Decentralized wastewater treatment system for Lai Xa – Kim Chung Commune: A youth with a mission – mercy, relief, and development asia project in Vietnam
As Asian cities grow and develop, so too do the peri-urban areas surrounding these cities, where rural and urban aspects both play a role in the daily lives of citizens in these areas. However, these peri-urban areas often go largely unrecognized by city policymakers, who place emphasis on the urban city center for their development planning. This has resulted in some of these peri-urban areas gathering the ‘defects’ of development, such as large, polluting industries, landfills, and a lack of some of the essential infrastructure present in the city center, such as piped water or sewerage.
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Installation of Large Diameter Buried Pipes
The ProblemThere is an ongoing need to provide designers, specifiers, engineers, consultants and students an overview and general understanding on the proper installation and rehabilitation of buried municipal and industrial pipelines to provide a long-lasting wastewater and potable water infrastructure that will serve future generations. Goals and ObjectiveMost buried pipe relies on interaction with the surrounding soil to carry loads. The properly designed pipe and joining system depends on proper soil...
ON-SITE SEWAGE SYSTEMS: NEW OUTLOOK FOR DECENTRALIZED WASTEWATER TREATMENT
As researchers analyze the soils’ ability to absorb discharge, more knowledge is gained about alternatives to septic tanks and standard drain fields that include peat filter systems, constructed wetlands and drip irrigation. ONE out of every four American households currently treat and release wastewater on their own property. Although most people assume that on-site systems are confined to rural areas, in fact half are in suburbs and a few even remain within the confines of large cities. Public works engineers...
An Infrastructure Grows · Decentralized Treatment and Recycling Domestic Wastewater
THE TERM, “decentralized waste-water management,” refers to the process of treating and discharging treated wastewater in the local vicinity where it is generated. Decentralized systems typically use the soil as the final receptor of the treated wastewater instead of discharging to surface waters, which are generally the receptors of treated wastewater from larger centralized treatment plants. Wastewater is further treated in the soil; some is utilized by plants and, in many environments, much of it will recharge...
Involvement of Informal Sector in Plastic and Paper Recycling in Pakistan
The estimated figures of plastic and paper wastes generation acrose the country is about 1.32 million tonnes and 0.51 million tonnes per annum respectively. In pakistan the history of informal sector is as old as recycling itself. The main reason for the development of informal sector is increase in demand for plastic and paper products, more market of recycled products and economically viable recycling process. In Pakistan recycling is not for the sake of reduction of the pollution and landfills over utilization...
Wastewater Odors Go Under Cover
Problem: A new residential golfing community wanted to prevent odor emissions from the local wastewater treatment plant from affecting the lifestyle of its residents. Solution: Flat structural-fabric covers were installed over the treatment plant`s aeration tanks and primary clarifiers. Download the full article in pdf format (67 Kb)
Backyard Composting Evaluated in New York City
Diversion data following distribution of bins indicate that home composting probably won’t make a significant dent in New York City’s waste stream, but can more than pay its way and boost recycling awareness. New York City may not normally be associated with yards and gardens, but there are good reasons to study backyard composting’s effect on waste diversion, especially because the impending closure of the city’s last landfill in 2001 means that nearly 12,000 tons/day of residential waste will have to be...
Environmental Situation in Africa
Abstract Africa The economic and social needs of Africa depends more on its environmental resources but these natural resources are seriously declining and that is really effecting the entire region. Sustainable development in this rapidly changing region has become an imperative, and must take place in the complex context of a diverse and changing ecosystem, political transition and evolution toward market economies. The region is heading towards integrating environmental components into sectors like...
Worldwide Coastal and Oceans Woes Continue.
`The oceans are in trouble and so are we,` oceanographer Sylvia Earle, National Geographic explorer in residence and researcher for the Smithsonian, was quoted as saying in an article on the web by Seth Borenstein writing for the Philadelphia Inquirer and San Jose Mercury News Washington Bureaus. Citing a study by the Harvard Medical School`s Center for Health and the Global Environment covering 1976 to 1996, Borenstein reports a greater than fourfold increase in harmful algal blooms (74 to 329). `stranding of...
Common Treatment Technologies for Halogenated SVOCs in Soil, Sediment, and Sludge
Common treatment technologies for halogenated SVOCs in soil, sediment, and sludge include biodegradation, dehalogenation, incineration, and excavation with off-site disposal. All types of biodegradation, both in situ or ex situ, can be considered to remediate soils: in situ bioremediation, bioventing, composting, controlled solid phase, or landfarming. Slurry phase biological treatment is also applicable but is less widely used. Treatability studies should be conducted to evaluate design parameters, such as...
Common Treatment Technologies for Radionuclides in Soil, Sediment, and Sludge
Unlike organic contaminants (and similar to metals), radionuclides cannot be destroyed or degraded; therefore, remediation technologies applicable to radionuclides involve separation, concentration/volume reduction, and/or immobilization. The most commonly used treatment technology for radionuclides in soil, sediment, and sludge is solidification/stabilization (S/S). This treatment technology is described briefly below. Solidification processes produce monolithic blocks of waste with high structural integrity....
Containment for Soil, Sediment, and Sludge
Containment treatments are often performed to prevent, or significantly reduce, the migration of contaminants in soils or ground water. Containment is necessary whenever contaminated materials are to be buried or left in place at a site. In general, containment is performed when extensive subsurface contamination at a site precludes excavation and removal of wastes because of potential hazards, unrealistic cost, or lack of adequate treatment technologies. Containment treatments offer quick installation times and...
Ex Situ Thermal Treatment for Soil, Sediment, and Sludge
The main advantage of ex situ treatments is that they generally require shorter time periods, and there is more certainty about the uniformity of treatment because of the ability to screen, homogenize, and continuously mix the soils. Ex situ processes, however, require excavation of soils leading to increased costs and engineering for equipment, possible permitting, and materials handling worker safety issues. Thermal treatments offer quick cleanup times but are typically the most costly treatment group. This...
Removal of Lead from Gasoline
On 12th March 1997, the European Commission adopted a proposal from the Environment Commissioner Ritt Bjerregaard on a European Union strategy to combat acidification. The strategy will, by 2010, reduce significantly the extent of the areas in the European Union where the tolerance of sensitive ecosystems to acidity is exceeded. Main elements of the strategy include establishment of national emission ceilings for each acid rain pollutant; ratification of the UN protocol on further reductions of sulphur emissions;...
Environmental Information Systems for Tailings Management
Introduction An EU Directive is forcing waste disposal sites, such as refuse tips and landfills, to upgrade their anti-leaching precautions. This is especially the case in Sweden. Here, in its home market, Trelleborg is able to provide these sites with an environmentally friendly, seam-weldable rubber membrane to meet the stringent new requirements. An EU Directive came is now in force that strengthened the environmen-tal requirements for refuse disposal sites. Sweden`s refuse tips have for many years been...
Two Case Histories of Industrial Water Reuse Via Membrane Technology
Abstract This paper describes two successful applications of ultrafiltration (UF) and reverse osmosis (RO) membrane technology used to reclaim water, reduce waste water discharge costs. The first case history covers oily waste water treatment at a major aluminum beverage can manufacturing plant. The second case describes treatment of waste water from a multi-plating bath section of a major wheelchair manufacturing facility. The mechanisms of separation effected by both UF and RO are described at the molecular...