The solubility of sulfur dioxide is measured in the seawater of the Arabian Gulf, which is characterized by large seasonal variations in temperature and high salinity. A literature review shows that this is the first investigation for measuring the SO 2 solubility in the Gulf seawater. The measurements are motivated by the need for the solubility data in the design and development of efficient seawater flue gas desulfurization systems. Solubility measurements are made as a function of the seawater temperature and salinity. Water samples include distilled water, seawater, mixtures of distilled water and seawater, and brine blowdown from the multistage flash desalination plants in Kuwait. The SO 2 solubility function has a second-order dependence on the system temperature and initial salinity. Results show an increase in the SO 2 solubility and the reaction rate at higher initial salinity. Higher solubility is measured at low temperatures. Good agreement is also obtained between the measured data, literature measurements, and predictions of the solubility model.

Heavy metals are common contaminants of some industrial wastewater. They find their way to municipal wastewaters due to industrial discharges into the sewerage system or through household chemicals. The most common heavy metals found in wastewaters are lead, copper, nickel, cadmium, zinc, mercury, arsenic, and chromium. Such metals are toxic and pose serious threats to the environment and public health. In recent years, the ion exchange process has been increasingly used for the removal of heavy metals or the recovery of precious metals. It is a versatile separation process with the potential for broad applications in the water and wastewater treatment field. This article summarizes the results obtained from a laboratory study on the removal of heavy metals from municipal wastewater sludges obtained from Ardhiya plant in Kuwait. Data on heavy metal content of the wastewater and sludge samples collected from the plant are presented. The results obtained from laboratory experiments using a commercially available ion exchange resin to remove heavy metals from sludge were discussed. A technique was developed to solubilize such heavy metals from the sludge for subsequent treatment by the ion exchange process. The results showed high efficiency of extraction, almost 99.9%, of heavy metals in the concentration range bound in wastewater effluents and sludges. Selective removal of heavy metals from a contaminated wastewater/sludge combines the benefits of being economically prudent and providing the possibility of reuse/recycle of the treated wastewater effluents and sludges.

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