The main objectives to be achieved with this project to improve and reform the Castellón WWTP, in order of priority, are:
- Minimize the number of unit processes involved in the water and sludge line. This implies a change in the type of treatment, i.e. a change from a conventional activated sludge process to a prolonged aeration process, where the sludge is highly stabilized and the sludge line is greatly simplified.
- Expansion of the treatment flow from the current 45,000 m3/day to 60,000 m3/day (300,000 inhab-eq). To this end, and given the limited space, a new membrane bioreactor (MBR) treatment line will be designed.
- Arrangement of a Regulation Tank to treat the flow tips. It is intended that the plant works at a constant flow, achieving a more stable process and simplifying exploitation tasks.
- Optimization and reform of the facilities of the water treatment plant of Castellón, to improve the quality of the treated water, allowing it to be reused for irrigation.
- Minimise the environmental impact of the facilities, both inside and around their location, with particular emphasis on the issue of deodorisation.
The works that are projected are:
- Two new piston-flow biological reactors of 20,382 m3 and 20,460 m3 each, as well as connection to existing facilities.
The MBR line consists of:
- New Pretreatment: Two (2) grinding/screening channels equipped with two (2) rototamines. Two lines of desanding-degreasing. Extraction-classification of sands and concentration of fats
- New Regulatory Tank of 8,000 m3 and pumping feed to MBR reactors
- New membrane biological reactors (MBR), 4 units, with a unit flow rate of 9,000 m3/day.
- Two UV disinfection lines in channel and chlorination tank
- Two (2) flotation thickeners
Includes: electrical installations; control and instrumentation; auxiliary services; deodorization system; various buildings for equipment accommodation, control, changing rooms and workshop.