Study on Improvement of Typical Chemicals Tank Washing Water Treatment Based on Catalytic Technology in the Yangtze River

The liquid bulk cargo throughput of inland ports in the Yangtze River system reaches 230 million tons, and there are more than 250 types of dangerous chemicals in waterway transportation. The tank washing operation of bulk liquid chemical ships due to cargo exchange and other reasons would produce tank washing water containing liquid bulk cargo residues. In 2017, the tank washing water of the Yangtze River trunk line reached about 1.15 million tons. The process of tank washing water treatment is complex and the cost is high correspondingly. Most of the received tank washing water is sent to the wastewater treatment plant for treatment. The existing treatment processes for wastewater in the ports can effectively degrade chemical oxygen demand, but some characteristic pollution factors such as benzene series have poor biochemical degradation effect and difficult to meet the discharge requirements. In this study, typical chemicals in the Yangtze River waters are selected to carry out experimental research on the treatment effect of photocatalytic technology to chemical tank washing water. The results show that the treatment efficiency of chemical tank washing water can be significantly improved by modifying the traditional photocatalytic materials. Combined with the traditional wastewater treatment process, the discharge of chemical tank washing water can meet the standard.