Sludge Level

• Water & Wastes Digest - "Sludge Solutions" - September 2007
  Challenge: The West Point WWTP (Seattle, WA) needed to find a reliable blanket-level instrument to control sludge wasting from its PLC system. Solution: Entech Design's sludge level analyzer gave accurate and reliable measurements and provided the plant with continuous data. Conclusion: The plant found a cost-effective and reliable solution to problems associated with infrequent manual sludge level measurements.

• WaterandWastewater.com - BinMinder 9300 Feature Article
  January 2007 feature article of BinMinder 9300 sludge blanket level analyzer.

• San Jose/Santa Clara WWTP Evaluation - BinMinder 9300 As An Interface Level Analyzer
  This report details the evaluation of primary clarifiers at the San Jose/Santa Clara WWTP. The objective of part II of the report was to reduce the amount of time the plant would use to monitor and control the sludge level without jeopardizing efficiency of the treatment process. The article concludes that by using BinMinder 9300 the plant was able to reduce the amount of time spent monitoring the sludge level from 16 hours to 2 hours per week, while also reducing effluent TSS and BOD.

• Instrumentation Testing Association - Sludge Level Analyzer Performance Evaluation Report - Entech Design, Inc. Manufacturer's Comments
  At the completion of the evaluation, each manufacturer was provided the test data for its analyzer and given an opportunity to provide comments to be included in the final report. Manufacturers were not provided information on performance of the other instruments until the final report was released. Follow the link above for the comment letter of Entech Design, Inc. and a summary of instrument performance.

• ITA Sludge Level Analyzer Test - Review
  Online Interface/Sludge Blanket Level Analyzers Performance Evaluation Report - Review by Entech Design, Inc.

• ITA Sludge Level Analyzer Performance Evaluation Report - Tri-Fold Handout
  Highlights of recent testing by Instrumentation Testing Association of ultrasonic sludge level instruments.

• Bottom Ash Dewatering Bin Carryover Study - Learn how continual monitoring of the level of material in your dewatering bins with BinMinder 9300^TM will provide the opportunity to intelligently manage bin filling, resulting in dramatic reductions in the amount of material carryover and the reduction of system operating costs.

Media Expansion

• WaterWorld – “Media Expansion Monitoring Improves Filter Performance”
  Expansion Pro Analyzer 2000 is featured in the February 2007 issue of WaterWorld. The system is currently in operation in filters across the US ranging from small plants with several filters to a 150 mgd plant with 56 filters. The instrument is designed to measure media expansion in granular media filters during the backwash cycle.

• WaterandWastewater.com - Expansion Pro Analyzer 2000 Feature Article
  January 2007 feature article of Expansion Pro Analyzer 2000 media expansion analyzer.

• AWWA Ohio Section Spring 2006 Newsletter – “Optimizing Filter Performance”
  Within this AWWA newsletter, Michael Murphy of The Bergren Associates explains how Entech Design’s Expansion Pro Analyzer 2000 can be used to measure and control filter bed expansion. He also describes how the City of Warren in Ohio uses the EPA 2000 to aid in the control of their automated filter backwash process.

• Tech Brief - "Filter Backwashing"
  A Fall 2005 article from Tech Brief that explains in detail the what, when and how of filter backwashing. Excellent article for understanding the importance of optimizing media expansion during filter backwashing in gravity filters.

• AWWA Opflow - Bed Expansion Affects Performance A synopsis of the article: Bed Expansion Affects Performance, Opflow, Vol. 29, No. 11
  This article reports the experience of Pennsylvania Department of Environmental Protection investigators over 14 years conducting filter performance evaluations. It discusses the importance of proper backwash procedures and emphasizes the requirement of adequate media expansion to sufficiently clean the filter and prevent a variety of filter problems.

• AWWA Opflow - "Filter Backwashing; When and How"
  Reprinted from Opflow, Vol. 25, No. 3 (March 1999), by permission. Copyright © 1999, American Water Works Association. Permission to reproduce this material does not represent or imply approval or endorsement by AWWA of any product or service.

Bottom Ash

• Ash Tracker - Bottom Ash Level Analyzer
  Application note describing Ash Tracker, the solution for reliable bottom ash level control at coal-fired power stations. Ash Tracker is designed to handle the full range of bottom ash collection systems, including conventional bottom ash hoppers, slag tanks, submerged flight conveyors and step-bottom hoppers.