Water & Wastewater Asia Jan/Feb 2018

WATER & WASTEWATER ASIA January / February 2018 24 / FROM THE GROUND hen the question of how to reduce costs a n d i m p r o v e performance in a w a s t e w a t e r application is brought up, the answer is to use advanced instrumentation frequently. But the question remains: What kind of instrumentation should you choose to provide the best results without adding prohibitive costs? Such a query arose at Toray Fine Chemicals recently. Toray Fine Chemicals (TFC) in Chiba, Japan, is the only plant to produce dimethyl sulfoxide (DMSO) as well as polysulfide polymer in the country, using four partially buried concrete pits for the wastewater treatment process. Wastewater is discharged from each manufacturing process into the pits, which is then biologically treated and discharged to the public water area while the intermediate treatment liquid remains in the pits. As the contents are waste liquid, leakage from the underground pits can result in contamination to groundwater and soil. As its difficult to detect leakage from the bottom of the pit, it is necessary to regularly check the soundness of the pits to prevent environmental damage. Thus, With partially-buried concrete pits integral to their wastewater treatment process, continual maintenance was proving to be both time- consuming as well as costly for Toray Fine Chemicals (TFC). But the main challenge for them was not upgrading the technology they used – it was how they could achieve the best results with advanced instrumentation at efficient cost. By Nishimura Kazuo, Senior Business Development Manager, Japan, Emerson Automation Solutions