SMART WATER CITIES: IN BEIJING THE PIPE::SCAN ENABLES REAL-TIME MONITORING OF THE DRINKING WATER
To measure turbidity, color, free/total chlorine, pH, conductivity and other conventional and key indicators at the same time, the Beijing Waterworks Group Co., Ltd. installed a pipe::scan in the drinking water network. The Group has been relying on s::can products since 2017. At that time 50 i::scans were installed for turbidity real-time monitoring.
Background
Beijing Waterworks Group Co., Ltd. is one of the most infl uential urban water supply enterprises in China. The group is responsible for the water supply of central Beijing, Tongzhou, Huairou, Miyun, Yanqing, Fangshan, Daxin, Mentougou and other new suburban areas. By the end of 2019 they supplied 4.85 million m³ every day. The total length of the pipe network is more than 14,000km and the service area includes nearly 1,180 km² with more than 5.3 million households.
Challenge
Beijing’s water supply sources include local and external sources. More than 20 water sources are used, which is very rare. This represents the complexity and diversity of the water quality in Beijing. The aging urban network threatens the water quality and is therefore a potential source of danger. An automatic water quality monitoring equipment has to be installed in the pipe network, to ensure water supply safety in the capital. The installation space of the test site is small and the pipeline, made of cast iron, is aging, which might affect the reading of turbidity. The duration of the maintenance intervals and certain settings of the pipe::scan needed fi ne tuning. In addition, laboratory validation is required to determine whether the pipe::scan transfers the water quality data correctly to the SCADA.
s::can’s solution
For the parameters like turbidity, free/total chlorine, pH and conductivity, the system was equipped with s::can sensors, automatic brush cleaning and the con::cube terminal. For the aged pipe, a double layer fi lter was added, to make sure that iron particles do not interfere with measurement results. SCADA get the data via the RS485/Modbus protocol from the terminal con::cube.
The pipe::scan is an innovative, modular sensor system for monitoring drinking water quality in pipes under pressure. It is ACS drinking water certifi ed and measures up to 10 key parameters in one device:
IET SEPTEMBER/OCTOBER 2021
WWW.ENVIROTECH-ONLINE.COM The functional principle of the pipe::scan
A local contamination event detection software with real-time alarms, tested by US-EPA, allows a real- time detection of events, so that immediate countermeasures can be taken to prevent harmful events on the consumers.
The pipe::scan has been ACS drinking water certifi ed by the independent French institute CARSO,
TOC, DOC, UV254, Turbidity, Color, Chlorine, pH or Redox, Conductivity, Temperature and Pressure. The real-time data can be transmitted to any central database via almost any communication protocol using the revolutionary terminal con::cube. Therefore multiple pipe::scans are the ideal solution to monitor drinking water at any point in the distribution network.
The pipe::scan provides unique benefi ts like a quick installation directly on the pipe, maintenance without interrupting the fl ow and for each sensor individually and accurate, reportable measurements in perfect agreement to standardized lab reference. The installation is performed on the pipe under pressure by utilizing Hawle pipe saddles (sizes from DN100 - DN600). Via a “straw”, the water from the pressured pipe is pushed into the pipe::scan fl ow cell. A nano pump ensures that the water is pumped through the fl ow cell and back into the pipe without water loss and even during periods of stagnation.
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