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Volume 09 Issue 01
  Volume 9 Issue 2 BHS-Sonthofen Inc. November 8, 2018  
     Featured Article | Technology Application | Innovations | Upcoming Events | Blog | Book

Focus:  Water Scrubbers for Pollution Control

Welcome to Year Number 9 of A&SoF. It’s November already and the holiday season is approaching.  At this time of the year, we are all pulled in many directions from finishing the project, creating capital spending plans, meeting sales numbers to family responsibilities.  When we face a tough challenge, we all want more resources – people, money, time. And there’s no doubt that you need a certain amount of all those resources to get things done. But I think it makes more sense to focus on building resourcefulness – the creativity, determination, and ingenuity required to achieve your goals when you don’t have all the resources you’d like. Resourcefulness is like muscle; a strength that you can depend on day after day; So, when you’re working under constraints, take the opportunity to build the muscle memory of doing more with less.
This issue focuses on water scrubbing.  The first article is from Chemical Engineering Progress and discusses the three main types of wet scrubbers used in the chemical process industries (CPI) to remove contaminants from gas streams and their differences and suggested applications.  The BHS article is from the American Filtration and Separations Society and looks at candle filtration to remove the contaminants from the recirculating water streams.          
As always, thanks again, to our readers, for your feedback and if you missed any issues, please click on the following link: to view them.   


Barry A. Perlmutter

Featured Article:

Consider Wet Scrubbers for Pollution Control

By Gregory D. MacLeod, P.E., The Clean Air Group LLC, CEP, October, 2018, pages 47-51.

Pollution control equipment is fundamental to chemical process industries (CPI) facilities. Scrubbers are a type of pollution control equipment that are frequently mandated by regulation to promote environmental health and safety and can help recover product. Scrubbers fall into two generalized categories, wet and dry. This article focuses on wet scrubbers, how they operate, and advantages and disadvantages of each type.
Three main types of wet scrubbers are used in the CPI today: jet venturi fume scrubbers, packed towers, and high-energy jet venturis. Each design is appropriate for certain applications, and knowing which scrubber to specify is an important part of the design process.
All of these wet scrubbers have advantages and disadvantages. For bulk removal of pollutants or removal of particles larger than 1 μm, a jet venturi can be used. For removal of fine particulates, the high-energy venturi is the best option. For streams relatively free of particulate and/or for high pollutant removal efficiencies, a packed tower can be used.
MacLeod continues by stating that “with all of these technologies, the scrubbing liquid can be recirculated. However, care should be taken when scrubbing with water alone, since recirculating increasingly dirty water will inhibit the overall pollutant removal rates.” 

BHS Technology Application:

Solid-Liquid Separation Technology for Removing Contaminant Fines from Water Scrubbing, Clarifier Effluents and Grey Water

Barry A. Perlmutter, President & Managing Director

Treating water for environmental and process benefits is becoming more important in the oil and gas, energy, bioenergy, biochemical and chemical industries. As these operations are looking to become more cost efficient, water usage is being investigated. One critical aspect of these processes is the solid-liquid separation.  This paper discusses thin-cake candle filter technology as an alternative to filter presses and bag and filter cartridges for removing solid contaminant fines from the water streams. These contaminants originate from various sources and are generally less than 1 micron (um) in size, which makes their removal very difficult. Candle filter technology and the process of thin-cake building, is a new approach for high-efficiency and cost- effective fines removal.

Read the full article on the BHS website:


BHS Rotary Pressure Filter Replaces Peeler Centrifuges for Food Additives

A manufacturer of food additives had been using three peeler centrifuges in a single production step. The manufacturer planned to replace them with three new, identical machines. At the same time, the company asked BHS to take a close look at the process step itself. When analyzing the filtration process, BHS found that the use of one rotary pressure filter would offer clear advantages to the plant operator. Compared to three high-speed centrifuges, this slowly rotating single unit required much less power, wash-liquid and maintenance. Moreover, the quantity and quality of the yield increased significantly when using a rotary pressure filter.  To read more about the BHS Rotary Pressure Filter, please see our website at:


Becoming a Filtration Troubleshooting Expert
Becoming an Expert Troubleshooter requires developing several “soft” skills over and above your technical expertise and great depth of knowledge in many areas. These characteristics include:

  • Critical thinking: Ask probing questions to everyone at the plant from operators, mechanics, to process and R&D engineers to encourage conversations
  • Excellent communication: Listen to the answers and ask the same questions in a different way or use the answers to formulate different questions and keep an open mind.
  • Empathy: Try to understand potential frustrations.
  • Motivational: Praise everyone who provided you with the answers, ideas, etc. to inspire the plant
  • Ability to teach: Look for teaching moments so problem-solving permeates through the organization.

Let us know how you troubleshoot!

Upcoming Events:

  1.  International Biomass Conference:  Atlanta, 16 – 18 April 2018, Improving Biochemical Process Operations with Continuous Pressure and Vacuum Filtration Technologies,
  1.  AICHE Process Development Division Plenary Session:  Orlando, 23 April 2018, Upgrading a Zinc Oxide Process to Continuous Vacuum Filtration from Batch Filter Presses,
  1.  World Congress on Particle TechnologyOrlando, 26 April 2018,  Real World Examples of Influences of Particles and Cake Formation on Solid-Liquid Separation Technology Operation,
  1.  Flow Forum Insights for Process Efficiency:  Chicago, 7 – 8 May 2018,  Benefits of upgrading to continuous vacuum filtration from batch filter presses,
  1.  ACHEMA 2018:  Frankfurt, Germany, 11 – 15 June 2018, Hall 5.0, Stand C-34,

Solid-Liquid Filtration Practical Guides in Chemical Engineering

BookBarry Perlmutter President & Managing Director
BHS-Sonthofen Inc.

Read the Book

Barry Perlmutter President & Managing Director of BHS-Sonthofen Inc. has written An essential guide to the basic principles and mechanisms of filtration, to ensure you make the right filtration choices.

Copyright © 2018 BHS-Sonthofen, Inc., All rights reserved.
BHS-Sonthofen, Inc.
14300 South Lakes Drive
Charlotte, NC 28273-8794
Phone:  704-845-1190

BHS specializes in thin-cake filtration, washing, and drying technologies for pressure or vacuum, batch or continuous operation for high solids and clarification applications.

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