At the end of April, Royal HaskoningDHV and Anglian Water announced a cooperation agreement for the HpH digestion technology, in order to establish its presence in the wider UK and international sludge treatment market. Marketed under the name Helea, the biological hydrolysis and pasteurisation technology augments Royal HaskoningDHV's existing portfolio of sludge treatment solutions and aims to challenge Cambi's dominance in the hydrolysis market. Helea was initially developed in-house by Anglian Water as an integral part of its advanced anaerobic digestion-focused bioresources plans, with the seeds first sown as early as 2005. The process sees sludge preheated, before moving into the pasteurisation stage where it is heated to a minimum of 55° Celsius and held for around five hours. Finally, it is moved to the hydrolysis tank where it is then retained for approximately two days at a temperature of 40° Celsius. The retention time is operator-adjustable to maintain and optimise the right conditions for digestion.
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