"NDCITYLINE (IAKS)"-System

"NDcitylineiaks"-system is a complex wastewater treatment concept developed for Nam Dihn City. In this concept, sewage treatment is decentralized organized and the sludge treatment in a centralized manner, where the sludge from wastewater treatment (WWT) sites ist transported via sludge pipelines to the sludge treatment location. Following the demands of sustainability "NDcitylineiaks"-system is based on results of material flow analysis (MFA). The MFA considers the theory of hierarchy of natural resources for the development of a suitable recycling concept, where sewage and sludge discussed as available natural resources. On this way, WWT-process and sludge treatment process offer a large series of so-called by-products (reusing of treated water for industrial purposes, methane gas, low and high temperature heat, cool, electricity, CO2-conversion into biomass, activated carbon, heavy oil, coal, fertilizer). The approach of trickling filter technology for the WWT-process reduces remarkable the costs for the construction, the operating costs and the area consumption in comparison to common used activated sludge technology. A linked municipal sewage and solid waste management and a specialized facility management increase the volume and efficiency of by-products. The mentioned orientation of management components supports new settlement of companies in direct neighborhood of treatment plants. In result of a successful strategy of industry settlement, the approaches of by-products create chances to refinance the investment and the operating costs in a certain time connected with lower costs for settled enterprises. The "NDcitylineiaks"-system considers ecological aspects by reusing natural resources and a full recycling concept. It supports directly the future economic development of local industry and offers chances to link industrial and agricultural development in the region (e.g. via food processing industry). Finally, the lower costs and the presented option for refinancing offer better chances to construct WWT-plants without increase of any further fees for the population following the demand for safety of supply in the sense of sustainability.