decentralized wastewater treatment Articles

  • Decentralized Wastewater Treatment

    An application used worldwide, now growing in US to address the needs of small communities and developments Conventional sewer operations managed by small communities provide centralized treatment of wastewater of which residents are accustomed. But the expense of operating these systems as they expand with miles and miles of sewer lines is staggering. Expanding sewer line infrastructure, ...


    By Bio-Microbics, Inc.

  • Innovative Solutions for Decentralized Wastewater Treatment

    Chlorination and UV light are currently the most common methods used for disinfection of wastewater. While these processes are generally well-adapted to community or municipal installations, their operation and maintenance needs present some limitations to assure sustainable performance at the level of individual wastewater treatment systems. As reported in many papers (U.S. EPA. 1999), use of ...


    By Premier Tech Aqua

  • The ecological filter system for treatment of decentralized wastewater

    A vertical flow constructed wetland was combined with a biological aerated filter to develop an ecological filter, and to obtain the optimal operating parameters: The hydraulic loading was 1.55 m3/(m2·d), carbon–nitrogen ratio was 10, and gas–water ratio was 6. The experimental results demonstrated considerable removal efficiency of chemical oxygen demand (COD), ammonia nitrogen ...


    By IWA Publishing

  • 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. ...


  • A new approach to implementing decentralized wastewater treatment concepts

    Planners and decision-makers in the wastewater sector are often confronted with the problem of identifying adequate development strategies and most suitable finance schemes for decentralized wastewater infrastructure. This paper research has focused on providing an approach in support of such decision-making. It is based on basic principles that stand for an integrated perspective towards ...


    By IWA Publishing

  • A Submerged Attached Growth Bioreactor for Decentralized Wastewater Treatment

    ABSTRACTThe Amphidrome® process is a submerged attached growth bioreactor (SAGB) that has been used in Massachusetts, Connecticut, Rhode Island and New Jersey for decentralized wastewater treatment systems ranging in size from 440 gpd to 150,000 gpd. The two primary advantages of a SAGB are the small volume requirement and the elimination of downstream clarification. Five years of data from four ...

  • Robust decentralized wastewater treatment for small communities…FAST®

    For many small and medium communities, centralized or conventional sewer options are technically complicated and/or are often the expensive choice for managing wastewater treatment. As the demand for water reaches critical levels for most areas around the world, decentralized treatment systems are becoming increasingly popular by returning treated water back to the local environment.  ...


    By Bio-Microbics, Inc.

  • First decentralized wastewater treatment system in Lao PDR

    Wastewater treatment as part of the sanitation system is an important environmental service that is closely linked to water management. The poor sanitation management in Lao PDR generally contributes to wastewater pollution especially in the urban areas. The major water source for urban supply is surface water since most towns are located along the rivers as groundwater ...


    By IWA Publishing

  • Introduction to Decentralized Packaged Wastewater Treatment (PWWT) Systems - PDH Article

    Learning Objectives After reading this article, you should understand: Functions and processes of a decentralized PWWT system; Design considerations of a PWWT system. Overview "Clean water will be the oil of the 21st Century." The accuracy and magnitude of this statement is resonating worldwide. ...

  • Upgrading of decentralized ponds for municipal wastewater treatment and restricted reuse

    Upgrading of a pond system for municipal wastewater treatment in a decentralized area is evaluated. The pond was constructed for the treatment of 63 m3/d. Currently it receives 83 m3/d, therefore poor treatment efficiency was recorded. An expansion of 1.6 times the present land area was required. In addition to construction, operation and maintenance were required to meet the permissible limits. ...


    By IWA Publishing

  • Introducting a New Media for Fixed-Film Treatment in Decentralized Wastewater Systems

    ABSTRACTBoth naturally occurring and artificial media have been used to treat wastewater in small community settings. Systems using naturally occurring media include sand filters and peatbased biofilters. Artificial media include open cell foam, textiles, and plastics. All the above operate as fixed-film systems, in that attached growth microorganisms are encouraged to colonize and reproduce in ...

  • 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 ...


  • Decentralized peri-urban wastewater treatment technologies assessment integrating sustainability indicators

    Selection of treatment technologies without considering the environmental, economic and social factors associated with each geographical context risks the occurrence of negative impacts that were not properly foreseen, working against the sustainable performance of the technology. The principal aim of this study was to evaluate 12 technologies for decentralized treatment of domestic wastewater ...


    By IWA Publishing

  • Domestic wastewater treatment with a decentralized, simple technology biomass concentrator reactor

    A new type of membrane-like aerobic reactor initially designed for the degradation of hydrocarbon-derived groundwater contaminants was tested for treating domestic wastewater. The biomass concentrator reactor (BCR) consists of an enclosed, aerated tank containing a graded filtration medium with the function of solids separation, and was previously used to treat industrial wastewaters ...


    By IWA Publishing

  • Decentralized wastewater management in Kieu Ky Vietnam

    1. Overview and Key Points In order to eliminate the common ‘out of sight out of mind approach’ in sanitation, whereby sewers and/or drains are discharged into rivers, a Decentralized Wastewater Treatment System (DEWATS) was designed and implemented in Kieu Ky to treat wastewaters arising residential properties and various craft industries. A clear understanding of topography, ...


    By IWA Publishing

  • Decentralized wastewater treatment systems for the Ha Phong Slaughterhouse: A BORDA-Vietnam DEWATS Project in Vietnam

    The Bremen Overseas Research and Development Association (BORDA) has a mission to improve the living conditions of disadvantaged communities and to preserve the environment through decentralized sanitation projects. As part of this mission, the Association has developed modular, decentralized, and cost-effective wastewater treatment service packages that they have termed ‘DEWATS’ ...


    By IWA Publishing

  • Technical-economical analysis of selected decentralized technologies for municipal wastewater treatment in the city of Rome

    Several wastewater treatment technologies were evaluated as alternative systems to the more traditional centralized continuous flow system to serve decentralized areas of the city of Rome (Italy). For instance, the following technologies were selected: (1) Constructed wetlands, (2) Membrane Biological Reactor, (3) Deep Shaft, (4) Sequencing Batch Reactor, and (5) Combined Filtration and ...


    By IWA Publishing

  • Treatment of wastewater from a school in a decentralized filtration system by percolation over organic packing media

    Based on results obtained in the laboratory a WWTP composed of a septic tank and an aerated percolating filter packed with organic media was built for a school. The system can treat 18 m3 d−1 and was operated with a hydraulic loading rate of 0.078 (m3 m−2 d−1). For 360 days different operational conditions including start-up; stabilization; operation with aeration and non aeration; effect of ...


    By IWA Publishing

  • A step towards decentralized wastewater management in the Lower Jordan Rift Valley

    In order to address serious concerns over public health, water scarcity and groundwater pollution in Jordan, the expansion of decentralized wastewater treatment and reuse (DWWT&R) systems to small communities is one of the goals defined by the Jordan government in the “Water Strategy 2009–2022”. This paper evaluates the general potential of decentralized wastewater system solutions to be applied ...


    By IWA Publishing

  • Decentralized Wastewater treatment systems for the sovann komar orphanage: A BORDA-Cambodia DEWATS Project in Cambodia

    The Bremen Overseas Research and Development Agency (BORDA) has a mission to improve the living conditions of disadvantaged communities and to preserve the environment through decentralized sanitation projects. As part of this mission, the Agency has developed modular, decentralized, and cost-effective wastewater treatment service packages that they have termed ‘DEWATS’ ...


    By IWA Publishing

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