water quality control Articles | Environmental XPRT

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

Recycled Water Quality

Matching recycled water quality to beneficial uses requires an understanding of health and environmental requirements. Measures to achieve appropriate recycled water quality are determined firstly by treatment. The degree of treatment depends in part on the source and the hydraulic and biochemical characters of the wastewater. Overall recycled water outcomes may also be controlled ...

Apr. 2, 2012

By IWA Publishing

Drinking Water Quality

The quality of drinking-water is a powerful environmental determinant of health. Drinking-water quality management has been a key pillar of primary prevention for over one-and-a-half centuries and it continues to be the foundation for the prevention and control of waterborne diseases. Water is essential for life, but it can and does transmit disease in countries in all continents – from the ...

Mar. 8, 2012

By IWA Publishing

Water Quality Models

' In order to determine the impacts of a particular discharge on ambient water quality, it is usually necessary to model the diffusion and dispersion of the discharge in the relevant water body. The approach applies both to new discharges and to upgrading of existing sources. This note provides guidance on models that may be applicable in the context of typical Bank projects.' Introduction ...

Jan. 1, 1997

By The World Bank

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

Control water – control mold

There is no single universal way to eliminate all mold growth. But the single most effective method of controlling mold is to eliminate their source of moisture. Moisture doesn’t just mean actual water; it can also be high humidity. Few molds grow when the humidity is under 70%. If they do, it is very slowly. It is safe to say that you cannot stop mold growth until you stop the moisture. ...

Jul. 5, 2010

By Atlantic Environmental, Inc.

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

Simultaneous corrosion control and water quality improvement in water distribution systems

The effects of different dosages of sodium hexametaphosphate and sodium orthophosphate on corrosion inhibition and water quality in two model water distribution systems, and the corrosion inhibition mechanism on pipe walls were investigated. Results show that adding sodium hexametaphosphate and sodium orthophosphate can not only provide a remedy for the damaged cement coating surface, but ...

Jan. 1, 2017

By IWA Publishing

Quality assurance and Quality control technical note

Introduction For almost 50 years HYDROLAB products have provided dependable sensor technology in a multiple parameter instrument for montioring essential indicators required for assessing water quality in natural waters. Useable data are the lifeblood of any environmental water quality monitoring program and variation in measurement processes impairs the quality of the data that water ...

Jun. 2, 2017

By The OTT Hydromet Group

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

Hydrodynamic Cavitation Pilot Study for Controlling Cooling Water Quality

A field study was conducted on a cooling-tower system at an automotive manufacturing facility to evaluate the performance of a VRTX hydrodynamic cavitation device for disinfection, scaling, corrosion, and heat-transfer efficiency.Primary findings are:The VRTX unit performed as well as the chemical program that it replaced in terms of bacterial control without adding any chemicals (including ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Control Algae and Improve the Water Quality in Waste Stabilization Ponds

Due to population growth, accelerated urbanisation and economic development, the quantity of waste water generated is increasing globally. Mainly in low-income areas, a large proportion of the waste water is discharged directly in the environment. When the waste water is treated, the treatment plants may not remove certain pollutants that can have a negative impact on the people and ecosystem. ...

Mar. 21, 2017

By LG Sonic

Tools to improve water quality

This post is part of a series on World Water Week, an annual event designed to draw attention to and discuss global water issues. Read more posts in this series. Agricultural production often comes at the expense of water quality. As my colleague, Mindy Selman, ...

Aug. 28, 2012

By World Resources Institute WRI

Water quality in the Arosa Bay

Background One of the great impediments to further development of shellfish aquaculture in the north-west region of Spain isa perception that industry expansion and tourism could have negative environmental effects on the coastal waters. Especially the bay around Villagarcia de Arosa is very famous because of its excellent areas for shellfish farming. The government of Spain is ...

May 6, 2010

By The OTT Hydromet Group

Water quality measurement extreme

Background The characteristics of the Rio Tinto in the south-west of Spain, near Sevilla, are his ruby colour and the extremely sour pH-value between 0 and 2 pH-units. The river carries a mixture between poisonous heavy metals like copper, nickel, arsenic, iron and cadmium, dissolved in high-percent sulphuric acid. It’s not proved where these unusual conditions come from. As per current ...

May 6, 2010

By The OTT Hydromet Group

Water Quality & Treatment Centers

A look at the quality of water and the importance of inspecting the integrity of water treatment centers. Water…clear…cold…refreshing. It’s often your “go-to” beverage for quenching thirst after a vigorous activity. We are very fortunate that often within arm’s reach, rests a glass of water. Without hesitation or worry, you can pick it ...

Dec. 21, 2016

By Deep Trekker Inc.

Application of water quality indices to define surface water quality in Tehran

Tehran is one of the capitals of the world that is not situated around a river, therefore surface water discharges into a network of natural streams and even some artificial canals. Owing to the lack of sewerage system, part of the sewage runs to the network of streams without any control. The aim of this work is to identify a baseline for the water quality, which will then help policy-makers and ...

Feb. 8, 2009

By Inderscience Publishers

Real-time control of combined surface water quantity and quality: polder flushing

In open water systems, keeping both water depths and water quality at specified values is critical for maintaining a ‘healthy’ water system. Many systems still require manual operation, at least for water quality management. When applying real-time control, both quantity and quality standards need to be met. In this paper, an artificial polder flushing case is studied. Model Predictive Control ...

Feb. 1, 2010

By IWA Publishing

On the usage of artificial neural networks in chlorine control applications for water distribution networks with high quality water

Artificial neural network (ANN) methodology has found some recent applications as efficient control tools for satisfying free residual chlorine (FRC) levels at critical locations of water distribution systems. This particular research was started to critically investigate the potential and applicability of the ANN approach as a tool for controlling FRC levels for complex water distribution ...

Feb. 1, 2011

By IWA Publishing

Biofilm Control for Industrial Waters

Industrial operations can face a number of serious problems due to bacterial Biofilms growing in process water systems and cooling tower waters. Biofilm-induced corrosion, mechanical blockages and impedance of heat transfer processes result in huge monetary losses each year. In engineered systems, additional risks of biofilm-mediated contamination include negative public health consequences and ...

Apr. 27, 2015

By MIOX Corporation - Johnson Matthey`s Water Technologies

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