582,640 research outputs found

    Simultaneous treatment of SO2 containing stack gases and waste water

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    A process for simultaneously removing sulfur dioxide from stack gases and the like and purifying waste water such as derived from domestic sewage is described. A portion of the gas stream and a portion of the waste water, the latter containing dissolved iron and having an acidic pH, are contacted in a closed loop gas-liquid scrubbing zone to effect absorption of the sulfur dioxide into the waste water. A second portion of the gas stream and a second portion of the waste water are controlled in an open loop gas-liquid scrubbing zone. The second portion of the waste water contains a lesser amount of iron than the first portion of the waste water. Contacting in the openloop scrubbing zone is sufficient to acidify the waste water which is then treated to remove solids originally present


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    The soft drink production process resulting waste water contains high color, COD and TSS quality. General treatment for soft drink waste water usually using conventional method but this method became inefficient since highly cost on operational. Recent alternative method for waste water treatment is using plasma technology to decreasing the high quality of color, COD and TSS. Plasma formed in a reactor that comprises two electrodes which one connected with high voltage. The reactor resulting active species with high oxidation potential i.e. •OH, •O, •H, O3 and H2O2, and it have important role to removing organic compounds. This study is to discover the affectivity of plasma technology to degrade the quality of color, COD an TSS in soft drink waste water. Soft drink waste water treated in a rector with high voltage (16, 17, 18 kV) and circulation variation (1-6 times). The voltage and circulation variation influences the degradation of color, COD and TSS in waste water. The degradation of color, COD an TSS increases with higher voltage and more amount of circulation. The highest degradation of color, COD and TSS was attained in 18 kV with 6 circulations. The degradation percentages are 99,91 %, 98,72 % dan 98,66 whereas waste water pH before treatment reached 8 and in the end of treatment positioned around 7. The energy requirement to obtain this efficiency is 0, 0968 kWh with electrical cost is Rp. 1.473/m3. Key Word: corona discharge plasma, oxidation, active species, voltage, circulation

    Combined air and water pollution control system

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    A bioaquatic air pollution control system for controlling both water and atmospheric pollution is disclosed. The pollution control system includes an exhaust for directing polluted gases out of a furnace and a fluid circulating system which circulates fluid, such as waste water, from a source, past the furnace where the fluid flow entrains the pollutants from the furnace. The combined fluid and pollutants are then directed through a rock/plant/microbial filtering system. A suction pump pumps the treated waste water from the filter system past the exhaust to again entrain more pollutants from the furnace where they are combined with the fluid (waste water) and directed to the filter system

    Water use options for regional development : potentials of new water technologies in Central Northern Namibia

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    The CuveWaters project relates the alignment and implementation of innovative water technologies to an Integrated Water Resources Management (IWRM) in the Cuvelai-Etosha-Basin, which lies in Central Northern Namibia. The aim here is to improve inhabitants’ living conditions by means of appropriate technical schemes and measures – particularly with a view to enhancing water supply and basic sanitation (incl. waste water disposal). A focal part of Cuve-Waters concerns the re-use of water, efficient use of water and utilisation of different water qualities for different purposes (multi-resource mix). With respect to urban conditions and the problems of adequate supply and sanitation, the prospect of a semi-decentralised infrastructure system is under investigation, a concept which includes rainwater utilisation as well as waste water collection and treatment. One major option for such systems, in which waste water is considered a valuable resource, is a washing house combining effective waste water collection (vacuum sewer) with high-tech separation techniques (generation of energy, nutrients and waste water processing). Cleaned waste water – free of bacteria, viruses or pathogens – and fertiliser from an anaerobic waste water treatment plant can be re-used for irrigation in small scale agriculture to enhance food security and/or generate alternative income through the marketing of fresh produce. Energy, in the form of biogas, can be used for cooking or lighting. On the rural sites of the study area, adequate water supply poses a major challenge, for which three technology options are investigated here: rainwater harvesting, solar-coupled desalination of brackish groundwater, and managed aquifer recharge. Suitable technology options are selected for different sites in a participatory process (cf. CuveWaters Project 2008a, CuveWaters Project 2008b). Thus, general aims of the project in terms of providing regional economic impetus and improving livelihoods are: - to link integrated water resources management to land issues, develop the technology needed to build capacity, and achieve better governance; - to bring together supply- and demand-driven approaches in developing the infrastructure; - to consider water as related to other resources (land, energy, nutrients) and other fields of sustainability such as poverty reduction, equality and regional development. From these project objectives arise the key questions driving the surveys documented in this paper: what impetus for regional development can be expected from the implementation of technological options selected for the CuveWaters project? What constraints and obstacles need to be considered here, particularly in terms of incorporating the technologies into strategies of IWRM? What conclusions can be drawn when it comes to the supervision of implementation (training, capacity building, governance)? After an introduction the economic and social situation in the Cuvelai-Etosha Basin along with the conditions for urban agriculture is outlined. This is followed by the discussion of the potentials for water-related activities in the region, taking into account additional water uses and the operation and development of infrastructures, whilst investigating the potentials of urban agriculture for Central Northern Namibia. Finally, these potentials are summarized and conclusions pertaining to flanking measures for technical implementation are drawn

    Safe and Legal Fish Waste Composting in Alaska

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    This bulletin encourages soil production using fish waste, and teaches the safety and legal aspects of composting fish waste to comply with Alaska laws. If fish waste composting is done correctly, the benefits are great—improved soil, a free source of fertilizer for many years, and water quality improvement because less waste gets dumped into waterways.Ye

    Urban wastewater: A valuable resource for agriculture - A case study from Haroonabad, Pakistan

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    Waste waters / Irrigation water / Water reuse / Economic analysis / Soil properties / Households / Water availability / Water use / Water quality / Groundwater / Public health / Risks / Case studies
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