water quality control Articles | Environmental XPRT

Sustainable agriculture and water quality control: a structural approach

This paper reports on research empirically focused on the Brittany region in France, its agricultural sector and the impacts of agricultural activity on water quality. Our goal was to define and estimate indicators that illustrate the confrontation between environmental performance and economic cost criteria, in the context of a comparative scenario analysis related to the growth and ...

Mar. 19, 2007

By Inderscience Publishers

Los Angeles River and Ballona Creek Stakeholder-Led Total Maximum Daily Load (TMDL): A Comprehensive Collaboration for Water Quality Improvements and Beyond

In response to the 1999 Consent Decree resulting from Heal the Bay, et al. vs. United States Environmental Protection Agency (USEPA), Total Maximum Daily Loads (TMDLs) for water bodies in the greater Los Angeles (LA) basin were required to be developed on an aggressive schedule. The first one, the Trash TMDL, was developed in the absence of a collaborative stakeholder involvement effort and was ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Robust water quality controller for a reverse osmosis desalination system

This paper presents two-degree-of-freedom (2-DOF) robust loop-shaping control methodology to stabilize a reverse osmosis (RO) desalination system operating under significant uncertainties, external disturbances and measurement noises, and to reduce product water cost. This method has the advantages that no information about the plant uncertainty is required and it can deal with external ...

Sep. 16, 2015

By IWA Publishing

Drinking water quality control: control charts for turbidity and pH

Water treatment processes are required to be in statistical control and capable of meeting drinking water specifications. Control charts are used to monitor the stability of quality parameters by distinguishing the in-control and out-of-control states. The basic assumption in standard applications of control charts is that observed data from the process are independent and identically ...

Sep. 26, 2016

By IWA Publishing

A coupled model for water resources allocation regarding water quality control

In this study, a fuzzy credibility constrained programming (FCCP) model is developed for water quantity and quality management with uncertainties in water quality parameters. The proposed method could reflect not only inexact uncertainties in the objective function, variables and parameters, but also fuzzy uncertainties in the right-hand side. Credibility levels which represent satisfaction ...

Jun. 6, 2015

By IWA Publishing

Challenges in the use of science for sustainable development

This paper summarises some of the challenges to science that are posed by the search for sustainability. These challenges are not only technical ones, such as more affordable or reliable equipment for health care, water quality control and refrigeration. There are also fundamental empirical and methodological challenges, such as complexity, irreversibility and uncertainty over the long term, that ...

May 11, 2004

By Inderscience Publishers

Stakeholder developed total maximum daily loads

Located in Ventura County California, the Calleguas Creek Watershed (CCW), though relatively small in area, suffers from more water quality impairments than most California watersheds, as defined by the USEPA’s 303(d) list. Local stakeholders, along with the Los Angeles Regional Water Quality Control Board (LARWQCB), began a watershed planning process over eight years ago to develop a better ...

Oct. 13, 2007

By Water Environment Federation (WEF)

GC-MS/MS Analysis of Pesticides in Drinking Water

According to Japan’s list of drinking water quality control substances, pesticides are included as supplemental items subject to analysis. Designed to complement the standards, the Ministry of Health, Labour and Welfare encourages water utilities to monitor pesticide levels and achieve specified targets. Among the 102 listed pesticides, 84 are simultaneously analyzed using solid-phase ...

Oct. 2, 2014

By Shimadzu Scientific Instruments Inc

Sediments as a non-point source of nutrients to Malibu Lagoon, California (USA)

Untitled Document Malibu Lagoon is a 7.5 ha (18.5-acre) brackish water coastal lagoon situated at the base of the Malibu Creek watershed in Los Angeles County, California. Land use changes in the Malibu Creek watershed have lead to increased freshwater and nutrient loads to the Lagoon and have resulted in a decline in the Lagoon’s wildlife beneficial uses. In ...

Nov. 1, 2004

By Southern California Coastal Water Research Project Authority (SCCWRP)

Municipal Stormwater Program Audits in California: Findings and Lessons Learned

ABSTRACT EPA, with the assistance of Tetra Tech and the California Regional Water Quality Control Boards, has conducted 122 on-site audits of municipal stormwater programs over past six years to assess NPDES permit compliance and program effectiveness. Evaluations consisted of a programmatic review of individual MS4s and an in-field verification of these program elements. The project goals of ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Verification of automatic coagulant dosage control technology based on aluminum concentration at a water purification plant

An automatic coagulant dosage control technology for water purification plants was developed to deal with rapid changes of feed water quality. Control logic was developed to decide coagulant dosage based on aluminum concentration in the mixing tanks. A coagulant-sedimentation process apparatus was installed in December 2010 in a water purification plant, and the coagulant dosage control test ...

