case: duqm, oman
The Government of Oman has decided to build a world class port in Duqm, centrally located on the shores of Oman facing the Arabian Sea. One ofthe pillars ofthe investment is a dry docking facility run by the Oman Dry Dock Company (CDC) in cooperation with Daewoo Shipbuilding St Marine Engineering. In the dry-dock vessels, especially tankers. are dry-docked for regular maintenance and emergency repairs. When these tankers are repaired the vessel needs to be cleared of all \ fuel residues, oils, sludge's and tanks should also be thoroughly cleaned creating massive amounts of polluted waters. ODC was looking for the best partner to supply a state of the art slops and sludge processing plant that was able to achieve the most efficient and effective results. and most ofall be as environmental friendly as possible.
Main requirements are:
- To design and build a MARPOL Grade Port Reception Facility
- To meet the high standards ofdischarge set by the Oman Government in order to protect the unique and sensitive local natural environment
- To recover the maximum possible oil content in the waste in order to recycle
- Capable oftreating up to 30 m3/hour of Slops (Oil in water waste) and 3 m3/hour of Sludge (Solid waste collected from the bottom of ships tanks)
- Total capacity of 400.000 m3 of liquid wastes per year
- To build a facility in accordance to IMO, API. BSI, ANSI, ASME and local Omani regulations
The request of the customer was to build world's biggest maritime waste processing plant h h in a remote location under harsh conditions: temperatures up to 50 C, strong winds and t e c a high salinity levels. The construction process was also logistically a challenge. The operations are even a bigger one. Because of its remoteness the plant should have robust processes and equipment in order to prevent downtime and waiting on essential parts. therefore Nature designed and implemented proven processes that are able to deliver quality and durability: all Within the window ofthe environmental friendly philosophy of the Omani Government.
Nature Group design for the Oman Dry Dock company is a classic 3-way separation system that is easy to use and delivers the best results possible. The maritime waste water three stage process train has a treatment capacity of nominally 30m3/hr. The Ist stage is gravity separation in the reception tanks followed by further gravity separation in the CPI unit continuing to 2nd Stage Floatation utilizing a DAF unit and the 3rd / final stage is bioremediation using an aerobic fixed film biological reactor. The plant receives oily water (influent) from the several storage tanks and treats the wastewater to meet the discharge consent parameters to enable final discharge of the treated water (effluent) to the sea. Any sludge's are cleaned and dewatered with the help ofshakers and decanters after which the oil is recovered. water is treated in the water treatment process and the thick sludge is nature transferred for incineration or bioremediation. The plant consists of several collection tanks for the collection and storage of different waste types. buffer storage and recovered oil. Next to the tanking there is the water and sludge treatment area. support buildings including laboratories.