Paques cuts downtime using Watson-Marlow pumps at biogas plant

• Paques replaced overheating progressive cavity pumps pumps with WMFTS pumps for their highly accurate chemical dosing and ability to handle abrasive and corrosive fluids

When pumps were overheating in its biogas desulfurization system, Paques replaced them with Watson-Marlow Fluid Technology Solutions (WMFTS) peristaltic pumps and has since experienced increased efficiency and cost savings.

Paques, a world leader in the development and construction of cost-effective purification systems for wastewater and gases, has reduced downtime by deploying APEX, Qdos and Bredel pumps in an anaerobic industrial effluent treatment system in Brazil.

Challenge

Paques, which has headquarters in The Netherlands, helps companies to reduce fresh water intake, decrease their carbon footprints and reclaim valuable resources from waste through its environmentally-friendly biotechnology. 
 
Paques’ biological process THIOPAQ^®, removes hydrogen sulphide (H₂S) from biogas and natural gas streams that produce elemental sulfur, a yellow solid at room temperature, and can be applied to a wide range of biogas streams containing H₂S.

Progressive cavity pumps were prone to overheating during operation, especially during the transfer of sulfur mass from reactors to the centrifuge, and required constant temperature monitoring which led to frequent maintenance downtimes.

It was during the production of a new client unit that Paques made improvements to its THIOPAQ^® biogas desulfurization system THIOPAQ^® - Biogas Desulfurization - PAQUES. The unit was a joint venture between a large sugar mill and a co-generating energy company focused on the production of biogas from agricultural waste.

Solution

In this project, the progressive cavity pumps in the THIOPAQ^® system were replaced with several different peristaltic pumps from the WMFTS – APEX and Bredel hose pumps and Qdos chemical metering pumps - which reduced downtime and maintenance.

“Compared to the previous progressive cavity pumps used in the THIOPAQ^® system, the WMFTS peristaltic pumps offer a much lower total cost of ownership,” said Antonio Yamada, Engineering Manager at Paques. “In addition, expenses related to maintenance have been significantly reduced, as well as the volume of chemical components that need to be used in the process.”

The pumps run all day, every day and are used in the chemical dosage of nutrients, soda and defoamer in the fluids coming from the waste ponds, and in the transfer of the sulfur mass to the centrifuge. The Qdos pumps are used for chemical dosing; the APEX and Bredel are used for sulfur transfer and soda dosing.

“Compared to the previous progressive cavity pumps used in the THIOPAQ^® system, the WMFTS peristaltic pumps offer a much lower total cost of ownership.”

Antonio Yamada, Engineering Manager at Paques

Results

Accurate chemical dosing of the APEX and Qdos pumps improved quality and efficiency in the H₂S removal process. In addition, Bredel pumps’ ability to handle highly abrasive and corrosive sulfur mass removed the need for continuous, costly interruptions for corrective maintenance and so has contributed to increased efficient operation.

“The partnership between WMFTS and Paques has been key in the success of the plant project,” explained Nilton Constantino, Sales Engineer at Watson-Marlow.

“It’s a perfect demonstration of how taking the time to correctly identify problems in the day-to-day system operation, as well as other valuable information about the system, allows the creation of a solution that perfectly fits the customer’s needs. Watson-Marlow’s unique position as a full-service provider means we have expertise across a wide range of pumps and equipment, and can recommend the optimal solution for our customers, whether that is a single pump type, or multiple pumps from our range.”

The plant was launched at the end of 2020 next to an existing ethanol and sugar mill of a multinational company, which grinds more than 5 million tonnes of cane per year, and generates a volume of vinasse - a byproduct of the sugar or ethanol industry - capable of meeting biogas needs on a commercial scale.

With the expectation of producing 138,000 megawatt hours (MWh) of electricity a year, the project places this consortium in a strategic position in the renewable energy market, and highlights the great potential that exists in the treatment of agro-industrial waste for a rapidly expanding market.