Waste Water References

E.coli

Sewage treatment monitoring and controlled disinfection at one of the world’s largest waste water treatment plants.

official statement from DSD as follows:

DSD and ARUP present an innovative project at Hong Kong´s Stonecutters Island Treatment Works (SCISTW).

As an attempt to adopt new technology in order to improve efficiency and efficacy of sewage treatment, DSD and ARUP are trialing VWMs’ ColiMinder technology at HK Stonecutters Island.

The treatment works at Stonecutters Island consists of Chemically Enhanced Primary Treatment (CEPT) and disinfection with Sodium Hypochlorite. The SCISTW services a population of more than 5 Million and with a design ADWF of 2,450,000 m3/d is it one of the world’s largest CEPT wastewater treatment plants.

Sodium Hypochlorite for disinfection consists as one of the significant operating costs. A number of inherent technical issues, including variable wastewater chlorine demand and fluctuating environmental conditions provide a challenge for the operators to optimize the chemical consumption while meeting disinfection objectives.

The goal of DSD and ARUP is to:

• Improve process efficiency
• Safeguard water quality

The trial has been under way since December 2017 and so far over 5,000 measurements have been recorded without failure or need for re-calibration of the unit. While the trial period is planned for 12 months in order to cover all expected process conditions, initial performance indicates that the equipment is reliable and the relationship between ColiMinder and Laboratory results is positive.