Showing results for: on-site wastewater treatment Articles
-
Institutional trajectory for diffusing on-site wastewater treatment in urban China
Urban water scarcity has been an issue for a long time in China while water pollution has attracted more and more attention over the last two decades. Recently, on-site wastewater treatment (OST) has been proposed as a meaningful alternative to deal with both water pollution and water scarcity in cities in a more sustainable way. However, the diffusion of such an OST system is still slow and ...
-
Advanced On-site Wastewater Treatment for Greenfield and Retrofit Applications
Many owners and operators of traditional decentralized municipal wastewater treatment plants, also referred to as on-site or off-grid treatment, are acutely aware their systems are at risk of becoming obsolete. These systems include septic fields, lagoons, oxidation ditches, ponds, rotating biological contactor (RBC) mechanisms, and sequencing batch reactor (SBR) processes. In this white paper, ...
-
Modeling on-site wastewater treatment system performance fragility to hydroclimate stressors
Increasing variability of climate-related factors, especially precipitation and temperature, poses special risks to on-site wastewater treatment systems (OWTS), which depend on subsurface saturation conditions for treatment and dispersion of wastewater. We assess OWTS fragility – the degree to which a system loses functionality – as a step to characterizing the resilience of residential ...
-
The development of a Code of Practice for single house on-site wastewater treatment in Ireland
The performance of six separate percolation areas was intensively monitored to ascertain the attenuation effects of unsaturated subsoils with respect to on-site wastewater effluent: three sites receiving septic tank effluent, the other three sites receiving secondary treated effluent. The development of a biomat across the percolation areas receiving secondary treated effluent was restricted on ...
-
Phosphorus sorption capacity of filter materials used for on-site wastewater treatment determined in batch experiments–a comparative study
Received for publication April 25, 2008. Increasing numbers of filter materials have been proposed as suitable media for P removal in on-site wastewater treatment systems. The phosphorus sorption capacity (PSC) of the material can be estimated in batch experiments and is commonly used as the criterion for material selection. However, there is no standard procedure and batch experimental ...
-
Development of a geographic information system-based decision support toolset to assess the feasibility of on-site wastewater treatment and disposal options in low permeability subsoils
Traditional on-site wastewater treatment systems have proven to be unsuitable in areas of low permeability subsoils, representing a risk to human health and the environment. With large areas being covered by low permeability tills, Ireland needs to consider alternative treatment and disposal options to be able to allow further development in these areas and to deal with polluting legacy sites. ...
-
A simulation of the fate of nitrogen in an on-site wastewater treatment system
An experiment to study and to build a mathematical model to reproduce the behavior of nitrogen in a residential wastewater treatment process was performed. A pilot unit receiving grey and black water was used. The pilot consisted in a septic tank followed by a fixed-film, partly aerated bioreactor with effluent recirculation operated under two different scenarios: normal operating conditions and ...
-
Cocopeat Biofiltration Systems
A cocopeat biofilter system is a low-cost and low-maintenance on-site wastewater treatment solution that is modular in design and applicable for residential, institutional and commercial establishments. The system can be designed to passively treat septic tank effluent to meet secondary treatment levels. For residential use, the biofilter unit consists of a relatively small ...
-
Why More Enterprises and Communities Should Turn to Decentralized Wastewater Treatment
Decentralized wastewater treatment solutions aren’t limited to domestic services. As industrial effluent regulations become more stringent, many enterprises can turn to decentralized, on-site wastewater treatment. There are various advantages to implementing this solution, and specific industries can greatly benefit from doing so. However, before diving into those details, it’s ...
-
Effect of alternative on-site wastewater treatment on the viability and culturability of Salmonella choleraesuis
ABSTRACTThe objective of this study was to determine how alternative on-site wastewater treatment systems (i.e. subsurface flow constructed wetlands, intermittent sand filters and intermittent peat filters) affect the viability and culturability of Salmonella choleraesuis (serotype typhimurium, ATCC 23567). Influent was a high strength septic tank effluent (BOD5 240-344 mg L−1, TN ...
