clarifier drive unit Articles

  • Clarifier maintenance

    Clarifiers are expensive, to buy or repair, and their downtime can be costly in fines imposed by regulatory agencies and in community ill will. Regular maintenance, an annual inspection of the mechanism and an occasional touchup of the paint or coating system are simple and inexpensive proactive steps that will usually prevent most problems. Three components of all clarifiers require maintenance: ...


    By WesTech Engineering, Inc.

  • Ovivo Double Entry Drum Screens at Yellow River WRF, Gwinnett County, GA – Customer Testimonial

    “We completed the Yellow River WRF Improvements Project in 2012. This project replaced an aging 14.0 MGD conventional activated sludge facility with an advanced 22.0 MGD MBR facility. The MBR facility includes third party submerged fiber membrane for solids separation. The membrane manufacturer required, at a minimum, 2mm screening to protect the .04 micron membrane. We decided to purchase ...

  • Case study - Supplemental aeration nearly eliminates filamentous sludge bulking

    The Dubai Investments Park Wastewater Treatment plant in the United Arab Emirates faced challenges in their oxidation ditch due to filamentous sludge bulking, resulting in poor sludge settling in the secondary clarifier. Supplemental aeration was needed to eliminate the filamentous sludge bulking. Challenge: The oxidation ditch is treating an ...

  • Acid mine drainage treatment

    Acid mine/rock drainage is a rampant problem in the world today. The above photo depicts acid drainage at an abandoned mine in the Yukon Territory of northwest Canada. This mine shares a similar history to thousands of other mines throughout the world. It was in operation for six short years in the 1950’s, producing gold ore. Its profitability eventually failed and it was abandoned. In the ...


    By WesTech Engineering, Inc.

  • Final CISWI rule

    On March 21, 2011, in parallel with publication of the Boiler National Emission Standard for Hazardous Air Pollutants (NESHAP) rules and the Non-Hazardous Secondary Material (NHSM) rule, EPA promulgated the final updates to the New Source Performance Standards (NSPS) and Emission Guidelines (EG) for Existing CISWI Units, collectively referred to as the “2011 CISWI Rules.”1 The 2011 ...


    By Trinity Consultants

  • Nano disclosures: too small to matter or too big to ignore?

    Determining whether the presence of nanoscale materials in chemical substances, mixtures, and articles triggers a disclosure obligation is complicated. The decision turns on a calculus that includes what law applies, what is known about the presence of nanoscale components, what knowledge standard applies, whether and how a nanoscale material is defined, and an entity’s interpretation of ...


    By Bergeson & Campbell, P.C.

  • 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. ...

  • Field Performance Testing for Pipeline Pumps

    Significant energy savings can be achieved by optimizing pump operating efficiency. Measuring the exact pump performance with crude oil under realistic conditions in the field is the first step towards improving the pump efficiency in the future. About 20 billion barrels of crude oil were transported through pipelines in 2015. Around the world, there are over one million kilometers of ...


    By Sulzer

  • 4 Things Germany and partners can do to strengthen the international renewable energy club

    After winning Germany’s federal elections on September 22nd, Chancellor Angela Merkel is in the middle of difficult coalition talks to form a new government. Because Merkel’s party, the Christian Democrats, did not win an absolute majority in parliament, it must find a new coalition partner. The party has begun negotiations with Social Democrats to form a grand coalition. Importantly, ...

  • The new climate economics

    This post was written by Lord Nicholas Stern, president of the British Academy, and Felipe Calderón, former president of Mexico and a WRI Board member. It originally appeared on Project Syndicate. This Friday, in its latest comprehensive ...

  • Where do renewable energy purchases fit into a GHG inventory?

    I recently presented at the 7th Product Carbon Footprint (PCF) World Forum Summit, a gathering of experts brought together by Berlin-based think tank Thema1 “to foster and facilitate international discussion on how to assess, reduce, and communicate the impact of goods and ...

  • Methods of Water Purification

    This article is excerpted from 'Pure Water Handbook' published by Osmonics®, Inc. of Minnetonka, Minnesota USA and is printed with permission of Osmonics, Inc. Water treatment can be defined as any procedure or method used to alter the chemical composition or natural 'behavior' of a water supply. Water supplies are classified as either surface water or groundwater. The majority of public or ...

  • EPA Proposed “Franken-MACT” for Utilities

    EPA published the highly anticipated proposed Maximum Available Control Technology (MACT) Standard for the utility sector (40 CFR 63 Subpart UUUUU). When considered together with the growing list of proposed and final rules impacting the utility sector (Transport Rule/Cross-State Rule, Coal Combustion Byproducts Rule, Cooling Water Intake Rule, Regional Haze Rule, revised National Ambient Air ...


    By Trinity Consultants

  • New Products Archives

    Product: PURELAM® A-9000/A-9010 solventless laminating adhesive Manufacturer: Ashland Specialty ...


    By Actio Corporation

  • Odor Control Advances at Composting Facility

    The Rockland County (New York) Cocomposting Facility began operations in February, 1999, processing biosolids from the five publicly owned treatment works (POTWs) in the county. The Rockland County Solid Waste Management Authority (RCSWMA) owns the facility, but contracted with Waste Management of New York to design, build and operate (DBO) the 110 wet tons/day agitated bin composting facility ...


    By BioCycle Magazine

  • Predictions for EPA`s Office of Chemical Safety and Pollution Prevention

    The Acta Group's (Acta) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation is currently rife ...


    By Acta Group

  • 2013 Predictions for EPA`s Office of Chemical Safety and Pollution Prevention

    The Acta Group's (Acta) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation is currently rife ...


    By Acta Group

  • 2013 Predictions for EPA`s Office of Chemical Safety and Pollution Prevention

    Bergeson & Campbell, P.C.'s (B&C) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation ...


    By Bergeson & Campbell, P.C.

  • Predictions for EPA`s Office of Chemical Safety and Pollution Prevention

    Bergeson & Campbell, P.C.'s (B&C) thoughts are below on what may be headed our way in 2013 from the U.S. Environmental Protection Agency's (EPA) Office of Chemical Safety and Pollution Prevention (OCSPP). Although the 2012 Presidential Election is over, environmental issues will continue to be used to make distinctions between the two parties (or between the House and Senate). Speculation ...


    By Bergeson & Campbell, P.C.

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