Press Releases

Kurita Water Industries Ltd. (Head Office: Nakano-ku, Tokyo; President: Michiya Kadota) is pleased to announce the start of application of the S.sensing^®RS water treatment management service using IT and sensing technologies for sewage water treatment facilities. The S.sensing^®RS system predicts the generation of hydrogen sulfide as an odorous component to automatically control the optimal injection amount of deodorant. It manages the odor risk at sewage water treatment facilities and controls odor generation to provide customers with safety and labor savings.

Hydrogen sulfide generated from sewage sludge is a major odorous substance that causes complaints from neighboring inhabitants and health hazards of workers. In order to solve the problems, deodorizing agents are applied in many facilities.
Conventionally, hydrogen sulfide concentration and the deodorizing effect are measured manually with detector tubes, therefore it is difficult to monitor continuously. Injection rate of deodorant is adjusted manually according to the measured hydrogen sulfide concentration. However, in the case that hydrogen sulfide generation fluctuates, determination of the injection rate becomes difficult because deodorization effect has a time lag until the deodorant injection takes effect. Thus, an issue remained with the stable maintenance and management of sewage water treatment facilities.

Responding to this issue, Kurita developed the S.sensing^®RS system as a version of the S.sensing^®(*) water treatment management system utilizing IT and sensing technologies, and began introducing it to facilities. With the self-feeding measuring instrument installed outside the sludge tank, the S.sensing^®RS conducts real-time monitoring of hydrogen sulfide generation in the sludge tank and the deodorization effect to automatically control the optimal injection volume of deodorant. Focusing on the fact that hydrogen sulfide is produced from the activities of microorganisms, or anaerobic bacteria, in sewage water sludge, Kurita has built a system that measures the properties of sludge to monitor the state of their activities and predict hydrogen sulfide generation, enabling optimal control of the amount of deodorant to be added. It predicts the generation of odor caused by hydrogen sulfide and the deodorization effect and helps maintain a safe working environment. Since customers are able to check the deodorization effect on the monitoring screen, the system provides a sense of safety in facility management and reduces the on-site workload, leading to labor saving.

The S.sensing^®RS system is already being used at five sewage water treatment facilities. Kurita is planning to increase the number of facilities using the system to 100. Kurita boasts a broad array of proprietary deodorizing agents in the SKURITA DO Series to deal with sewage water sludge and dyhydrated cake, which it combines with a proven track record in this domain. The company possesses outstanding expertise in addressing odor risks at various ranging from sewage water channels to sewage water treatment facilities. Going forward, Kurita will combine the S.sensing^® technology with water treatment chemicals such as KURITA WB Series chemicals, which inhibit sludge from going rotten to prevent deficiencies in condensation in gravitation enrichment tanks, aiming to offer sewage water treatment facilities solutions for stable operation, failure prevention and labor saving in operation management.

(*)S.sensing^®：

A water treatment management service using a system that bundles measurement, analysis, control and monitoring functions to monitor water quality and chemical injection volume on a real-time basis in a facility where water treatment chemicals are used and to enable optimal chemical injection control according to changes in water quality.