d时，与AGP值相比，藻类生物量极低（20-5.50mugCHLa/l）。结果表明，富营养化电位的降低提高了水体的自然净化能力。(3)土壤入渗改善水质；当储水池出水进入土壤时，SS、TOC和总氮均能被物理和生物去除，特别是硝化和反硝化过程对含氮物质的去除达到90%以上。因此，自然净化系统与先进的废水处理工艺相结合，使曾经使用过的水得以再利用。此外，土壤入渗过程对水质也有改善作用。少

The objective of this study wa to propose the design and construction of urban water metabolic system which supports various water consumption with appropriate quality and quantity by an optimal use of water resource with reuse of once used water. Therefore, the following subjects of research was accomplished.(1) Development of advanced wastewater treatment system ; The authors had proposed an anaerobic fluidized pellet bed bioreactor system as an advanced sewage wastewater treatment system. This system could be effectively nitrogenous and phosphorus compounds. In addition, by the introduction of 2nd denitrification tank and with feeding to flocculated sewage sludge, the concentration of total nitrogen and total phosphorus in the final effluent was between 0.5 and 1.0mg/l, and between 0.01 and 0.05mg/l respectively. Consequently, eutrophication potential could be greatly decreased.(2) Natural purification system in cooperation with an advanced wastewater treatment system ; When the adv … More anced wastewater treatment process such as coagulation process was applied to the effluent from sewage treatment works, the algal growth potential (AGP) was decreased to less than 50mug CHLa/l from 120-200mugCHLa/l. Moreover, when the effluent from the coagulation process was stored in the reservoir at 40 day of retention time, the amount of algal biomass was extremely low (20-5.50mugCHLa/l) comparing the value of AGP.This result indicated that the decrease of eutrophication potential enhanced the natural purification capacity.(3) Improvement of water quality by soil infiltration ; When the effluent from the storing reservoir was infiltrate into the soil, SS,TOC and total nitrogen could be removed physically and biologically, especially nitrogenous substances was removed above 90% by nitrification and denitrification process.Consequently, the natural purification system combined with the advanced wastewater treatment process enabled the reuse of once used water. Moreover, the soil infiltration process enhanced the water quality. Less