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Volume 8, Issue 3                                                                                                            
In This Issue:

This issue will focus on the filtration applications for zeolites and clarifiers.   

Welcome to Year Number 8 of A&SoF. As we look back on the eight years, one fact remains the same: sometimes filtration is more “art” than “science”.  This year A&SoF will focus on the art of filtration through case studies and creative problem solving. 

It is also year 3 of my blog (  This month’s blog is “Scaffolding for Creativity in Business.”

This issue focuses on specific filtration applications to help our readers to make informed decisions about zeolite manufacturing and how to handle clarifier overflow.
As always, thanks again, to our readers, for your feedback and if you missed any issues, please click on the following link:  A&SoF to view them.   Our goal this year is to further strengthen the knowledge in the marketplace and encourage conversations with the many authors, bloggers, tweeters and experts from our industry.


Barry A. Perlmutter 

Featured Problem Solving Technical Articles


Sleuthing in Solid-Liquid Separation

Scaffolding for Creativity in Business

We’ve all seen scaffolding set up to support work in the construction, maintenance, cleaning and repair of buildings, bridges, houses, and more. While these structures are rarely permanent — and are hoped to be in use only a short period of time — they must be reliable and up-to-date.

The most important scaffold, in my opinion, is creative people doing creative things. For example, creative clients have brought to BHS applications for biochemicals (using straw, wheat, bagasse, wood and plastics), fats, lipids and proteins (using chicken renderings and process water used to clean equipment in dairy operations), amino acids, inorganic chemicals and salts, final and bulk pharmaceuticals and oil & gas and refinery operations, including offshore.

At the same time, BHS has provided unique and creative process solutions in all of these cases. The idea behind scaffolding is to connect workers with their project in a safe, supported way. Creativity too will thrive in this environment — if we find ways to scaffold our creative thinkers to innovation success.

Read the Blog


FACTS At Your Fingertips:  ZEOLITES

Scott Jenkins, Department Editor, Chemical Engineering, July, 2017, page 28.

In this article, Scott Jenkins covers the basics of zeolites and their uses throughout the chemical industry.  Zeolites are hydrated aluminum silicates made up of alumina tetrahedral and silica to form complex 3-D structures with 20 – 50% void space.  These voids are exploited to control chemical reactions by absorbing reactant molecules within the zeolite pores.  There are over 45 naturally occurring zeolites and over 200 synthetic zeolites.  The International Zeolite Association ( assigns a three-letter code to each type.  Zeolites are used in catalysis operations, adsorption and separation and ion exchange.
The BHS continuous-indexing vacuum belt filter is used extensively in the manufacture of zeolites for filtration, cake washing and drying (  There are units in operation for zeolites for food, detergents, catalysts (refinery, rubber and others), automotive and other uses.  


Be Clear About Clarifiers
Amin Almasi, Rotating Equipment Consultant, Chemical Processing, July 2017, pages 25 – 29

In this article, Amin discusses the operation of clarifiers for continuous removal of bulk solids through the use of the mechanism of sedimentation as well as with the use of coagulants and flocculants.  He then continues discussing the removal devices of the sludge and the design and sizing of the clarifiers.  Finally, Amin covers the types of clarifiers including circular and rectangular tanks, tube settlers and inclined plate clarifiers.  He concludes with a case history and then summarizes that the “clarified liquids are often pumped to filters to eliminate any residual particles.” 
His summary is the perfect lead to the use of BHS candle filters (  BHS has published several articles on the use of candle filters for this application as well as troubleshooting the installation.  These can be found on the BHS website at ( In fact at the AICHE meeting in March, 2017, you can find a copy of the presentation (


American Filtration Society Fall Meeting

Challenges in Filtration & Separation

The fall meeting occurred in St. Louis on 18 – 20 September 2017.  At this meeting, Garrett Bergquist, the BHS Process & Application Engineer, presented his paper on “Continuous Vacuum Belt Filtration of Acidic Slurries (


Contact BHS at for further information or to discuss your process questions and ideas.  We are confident that we can guide you in the right direction.

C³ - Customer Contribution Corner
BHS News & Updates:

BHS Presentation, AICHE Annual Meeting, 26 – 30 March 2017, San Antonio
The BHS presentation is:  Fines Removal from Process Water

BHS Presentation, Process Development Symposium, 2 – 4 June 2017, Toronto
The BHS presentation is:  Batch Candle Filters to Continuous Vacuum Belt Filters

2017 Chem Show, 31 October – 2 November 2017, New York City
Please visit us in booth 715 and attend the BHS technology seminar. 

Guide to Solid-Liquid Filtration by Barry A. Perlmutter.
This book is part of the series of Practical Guides of Chemical Engineering published by Elsevier, Oxford, UK.

BHS New On-Site Service Contract Program.
Please contact BHS for information on our new program including spare parts discounts. 

"Lunch & Learn Filtration Seminars": BHS is organizing technical seminars focusing on the principles of filtration with application specific information. Contact BHS for details and scheduling.

BHS International Trade Shows Please Visit!

Gastech 2017, Tokyo, 4 – 7 April 2017            
Chimie Lyon 2017, Lyon, France, 20 – 21 September 2017 
Expoquimia, Barcelona, Spain, 2 – 6 October 2017