Sustainable urban sanitation presents one of the most significant service delivery challenges related to poverty alleviation and sustainable development in the decades to come. To illustrate what putting sustainable sanitation into practice realistically means is crucial. In the developed world, the challenge is to initiate a transition from disposal oriented, water-based infrastructure regimes towards more sustainable, reuse oriented, and productive sanitation regimes. Decentralised approaches to "productive sanitation" (including e.g. the production of biogas, fertilizer, water for irrigation, etc.) with a source-separation focus (separation of flow streams with different properties) allow for considerable cost and resource savings and are thereby increasing sustainable. In the developing world, the sanitation challenge is about leapfrogging dead-end approaches and technologies as an opportunity, especially for those areas which are currently without sanitation services, and to overcome the huge service backlog. This paper gives an initial overview of the current state of urban sanitation with a North-South perspective, followed by a discussion of the new role of sustainable sanitation systems in future eco-cities. Planning innovations for urban sanitation, initial lessons learned and current challenges faced are addressed. Context specific challenges and opportunities are illustrated in a variety of urban settings, from non-tenured low-income settlements (slums) to middle-and high-income inner-city areas, to stimulate action on the ground.
A treatment plant using conventional biological treatment combined with hydroponics and microalgae is constructed in a greenhouse in the area of Stockholm, Sweden. The treatment plant is built for research purposes and presently treats 0.559 m3 of domestic wastewater from the surrounding area per day. The system uses anoxic pre-denitrification followed by aerobic tanks for nitrification and plant growth. A microalgal step further reduces phosphorus, and a final sand filter polishes the water. During a three week period in July 2002 the treatment capacity of this system was evaluated with respect to removal of organic matter, phosphorus and nitrogen. 90% COD removal was obtained early in the system. Nitrification and denitrification was well established with total nitrogen reduction of 72%. Phosphorus was removed by 47% in the process. However, higher phosphorus removal values are expected as the microalgal step will be further developed. The results show that acceptable treatment can be achieved using this kind of system. Further optimisation of the system will lead to clean water as well as valuable plants to be harvested from the nutrient rich wastewater.
Aims: To measure the microbial removal capacity of a small-scale hydroponics wastewater treatment plant. Methods and Results: Paired samples were taken from untreated, partly-treated and treated wastewater and analysed for faecal microbial indicators, i.e. coliforms, Escherichia coli, enterococci, Clostridium perfringens spores and somatic coliphages, by culture based methods. Escherichia coli was never detected in effluent water after >5AE8-log removal. Enterococci, coliforms, spores and coliphages were removed by 4AE5, 4AE1, 2AE3 and 2AE5 log respectively. Most of the removal (60-87%) took place in the latter part of the system because of settling, normal inactivation (retention time 12AE7 d) and sand filtration. Time-dependent log-linear removal was shown for sporesConclusions: Hydroponics wastewater treatment removed micro-organisms satisfactorily.Significance and Impact of the Study: Investigations on the microbial removal capacity of hydroponics have only been performed for bacterial indicators. In this study it has been shown that virus and (oo)cyst process indicators were removed and that hydroponics can be an alternative to conventional wastewater treatment.
In Indonesia 66 million people practice open defecation, which is the second highest number of people in one single country following India. Indonesia lacks sanitation services, in particular in rural areas. Data from the national statistics bureau show that almost 33% of the population in rural areas have no sanitation facilities. This study looked at alternative sanitation options in a community in East Java. Its aim was to evaluate the feasibility of different sanitation options, to conduct an integrated assessment of those options, and to identify the community perceptions of those options. The investigated technologies encompassed on the one side locally widely spread and accepted technologies (such as septic tanks), and on the other, new but promising concepts which have not yet been well established in Indonesia (such as biogas plants or ecosan systems). The study has shown that despite the high costs (NPV), the high hygienic risk potential and low environmental performance, septic tanks were most preferred by the community. Generally, those options which performed best in the assessment (community and decentralized sanitation systems) were least preferred by the community.
There are billions of people around the world that lack access to safe water supply and basic sanitation, a situation which puts the affected in severe health conditions as well as economical and social despair. Many of those lacking adequate water supply and sanitation systems can be found at the fringe of the cities in so called peri-urban areas, especially in the developing world. Planning in these areas is highly complex due to challenging environmental and physical conditions, high population density and unclear institutional boundaries. This article presents a framework aiming to support the planning process for sustainable water and sanitation systems in peri-urban areas. The suggested framework is based on different available planning approaches from a review of literature and websites of organisations and companies. It consists of a recommendation of important steps in the planning process as well as supporting tools. Further, it incorporates a set of sustainability criteria important for the peri-urban context and allows for the development of site specific systems. The framework has the aim to be flexible for different planning situations, and for suiting planners with different perspectives and amount of resources.
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