Colour and odour removal


Process liquids in the chemical, pharmaceutical and food sectors must be kept free from substances such as additives, dyes and precipitants to ensure smooth production and high value products. DESOTEC provides simple activated carbon solutions to firms seeking to remove unwanted molecules from their process streams and side streams.

Purifying valuable product streams of unwanted colours and odours

In the pharmaceutical, chemical or food sectors, product purity is of the utmost importance. Before the precipitation process, liquids may contain traces of dissolved substances that will add unwanted colours or odours to the finished product. For example: amino acids used in food production could contain organic nitrogen, detected as colour; plastic recycling monomers might contain dyes or additives; bioethanol could include odorous aldehydes or amine compounds; while specialty chemicals such as de-icers could bear traces of colour from organic compounds or trace metals.  

DESOTEC’s sustainable activated carbon filtration solutions are purifying liquid chemicals such as acids, mineral oils, brines and solvents. In urgent situations, e.g. where a problem has arisen in one batch of product, our mobile filters may be installed rapidly on a temporary basis to quickly solve the issue.  

Valorising by-products through colour and odour removal

Activated carbon filtration may also be used to clean up liquid by-products so they can be sold or re-used. The manufacture of chlorine, for example, creates HCI as a by-product, which is often reused as a chemical reagent. After purification, this HCI may be sold to the food industry at a higher price. Likewise, the manufacture of chemical intermediates may result in a by-product of phosphorous acid (H₃PO₃). By removing traces of organic matter detected as colour, this phosphorous acid may be reused or sold for a range of industrial applications. This not only creates a new market, but also saves on disposal costs and boosts sustainability.  

Purification of product liquids to improve production processes

Impurities in process streams may hamper further stages of production. The removal of traces of organic agents, toxic or foaming compounds and other substances may be necessary to boost crystallisation or fermentation, and reduce losses. By enhancing production processes, companies may boost their sustainability and their bottom line. DESOTEC’s activated carbon filters are supplied on a rental basis, so require no upfront investment. They are suitable for intermittent flows, and may be used as and when needed. Furthermore, safe and sustainable filtration waste handling is part of our full-service solution.

By removing colours and odours from process liquids, companies may achieve higher product purity standards, valorise by-products, and boost profits. DESOTEC is here to help, with simple and sustainable mobile filtration solutions to purify process streams.

Helping you comply

For food and feed applications, e.g. amino acid production, companies must abide by the appropriate regulations concerning food safety. Alternatively, companies may need to meet specific quality standards set by their end-clients. In-house production efficiency targets may also be relevant. In all cases, DESOTEC is the partner you can trust: our activated carbon filtration systems are capable of reducing impurities to below detectable levels, enabling you to meet the terms of your operating licence or contract.

How we help you

DESOTEC’s mobile activated carbon filtration solutions

Activated carbon, in either powdered (PAC) or granulated (GAC) form, is a simple yet effective purification method for process liquids. PAC has a higher consumption rate and cannot be reactivated, thus creating further waste. So at DESOTEC, we focus on using GAC in our mobile filters. This plug-and-play rental technology is ideal for intermittent usage. Our mobile filters are swift and easy to install and exchange. The system is modular, so filters may be added or removed as requirements change. We handle all filtration waste, destroying the adsorbed molecules in our furnaces. It’s usually possible to reactivate the carbon, cutting customers’ costs and boosting sustainability.  

For our new plant, we needed a reliable water purification process. DESOTEC helped us set up the best possible installation, given the complexity of our process. We are very pleased with the result.

Our filtration solutions

Flexible, mobile and modular solutions with sustainable waste handling and 24/7 support. With DESOTEC by your side, it’s easy to go green.

Our filtration solutions