Feb. 4, 2015

By IWA Publishing

Dynamic simulation of water resource management focused on water allocation and water reclamation in Chinese mining cities

Mining cities have undergone the process of extensive exploitation, which always results in a series of water issues. Integrated water resource management is necessary in improving water supply, allocation and quality without damaging economic development. This article constructs a linear optimization model including a ‘Top-Down’ socio-economic mode, and ‘Bottom-Up’ water quality control and ...

Jan. 5, 2016

By IWA Publishing

Finding your way off the 303(d) list – a success story on the Harding Drain

The Turlock Irrigation District (TID) provides irrigation water to agricultural lands in areas near Turlock, California. The Harding Drain, which is part of the TID system, is a constructed agricultural drain that collects and conveys discharges from several types of sources, including runoff from agricultural and urban areas and effluent discharges from the Turlock Regional Water Quality Control ...

Oct. 13, 2007

By Water Environment Federation (WEF)

How the palo alto regional water quality control plant incorporated environmental sustainability into its wastewater treatment planning

ABSTRACT This study documents the life cycle assessment which the Palo Alto Regional Water Quality Control Plant conducted to assess the environmental sustainability of ultraviolet versus chlorine disinfection and presents how the results of this environmental evaluation factored into the selection of the RWQCP’s preferred alternative. This information is being shared in order to provide those ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Why Wait Until Tomorrow To Know Today`s Water Quality?

As water management continues to move to the forefront of worldwide resource concerns, better information is required to facilitate effective decision making. Not only does the information have to better, it also has to be obtained faster and from multiple locations. When public health is at stake, the results must come quickly. Heterotrophic Plate Counts and other culture-based tests have ...

Jan. 8, 2013

By LuminUltra Technologies Ltd.

Norwegian study on microbial source tracking for water quality control and pollution removal in constructed wetland treating catchment run-off

This study describes the first Norwegian microbial source tracking (MST) approach for water quality control and pollution removal from catchment run-off in a nature-based treatment system (NBTS) with a constructed wetland. The applied MST tools combined microbial analyses and molecular tests to detect and define the source(s) and dominant origin(s) of faecal water contamination. Faecal ...

May 19, 2017

By IWA Publishing

Performance of a dual-power, multicellular, aerated lagoon system in Corcoran, California

A dual-power, multicellular, aerated (DPMC) lagoon system was designed and constructed for the city of Corcoran, California. The new process brought the plant into a full compliance with California Regional Water Quality Control Board (CRWQCB) effluent limits while saving approximately $110,000 per year in energy costs. The project was a modification of an existing aerated/ facultative (A/F) ...

Apr. 1, 2010

By Environetics, Inc.

Water quality monitoring in wetland ecosystems using microbial model communities

This study reviews the concept of model communities for water quality assessment in aquatic ecosystems. The feeding habits of protozoans were used to unite species into functional, trophic groups. Colonising communities were dominated by bacterivorous Flagellate Species (Sf). A new Index of Periphyton Flagellates (IPF) as an indicator of the trophic status of a water-body was developed. ...

Sep. 28, 2007

By Inderscience Publishers

Costs and Socio-Economic Benefits associated with the Natura 2000 Network

The study on the costs and benefits of Natura 2000 undertaken by IEEP and partners was designed to support the European Commission in obtaining an accurate estimate of the costs of managing the network compared to its benefits. Building on the results of an extensive consultation process, the annual costs of implementing the Natura 2000 network were estimated at €5.8 billion per year for the ...

Nov. 23, 2010

By Institute for European Environmental Policy (IEEP)

Water quality management of aquifer recharge using advanced tools

Managed aquifer recharge (MAR) with recycled water or other alternative resources is one of the most rapidly growing techniques that is viewed as a necessity in water-short areas. In order to better control health and environmental effects of MAR, this paper presents two case studies demonstrating how to improve water quality, enable reliable tracing of injected water and better control and ...

Jan. 1, 2011

By IWA Publishing

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