-
Linking sanitation and wastewater treatment (WST)
In both developed and developing countries, centralised and on-site wastewater treatment systems have been developed for a long time. The main function of the wastewater treatment plants (WWTPs) should be removal of pollutants including organic carbon, nitrogen and phosphorus. Technologies applied to WWTPs are mostly with biological functions such as activated sludge, stabilization reservoir, ...
-
A concept for planning and management of on-site and centralised municipal wastewater treatment systems, a case study in Bangkok, Thailand. I: Pollutant discharge indicators and pollutant removal efficiency functions
The concept of pollution load indicators for planning and management of the mixture conditions of centralised and on-site wastewater treatment systems has not been discussed in detail so far. In this paper, pollutant discharge (load) indicators and pollutant removal efficiencies were quantitatively analysed to develop a part of a strategy for planning and management of municipal wastewater ...
-
How to Deal With Challenging Food Industry Wastewater
Waste-to-energy technology converts its high organic into biogas for operations or sale Food production wastewater streams can be some of the most challenging and expensive to treat. Their composition varies wildly from one application to the next, but one characteristic applies to most food industry wastewater: high organic load. Food production wastewater requires expensive, complex, ...
-
Evapotranspiration bed system for the wastewater from scenic and environmentally sensitive areas
The Onsite Wastewater Treatment (OWT), also commonly known as Septic Tank System, is supposedly to provide adequate treatment for individual private dwellings. In reality, because of its poor efficiency and lack of sound engineering design, the OWT has become a modern façade to pollute the land and groundwater resource. The evapotranspiration bed (ET-bed) system can effectively treat ...
-
Long-term hygienic barrier efficiency of a compact on-site wastewater treatment system
Received for publication September 11, 2008. The long-term use of a filter-based, on-site wastewater treatment system increases nutrient discharge to receiving waters and may reduce its hygienic barrier efficiency. The main purpose of this research was to assess the hygienic barrier efficiency and the associated health risks of an on-site system that had exceeded its 5-yr design capacity with ...
-
Assessment of the impact of traditional septic tank soakaway systems on water quality in Ireland
One of the key threats to groundwater and surface water quality in Ireland is the impact of poorly designed, constructed or maintained on-site wastewater treatment systems. An extensive study was carried out to quantify the impact of existing sites on water quality. Six existing sites, consisting of a traditional septic tank and soakaway system, located in various ranges of subsoil ...
-
A concept for planning and management of on-site and centralised municipal wastewater treatment systems, a case study in Bangkok, Thailand. II: Scenario-based pollutant load analysis
Scenario-based pollutant load analysis was conducted to develop a part of a concept for planning and management of wastewater treatment systems (WWTSs) under the mixture conditions of centralised and on-site WWTSs. Pollutant discharge indicators and pollutant removal efficiency functions were applied from another paper in the series, which were developed based on the existing conditions in ...
-
On-site industrial wastewater treatment
Priority pollutant behaviour in on-site treatment systems for industrial wastewaters The majority of wastewaters deriving from the chemical industry consist of aqueous discharges produced during the physico-chemical processing of synthetic mixtures involving operations such as filtration, centrifugation, extraction and/or distillation. The wastewater streams, referred to as ‘process ...
-
Factors affecting the performance and risks to human health of on-site wastewater treatment systems
Aerobic wastewater treatment systems (aerobic systems) are the preferred choice in a region overlying a karstic aquifer used for drinking water supplies, as they are thought to provide better protection to groundwater and human health than standard septic systems. However, aerobic systems in operation do not always perform to design standard; while this is often blamed on lack of maintenance, few ...
-
On-site treatment of domestic wastewater using a small-scale horizontal subsurface flow constructed wetland
A small-scale horizontal subsurface flow constructed wetland, located in North Greece, was designed and constructed to treat wastewater from a single-family residence. A three-year monitoring program was undertaken to evaluate the performance of this system. The monitoring campaigns were organized every 7 days. Water quality samples were collected at the inlet, at intermediate points (i.e. at the ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you