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Water Recovery and Green Energy Technology from CST Wastewater Solutions Powers Thai Primary Producer

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article image Chokyuenyong Industrial plant overview

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CST Wastewater Solutions  has provided their technological expertise to a Thailand-based primary producer, helping it to transform waste into green energy while reducing pollution levels.  

Clean water and green energy technology by CST Wastewater Solutions has been used to reduce pollution, save power and enhance profitability at the same time.  

Chokyuenyong Industrial, a cassava producer based in Thailand has implemented the technology package from Global Water Engineering to cut effluent COD (Chemical Oxygen Demand) pollution levels at its cassava production plant by more than 95 per cent.  

Using the technology, the plant is able to extract gas from its wastewater to power its boilers and generate electricity for its own use while selling the excess back to the provincial grid.  

Designed as a model for food and beverage plants globally, the system is based on the installation by CST Wastewater Solutions and Global Water Engineering (GWE) of a state-of-the-art water recovery plant and green energy plant at the $120-million Bluetongue Brewery on NSW’s Central Coast.    

According to CST Wastewater Solutions Managing Director Mr Michael Bambridge, the latest installation shows what can be achieved by primary producers such as vegetable, starch, dairy and meat producers when this technology is adopted by them to deal with their waste and by-products.    

Processing 1200 tonnes of cassava roots a day, Chokyuenyong Industrial uses GWE anaerobic technology with a capacity to process 3,200m³ of effluent a day to achieve top environmental standards of wastewater cleanliness while generating green power and carbon credits as well, says GWE CEO Mr Jean Pierre Ombregt.    

GWE has completed more than 300 water and wastewater projects in over 60 countries across Asia, Africa, North and South America, Australia, China, Europe (including Eastern Europe) and Russia.    

GWE has successfully built and commissioned more than 75 biogas utilisation systems for clients worldwide.    

Key benefits derived by Chokyuenyong Industrial from the installation: 

  • Cut COD pollution level of influent wastewater from 22,500mg/l to less than 1125mg/l, resulting in cleaner discharges to treatment ponds
  • Returns up to 2.7 Mw of electricity a year to a provincial power grid, PEA
  • Saves the equivalent of up to 21,000 litres a day of fuel oil by producing up to 34,000 Nm³ of biogas
  • Biogas is used to power boilers and heating equipment used extensively in cassava drying and processing as well as for the large numbers of rotating equipment used in processing
  • Generates carbon credits under the UN Framework Convention on Climate Change, through which it earns valuable internationally tradable CER certificates

Chokyuenyong’s installation comprises of an equalisation basin (total volume 1600m³) with submerged agitators, degasifying basin with agitator (24m³), in-line pH adjustment, NaOH storage tank (25m³), UASB methane reactor (active volume 4800m³) and biogas flare. 

The technology has been installed and commissioned above-ground for simplicity and ease of maintenance.    

GWE’s state-of-the-art anaerobic treatment system significantly reduces the plant’s carbon footprint by preventing the release of methane gas into the atmosphere.    

The wastewater passes through several pre-treatment steps before entering a GWE methane reactor in which the wastewater’s organic content (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 fuel in the plant’s thermal oil boiler, saving money that would otherwise be spent on bunker oil, which is subject to wide fluctuations in price.    

Chokyuenyong’s excess biogas is used in electrical power generation.    

Chokyuenyong Industrial President Tawatchai Yuenyong says that the investment in the anaerobic treatment technology has been well justified by the outcome in terms of environmental and financial results.    

Not only does the plant have a highly efficient wastewater system that complies with Thailand’s strict environmental standards, but it will also continue to repay investment over many years ahead.    

Results achieved at Chokyuenyong can be even further improved by converting its solid wastes from production into biogas using GWE’s RAPTOR treatment system for solid organic residues.    

The RAPTOR technology or Rapid Transformation of Organic Residues is a powerful liquid-state anaerobic digestion process that consists of enhanced pre-treatment followed by multi-step biological fermentation to optimise conversion of almost any organic residue or energy crop into biogas, valuable electricity or heat.    

GWE is a market leader in anaerobic industrial wastewater treatment systems with more than 300 installations in 60 countries.    

Specialising in industrial wastewater solutions and renewable energy solutions, GWE offers a wide range of technologies for water recycling, digestion of biomass, sludge and slurries, biogas production and reuse, bio-energy as well as carbon credits.

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