MANAGEMENT OF TOXICS FOR THE FUKASHIBA INDUSTRIAL WASTE-WATER TREATMENT-PLANT OF THE KASHIMA-PETROCHEMICAL-COMPLEX

The Kashima petrochemical complex and its Fukashiba industrial wastewater treatment plant are described. When the factories of the complex discharge the wastewater, they must be in compliance with the standards designated in the Sewage Law of Japan, because they are users of the public sewage system. Ten of 81 factories discharged the wastewater containing identified toxics, and they treated corresponding toxic iterns before discharging to sewers. The wastewater of the factories was constantly monitored by the office of Kashima sewage works, and there had been few troubles with the operation of Fukashiba treatment plant. However, sludge contained cadmium at relatively high concentration in Fukashiba treatment plant, compared with sludge of the domestic sewage treatment plants. The sources of Cd were possibly the use of large amount of slaked lime in these factories. Prior to the construction of any new manufacturing plant, the office of Kashima sewage works practiced the test of biodegradability and toxicity of potential wastewater from the plant. The analytical method of GC/MS became a useful tool to confirm biodegradability and toxicity of substances in the wastewater from each plant.