Estate Service Asset - PDO

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Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update standards (Standard A-2) for land irrigation (refer Table 2.7 in Chapter 2). To control the treatment processes and establish conformance to discharge standards, estate services maintain a daily and weekly monitoring regime. The daily monitoring program is carried out by plant operating staff (contractor staff) and the parameters monitored daily are pH, chlorine, sludge volume index and dissolved oxygen. The weekly monitoring is carried out by PDO’s Production Chemistry Laboratory staff in MAF and includes total suspended solids, BOD, COD, ammoniacal nitrogen and faecal coliforms. The characteristics of the treated effluent from both the STPs as monitored during the year 2002 are summarised below: Table 4.1: Treated Sewage Characteristics Parameter Units MAF-STP RAH-STP Volume of sewage m 3 /d ~500 (Estimated) ~500 (Estimated) pH None 7.8-8.4 (XN=0/41) 7.6-8.3 (XN=0/41) Total suspended solids mg/L 0.4-13.2 (XN=0/41) 1-7.2 (XN=0/41) Ammoniacal nitrogen mg/L 0.1->10 (XN=13/41) 0.1->10 (XN=1/41) Biological oxygen demand mg/L 7-17 (XN=0/41) 7-13 (XN=0/41) Chemical oxygen demand mg/L 10-170 (XN=0/41) 12-83 (XN=0/41) Free chlorine mg/L 0-5 (XN=33/41) 0-5 (XN=24/41) Notes: XN = Number times regulatory standards exceeded per total number of times monitored. As per the STP operating manual, free chlorine in the treated effluent shall be maintained within 0.5-1.5 mg/L. From the above values in table 4.1, it is observed that the number of exceedance per total number of times monitored is high for ammoniacal nitrogen and free chlorine. On the other hand, some critical parameters are not monitored such as heavy metals, phenols, sodium absorption ratios, etc. The recommendations and additional mitigation measures are presented in chapter 7 of this report. 4.4 Solid Wastes 4.4.1 Sources of Generation In PDO, the solid wastes are classified into broad categories as non-hazardous and hazardous. The sub-groups in each category are as below: ©HMR Environmental Engineering Consultants C4 - 6 Oman’s Environmental Consultancy HMR\1501\Estate Services
Petroleum Development Oman Estate Services Asset Environmental Assessment 2002 Review and Update Non-hazardous wastes: domestic and office waste; water based drilling mud and cuttings; non-hazardous industrial waste Hazardous wastes: oil based mud and cuttings; sewage sludge; waste lubricants; oily sludges; oily sand; pigging sludge; non-recyclable batteries; recyclable hazardous batteries; transformers and transformer cooling fluids; clinical wastes; NORM wastes; chemical wastes (including miscellaneous hazardous wastes) Four types of solid wastes are routinely generated within the areas serviced by estate services. These are domestic wastes, office wastes, clinical wastes and STP sludge. Domestic wastes are generated from housing units and restaurants. They include wet kitchen wastes, non-recyclable and non-hazardous solid wastes and recyclable nonhazardous wastes. Office wastes are generated from the various administrative buildings and include both recyclable and non-recyclable wastes. Clinical wastes are generated from all the PDO clinics in the interior locations and in MAF area. On incineration, clinical waste generates a small quantity of ash. STP sludge is generated from the two STPs located in MAF and RAH areas. Apart from clinical wastes, no hazardous waste is normally generated in the areas serviced by estate services. However, hazardous waste such as waste batteries, waste transformer oils, waste lubricating oils, waste oil sludges and contaminated soils may be generated occasionally. Other hazardous wastes including discarded tyres, discarded containers of hazardous materials (i.e. paints, insecticides, pesticides and other hazardous chemicals) are also generated intermittently by the contractors. These wastes are disposed directly by the contractors. 4.4.2 Waste Management On behalf of estate services, approved contractors collect, segregate, dispose and recycle the various solid wastes generated from MAF and RAH areas. The estate services staff supervise the contractor staff and ensure the compliance with PDO’s waste management specification (SP-1009). The wet kitchen wastes and other non-recyclable wastes and non-hazardous wastes are collected in black plastic bags and then sent directly to the Muscat municipal landfill site for disposal. The recyclable non-hazardous wastes are collected in yellow bags and sent to PDO’s waste processing plant in MAF, which is operated and maintained by a private contractor. Here, the dry waste is manually segregated into several categories such as paper, plastic, glass, metal and wood. The segregated dry waste is then sent to waste dealers for recycling. ©HMR Environmental Engineering Consultants C4 - 7 Oman’s Environmental Consultancy HMR\1501\Estate Services
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Estate Service Asset - PDO

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