Cambi AS was awarded a contract to build its thermal hydrolysis process (THP) for an innovative digestion project at Aguas Andinas’ wastewater treatment plant Mapocho. The plant treats wastewater from the city of Santiago in Chile. The contract was awarded by a joint venture between Degremont and AGBAR, as a part of their 260 million Euro contract for a major upgrade and capacity increase project at the Mapocho wastewater plant.
Cambi THP will be a vital component in the efficient production of biogas from the sewage sludge that will be used to produce approx. 60% of the electricity needed to operate the entire wastewater treatment plant. The implementation of Cambi THP facilitates the overall goals of the total project in accordance with the Region of Santiago’s sustainable development policy. The policy aims to restore the natural environment’s water quality and to prepare the region for
a population increase. The project involving Cambi THP will double the capacity of the waste- water plant and enable the treatment of a wastewater quantity equivalent to 4 million inhabitants.
The project represents a Latin American breakthrough for Cambi’s state-of-the-art Norwegian technology. Cambi has won 25 major projects with this technology primarily in European countries. Cambi’s global presence however is growing.
At Mapocho, a high and substantially increased load of secondary sludge will be treated by Cambi THP and then mixed with raw primary sludge prior to digestion. Due to the pre- treatment with Cambi THP the client will be able to feed the digesters at a significantly higher load and with lower retention time than with conventional digestion. In addition, the process will
yield a high-quality cake fertilizer product.
Cambi THP has a major effect on secondary biological sludge, which is generally very difficult to digest and dewater. The Cambi process has already proven its ability to significantly improve the digestibility and dewaterability of secondary sludge in large-scale projects including Brisbane and Brussels, where traditional digestion processes were unfeasible.