Clarification Process Articles on Environmental XPRT

Clarification of algae-laden water using electrochemical processes

Algae contamination of surface water and drinking water supplies is a significant problem particularly in rural areas. A decentralized inexpensive technology that would effectively remove algae from water would be beneficial. Electrocoagulation (EC) combined with electroflotation (EF) as a single process (ECF) is a promising algae harvesting technique with no moving parts that may be powered ...

Sep. 16, 2015

By IWA Publishing

A simple empirical model for the clarification-thickening process in wastewater treatment plants

In wastewater treatment plants (WWTPs), activated sludge is thickened in secondary settling tanks and recycled into the biological reactor to maintain enough biomass for wastewater treatment. Accurately estimating the activated sludge concentration in the lower portion of the secondary clarifiers is of great importance for evaluating and controlling the sludge recycled ratio, ensuring smooth and ...

Feb. 26, 2015

By IWA Publishing

Operating Chemically Enhanced Clarification for Optimum Disinfection Performance

ABSTRACTThe Milwaukee Metropolitan Sewerage District conducted demonstration tests in 2005 to evaluate chemically enhanced clarification (CEC) of wet-weather flows at the District’s two wastewater treatment plants (WWTPs). CEC offers the potential to treat intermittent high wetweather flows, produce high-quality effluent, and fit into the limited space at the plant sites. Two CEC processes were ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Biologically and Chemically Enhanced Clarification for Improved Treatment of Wet-Weather Flows

The Milwaukee Metropolitan Sewerage District (MMSD) conducted demonstration testing in 2005 to evaluate high-rate chemically enhanced clarification (CEC) followed by ultraviolet (UV) disinfection, for the treatment of wet-weather flows at MMSD’s two wastewater treatment plants (WWTPs). High-rate CEC—surface overflow rates greater than 20 gallons per minute (gpm) per square foot (ft2) [85 cubic ...

Oct. 13, 2007

By Water Environment Federation (WEF)

Rusko Water Treatment Works, Tampere, Finland: AquaDAF® Clarification System

Situation: In the 1960’s, the City of Tampere, Finland began drawing water from Lake Roine when the quality of water from its original lake source deteriorated. A horizontal sedimentation basin was constructed in the early 70’s and a laminar flotation process was implemented in 1989. Activated carbon replaced sand filtration in 1996, but the City was still not satisfied with its drinking ...

Feb. 15, 2008

By Degremont Technologies - a subsidiary of Suez Environnement

Certification of road weather sensors with DIN EN-15518 – a clarification

When driving attentively on the motorways you can discover a lot of road sensors. There are stationary sensors embedded into the road surface or – for some years now -non-invasive ones, which sometimes are the only solution to generate measurement data on bridges. Recently also mobile road sensors, installed on driving vehicles, were added to this list. The European ...

May 28, 2015

By G. Lufft Mess- und Regeltechnik GmbH

Flocculation-Flotation vs. MBR for High MLSS Secondary Clarification

Abstract Rendering plants produce high strength wastewater with high TSS, FOG, BOD and TKN. At one such plant it was decided to install a primary DAF followed by an anaerobicanoxic-aerobic treatment system for TSS, FOG, TKN and BOD removal. Since wastewater is a high strength (TSS up to 10,000, FOG up to 3,000, TKN up to 350 and BOD up to 6,000 mg/l, respectively, bioreactors will produce ...

Jan. 1, 2014

By Clean Water Technology, Inc.

Pilot Study Application of Tertiary Clarification and Filtration to Meet Proposed Ultra Low Phosphorous Discharge Limits on The Spokane River

The Spokane River flows through northern Idaho and eastern Washington. The Washington State Department of Ecology is proposing to implement an interim phosphorous TMDL (total maximum daily load) of 50 ppb, and a final TMDL of 10 ppb on all point source discharges to the river. Biological treatment alone is not sufficient to meet these levels, requiring the addition of tertiary physical/chemical ...

May 7, 2007

By Water Environment Federation (WEF)

Simultaneous clarification and endogenous post denitrification by up-flow through a layer of floating media

KeywordsBiological nutrient Removal, Post denitrification, Clarifier design, Pilot study IntroductionMethods to comply with the most updated low effluent total nitrogen (TN) regulations include, in addition to a high internal circulation ratio to a pre-denitrification stage, either a large intermediate anoxic zone, or a post denitrification stage with ...

Oct. 5, 2009

By Aqwise Wise Water Technologies

GRI,IIB, SASB GRI,IIRC and SASB Framework confusion. Is more synergy and clarification required?

