A Bangkok-based confectionary plant recently upgraded its wastewater treatment plant using advanced anaerobic technology from Global Water Engineering (GWE).
Food and beverage companies around the world are increasingly under pressure to minimise their physical and environmental footprints in rapidly growing cities, especially in the Asia-Pacific and Australasia where space is at a premium, clean water supply is scarce and global warming is a major issue.
GWE’s advanced anaerobic technology has been implemented at the Thai confectionary plant to meet and exceed environmental objectives within Bangkok, one of the toughest municipal regulatory regimes in Asia. The Thai capital is on a drive to combat global warming generated by its fast growing population of more than eight million people.
Part of an international chain, the confectionary plant recently upgraded its wastewater and renewable energy plants in line with the city’s Action Plan on Global Warming Mitigation 2007-2012, using advanced anaerobic technology from Global Water Engineering that cuts the Chemical Oxygen Demand (COD) from discharge water by more than 90%.
The new Bangkok process water treatment plant occupies only 50-60m² and integrates seamlessly into the plant’s existing facility to not only lift output standards beyond specification, but also to produce 1,800m³ of biogas a day at nominal load.
According to GWE CEO Mr Jean Pierre Ombregt, the wastewater treatment plant is exceeding the 90% COD removal specification in service and frequently achieves 95%. The plant also consumes less energy than before.
The Bangkok wastewater treatment plant consists of pre-treatment, anaerobic stages and the previously existing aerobic stage. The pre-treatment stage includes a pre-existing equalisation basic and degasifying basic. Prior to entering the anaerobic reactor (UASB), the pH is adjusted by the addition of NaOH inline, followed by an inline mixer.
The confectionary plant’s wastewater passes through several pre-treatment steps before entering a GWE methane reactor in which the wastewater’s COD is digested by bacteria in a closed reactor, degrading the compounds and converting them into valuable biogas and cleaned effluent.
Biogas from the process is collected and reused as renewable energy to power the plant’s boiler drying equipment.
The plant delivers biogas at 70% methane content to power boilers and heat processes, replacing the consumption of expensive and polluting bunker oil. The processed wastewater is very clean with no smell.
Mr Ombregt, whose company has installed over 300 water and wastewater treatment plants in more than 60 countries across Asia, Africa, North and South America, Australia, China, Europe and Russia, says that the Bangkok confectionary plant installation is a great example of how top environmental standards of wastewater cleanliness can be achieved while generating green power on compact sites.
GWE has successfully built and commissioned more than 75 biogas utilisation systems for clients worldwide over the past 15 years.
GWE clients include companies such as Budweiser, Chang, Carlsberg, Coca Cola, Corn Products Int’l, Danone, Fosters, Heineken, Interbrew, Kraft, National Starch & Chemicals, Nestlé, Pepsi Cola, SAB-Miller, San Miguel, Singha, Sunkist and Tsingtao among others.
Global Water Engineering specialises in industrial wastewater systems and renewable energy solutions.
GWE partner CST Wastewater Solutions has implemented the same technology in Australian food and beverage plants for clients including Golden Circle and SAB Miller’s Bluetongue brewery.