Drinking water is the main nutrient. Therefore, not only must the transportation in the drinking water network be ensured, but also the good quality of consumers must be ensured. At present, the quality of drinking water is ensured by laboratory samples, which must be carried out by the water company in accordance with the authorities/laws (drinking water regulations) at specified time intervals. The actual drinking water regulations are intended to be improved by shifting from routine sampling to sampling plan adjustments based on risk assessment.
On the one hand, this method is expensive because it needs to collect, transport and analyze most of the samples of the drinking water network from week to month. On the other hand, due to its slow dynamics, pollution incidents are usually almost impossible to detect or impossible to detect. arrive. In order not to rely on the prescribed frequency of inspections and to increase transparency, many water suppliers around the world require online sensors to respond in real time to issues related to water quality in drinking water distribution networks.
Online sensors used in drinking water networks should continuously monitor and provide quantitative, high-resolution, and validated measurements to assess water quality. The environmental conditions in manholes and pipes are not trivial. Therefore, it must meet the minimum IP67 protection level requirements and the drinking water certification standards for materials in contact with water. If the sensor is to be measured in a pressurized pipeline, such a system must be very robust in order to provide good results regardless of pressure fluctuations and pressure bursts. The sensitivity, maintenance and power requirements of this “online analysis” must be reduced to an absolute minimum. The prerequisite for each online measurement is not only a powerful sensor, but also the real-time transmission of data to the database/SCADA system so that it can react to alarms and changes in the measurement data.
pipe::scan (Figure 8) is a sensor system used to monitor the quality of drinking water in pressurized pipes. Up to 10 parameters can be measured in a system: organic parameters (TOC, DOC, UV254/UVT), turbidity, color, chlorine, pH/redox, conductivity, temperature and pressure. Install on the pipeline under pressure through the Hawl pipe saddle (DN100-DN 600). Through the “pipette”, the water from the pressure pipe is pushed into the pipe :: scanning flow cell. The nanopump ensures that water is pumped back to the pipeline through the flow cell without losing water, see Figure 2. Functional principle. The sensor in pipe::scan is a well-known and reliable s::can sensor, which has been sold in the market for many years: i::scan-an optical micro-spectrophotometer with LED technology and automatic brush cleaning for measuring organic matter ( TOC, DOC, UV254, UVT), turbidity and color, chlori::lyser-a pressure current sensor for detecting free chlorine, pH::lyser-a very robust pH sensor, no salt bridge, with There are polymer reference electrodes, condu::lyser-a 4-electrode conductivity sensor with integrated temperature sensor and miniature pressure sensor suitable for industrial use. All these sensors require extremely low maintenance and have been used in drinking water applications worldwide for several years. The filter in the inlet ensures that no large particles enter the flow cell, and the ventilation valve ensures that there is no air in the measurement environment in the flow cell. Water quality data can be sent to any central database through almost any protocol by using the s::can terminal con::cube. con::cube is a compact, powerful and multifunctional terminal for data acquisition and control. By integrating the latest processor technology, con::cube’s flexible interface for connecting sensors to SCADA or any central database system is ideal for remote monitoring. Due to the integrated modem and low energy consumption, the data logger meets all operational requirements for decentralized installation locations.
Multitube::Scan is the ideal solution for monitoring drinking water in a drinking water network at any accessible point. Some of these systems have been installed in power distribution networks in major European cities for a long time. From the data, it can be seen how the continuous measurement of multiple parameters performs with high resolution and no drift under the conditions of continuous months of pressure fluctuations, see Figure 4. In detail, you can see the network of daily and night pressure fluctuations of drinking water between 3 and 4 bar. Significant changes in conductivity indicate different water sources, in this case, for example, groundwater or treated surface water. In addition, with pipe::scan, organic parameters such as TOC, DOC or UV254 can be measured very accurately. These parameters are essential for determining contamination events in drinking water and detecting the mixing of water from different sources, see Figure 5. In the drinking water network of another city, it can be seen that although the concentration of certain parameters is constantly changing (Figure 6)), the alarm limit is not reached. However, with the extremely stable and accurate pipe::scan measurement, see Figure 7, you can see in detail that the free chlorine dropped sharply within a few hours, and therefore, sufficient disinfection was not performed. Drinking water network at this time-an unwanted situation.
Figure 8: pipe::scan is a sensor system used to monitor the quality of drinking water in pipes under pressure.
pipe::scan is currently the only sensor system on the market with the following unique features: • Accurate measurement is completely consistent with standardized laboratory references, not just “trends” • Up to 10 parameters in a system • Continuous monitoring of organic matter (TOC) , DOC, UV254, UVT), turbidity, color, pH/redox, EC, pressure and temperature • It is completely independent of the flow rate and can work normally even under stagnant conditions in the drinking water network. • “Heat maintenance under pressure” “: No need to interrupt the water supply flow/pressure and each sensor can be used separately • Full event detection with real-time alarms • 6-month maintenance interval: efficient, reliable, independent operation, with minimal maintenance. Direct measurement of water quality in the drinking water network Innovative methods of online sensors provide very valuable and comprehensive information, such as when a pipeline ruptures or a chlorination station has problems, these events may lead to a risk of drinking water. Drinking water safety is very important worldwide. By providing extremely stable, accurate and powerful sensor technology, pipe::scan is no longer a topic in the future, but has become a reality.
[1] The original version of the Federal Minister of Social Security and Generations Directive on the Quality of Water for Human Consumption (Drinking Water Regulations-TWV): Federal Law Gazette II No. 304/2001 [CELEX-No.: 398L0083]
In this issue of Business News-Australia-UK partnership in ambient air monitoring-what will be the speeches at the PEFTEC conference? -The Swedish Energy Agency allocated 30 million euros…
International Labmate Limited Oak Court Business Centre Sandridge Park, Porters Wood St Albans Hertfordshire AL3 6PH United Kingdom
Post time: Sep-13-2021