GRI,IIB, SASB GRI,IIRC and SASB Framework confusion. Is more synergy and clarification required? Coralie Ponsinet discovers. There is certainly a degree of confusion ‘on the ground’ about the Global Reporting Initiative (GRI), International, Integrated Reporting Council (IIRC) and Sustainability Accounting Standards ...

Aug. 20, 2014

By IMS Consulting (Europe) Ltd

Treatment of Oily-Waste Process Streams

Standard oily-wastewater remediation relies on API 650 for oily-wastewater separation (O/W/S) treatment using gravimetric lagoon separation, then reprocessing the recovered floatable slop oil, followed by chemical flocculation, then reprocessing the recovered oily sludge, followed by dissolved air flotation (DAF), then using holdingpond clarification of supernatant wastewater, before ...

Aug. 1, 2007

Wastewater Treatment for a soft drink processing company

Description of the plant The wastewater from production and filling of mineral waters and soft drinks is pre-treated mechanically by a screen and buffered in an aerated mixing and balancing reactor. After equalization of flow and load the wastewater is given to the biological reactors where organic substances as sugar and other organic compounds are decreased by biological activity of ...

Oct. 24, 2012

By TIA – Technologies for Industrial-Wastewater Treatment GmbH

Process Alternative Comparisons Assisted with Biowin Modeling

ABSTRACTPermitted at 6.4 mgd on an annual average day basis, the City of Avondale Wastewater Treatment Plant currently employs Nitrification/Denitrification process to produce effluent with maximum total nitrogen of 10 mg/L. The process consists of Aeration Basins followed by Secondary Clarifiers to treat the screened influent after the grit removal. On the solids handling side, the Wasted ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Reusing water for industrial processes and irrigation in Saudi Arabia

Water is a scarce resource in Saudi Arabia and the public administration and private companies implement water reuse whenever possible. A reverse osmosis plant installed in the Eastern Province of Saudi Arabia helps to treat industrial waste water streams to quality levels that permit water reuse for industrial applications and irrigation. Kemira KemGuard antiscalant is used to prevent deposit ...

Dec. 9, 2014

By Kemira Water Solutions, Inc.

Microfiltration vs Ultrafiltration Processes: What is the Difference?

Microfiltration (MF) and ultrafiltration (UF) are both processes by which a contaminated liquid is passed through a semipermeable membrane that removes solids too large to fit through the membrane’s pore size, yielding a purified liquid stream. To what degree the stream is purified depends on the contaminants present and the pore size of the membrane. MF and UF are generally ...

Mar. 9, 2017

By SAMCO Technologies, Inc.

GEM + UASB: Tortilla Processing - Case Study

Introduction ...

Dec. 16, 2016

By Clean Water Technology, Inc.

Reverse Osmosis vs Nanofiltration Membrane Process: What Is the Difference?

Reverse osmosis (RO) and Nanofiltration (NF) are physical separation technologies used to remove contaminates from liquid streams. In recent years, RO/NF technologies have become more efficient and affordable for use across a variety of industrial applications, including ...

Apr. 20, 2017

By SAMCO Technologies, Inc.

Laboratory Califier Test to Predict and Optimize Full Scale Chemically Enhanced Primary Treatment (CEPT) Process

INTRODUCTIONThe overall objective of this research was to develop a laboratory clarifier test to predict fullscale primary clarifier performance. This test was developed by simulating surface overflow rate (SOR) and flocculation time, which are the limiting parameters for primary clarification. This study describes the development of a procedure to predict full-scale NSS (Non-Settleable Solids) ...

Oct. 22, 2006

By Water Environment Federation (WEF)

On-site evaluation of the removal of 100 micro-pollutants through advanced wastewater treatment processes for reuse applications

The next challenge of wastewater treatment is to reliably remove micro-pollutants at the microgram per litre range in order to meet reuse applications and contribute to reach the good status of the water bodies. A hundred priority and relevant emerging substances were measured to evaluate at full-scale the removal efficiencies of seven advanced treatment lines (one membrane bioreactor process and ...

Jan. 1, 2011

By IWA Publishing

Optimization of A2O BNR processes using ASM and EAWAG Bio-P models: model formulation

This study is an extended and comprehensive analysis to accomplish optimal sizing for a biological nutrient removal (BNR) system with an A2O BNR activated sludge process using activated sludge models (ASM) kinetic models. A highly nonlinear activated sludge model combined with the EAWAG Bio-P module is formulated and optimized using a generalized reduced gradient solver. Primary and final ...

Feb. 1, 2011

By IWA Publishing

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