Sludge accumulation at pools and reservoirs’ bottom beds is a known and familiar issue encountered in diverse Wastewater and Sewage Treatment Facilities. Excess sludge that wasn’t discarded by the treatment processes sinks down and creates operation and maintenance problems as well as actual damage to the quality of the treated waste water emanating from the Wastewater and Sewage Treatment Facility. In many cases, the tertiary treatment of the treated waste water is impossible due to the clogging of the sand filters as a result of the sludge sliding into the treated waste water. The sludge’s evacuation will allow to revert the situation while improving the water qualities and decreasing the running costs.
Cleaning the pools by pumping the sludge sunken at the bottom bed and dewatering it in order to reduce the volume of the sludge designated for evacuation. The pool’s cleaning process will be executed by combining the two technologies that were offered:
Sludge dredging by a marine DREDGER.
Sludge dewatering be means of Geotube®.
Two years earlier, a similar project was carried out and it included sludge dewatering using Geotubes.
Since the volume of the existing Geotubes has been reduced consequent upon the dewatering process, it was decided to use them again and discharge an additional amount of sludge.
It was agreed that if after refilling the existing Geotubes sludge will still remain in the reservoir, additional Geotubes will be supplied and placed as a second floor above the existing Geotubes in order to complete the work.
The utilization of Geotubes that have been erected previously prevents the need for new procurement while significantly reducing the project’s costs.