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Category: Filter

Several Types of Clarifying Filtration

Rifka Aisyah

In previous post, I shared several types of filtration methods and more about cake filters. In this post, I want to share to you several types of clarifying filtration.

Read also: Introduction to Filtration

Read also: Many Types of Cake Filters

The main objective of clarifying filters is to remove small amounts of solids or liquid droplets from either liquids or gases. The liquid may be drinking water, wine, beer, oil, etc., and it is usually the liquid which is the valuable product.

In clarifying filters, the particles are trapped inside the filter medium or on its surfaces. Surface forces catch the particles and immobilize them on the surfaces or within the flow channels.

In general, clarifying filtration are categorized into liquid clarification and gas cleaning. Read More

A Simple calculation on How to Determine Time Required to Obtain Certain Volume of Filtrate

Rifka Aisyah 1 Comment

In this post, I want to share how to do a simple calculation on determination of time required to obtain certain amount of filtrate in a filtration test. We will still use basic equation as in previous post.

Read previous post: How to Determine Cake Resistance in Filtration Systems

For example, we have this case.

A filter press with a surface of 50 m2

C (weight of solid per volume of liquid) = 135 kg solid/m3 liquid

μ = 0.001 N sec/m2

α (specific resistance of the cake) = 1.1 (1011) m/kg

Rf (resistance of filter cloth) = 6.5 (1010) m-1 Read More

How to Determine Cake Resistance in Filtration Systems

Rifka Aisyah 2 Comments

Purpose of this post is to determine cake resistance in filtration systems, as a function of operating pressure of filter. Before we jump into the calculation, let us learn first several basic calculation in filtration system.

As filtration proceeds, a porous cake of solid particles is built up on a porous medium, usually a supported cloth. The flow of liquid is laminar because of the fineness of the pores. Therefore, the following equation represented the phenomena:

Q = \frac{{dV}}{{dt}} = \frac{{A\Delta P}}{{\mu R}}

The resistance R is made up of filter cloth Rf and that of cake Rc which may be assumed proportional to the weight of the cake. Read More

Introduction to Filtration

Rifka Aisyah 2 Comments

These days, I feel like learning topics related to solid processing. After I learned about agitation process and its scale-up, I want to learn about filtration process.

So, in this post I want to share you general preview of filtration process. Honestly in my career until now, I already handled one project related to filtration equipment, which is my very first project: pre-feasibility study of carboxymethyl cellulose plant. The filtration equipment used in the project was rotary vacuum filter.

I hope by learning and writing what I read here in this blog will refresh my knowledge and hopefully useful in the future projects. Read More

Vacuum Belt Filter: Get to Know

Rifka Aisyah Leave a comment

Today (4/30), I asked my Boss if he wanted to join us to have site visit to Dawuan, Cikampek. One of our upcoming project will be Bankable Feasibility Study of Carboxymethyl Cellulose Plant. He told me that he basically liked travelling. I sensed something positive would be coming. However, he asked me to find a lot of information about Vacuum Belt Filter, to list the information required to design vacuum belt filter, and to find technical drawings of vacuum belt filter. It was a bit hard job to do. But, I feel a lot of fun. Read More