Organic monitoring tools and real-time monitoring requirements

Online TOC Monitoring - Addressing Common Challenges

Determining the organic load in the influent of wastewater treatment plants presents multiple challenges for TOC analyzers. On the one hand,The degree of pollution may vary greatlyThis situation mainly occurs in industrial applications when wastewater from batch processes is discharged or when liquid leakage occurs unexpectedly. Meanwhile,These organic compounds may be composed of highly complex components that are difficult to decomposeIn addition, high concentrations of undissolved particles and dissolved inorganic components (such as salts) may appear in the influent.

The requirements of this application for online TOC analyzer are mainly reflected inrobustnessaspect. Suitable monitoring instruments must be able to detect large-scale concentration fluctuations, which may range from well below 100 ppm to tens of thousands of ppm. Similarly, monitoring instruments must also be robust enough to detect higher concentrations of dissolved and particulate components.

The latter can easily cause blockages in the internal piping system of devices with smaller inner diameters. In addition, the installation conditions of such instruments in the process are often very demanding, which requires robust design.

However,Understanding organic load is an important parameter for optimizing subsequent cleaning stepsOnline TOC monitoring can ensure that the biological treatment stage will not be overloaded when there is a deviation in organic load. Overloading can kill the bacteria needed to decompose organic matter. In this case, due to the ability of appropriate monitoring tools to quickly identify high organic loads, the corresponding portion of incoming water can be effectively transferred to the buffer tank and maintain bacterial health. When the load is low, highly polluted water can be refluxed. Similarly, in anaerobic reactors, it is important to ensure that the influent concentration remains as constant as possible to achieve optimal degradation results. On the contrary, if the organic load in the influent is too low, organic compounds such as methanol can be added based on TOC detection to provide sufficient food for bacteria to efficiently degrade.

TOC monitoring from sewage treatment plants is mainly used forCheck if the drainage meets the prescribed discharge limitsAt the same time, it can display whether the degradation process in the sewage treatment plant is proceeding normally. In these cases, fines for exceeding the limit can be avoided and regulatory compliance can be achieved.

After treatment, the TOC concentration in the effluent is significantly lower than that in the influent. However, residual organic matter is usually those substances that are difficult to degrade. Accurate detection of these substances is necessary to detect when the limit is exceeded. Therefore, the analyzer must provideHigh reliabilityFor example, capturing all organic carbon and having extensive self-monitoring capabilities. Automatic verification testing or calibration should ensure that the detection values are always correct. In addition, the self diagnostic function can be used to check the overall status of the equipment and carry out preventive maintenance work accordingly. This extends the online time of the analyzer and ensures seamless monitoring of limits to meet regulatory requirements.

In industrial applications, steam is a commonly used heat transfer medium. The water used for steam generation must meet special requirements to avoid problems during the boiler and steam stages. Require pre-treatment of water and addition of water treatment chemicals. Mainly to inhibit the formation and corrosion of sediments. When water evaporates, dissolved substances will remain and form scale, leading to the accumulation of sludge in the boiler. However, there may also be volatile inorganic and organic compounds entering the gas phase and accumulating in pipelines and heat exchangers. This not only reduces the width of the path through which steam passes, but sediment also reduces heat transfer, resulting in energy loss. In addition, due to the formation of a certain temperature gradient, the sediment generates thermal stress, leading to minor cracking and leakage.

Corrosion is mainly caused by a low pH value. Organic impurities play a major role here, as many organic compounds decompose and form organic acids under high temperature conditions in boilers and steam. This lowers the pH value in the steam and exacerbates corrosion until a leak is formed.

In addition to the pre-treatment process, organic matter mainly enters the steam cycle through small leaks. Due to the complex and expensive treatment of boiler water, most of the condensed steam is usually returned. If organic matter escapes into the condensate through small holes in the heat exchanger, it will return to the steam cycle.

Due to the fact that most organic compounds are not in an ionic state before decomposition, traditional conductivity measurements cannot detect them or accurately record them. Here, TOC provides a solution.

In this application, the challenges faced by TOC analyzers arequick responseCompared with wastewater, in addition to having a lower detection range, the detection cycle is also important because the detection target is to detect whether a leak has occurred before the contaminated condensate water returns to the boiler feedwater, thereby avoiding the need to spend huge financial resources to replace the boiler feedwater. Therefore, a shorter detection cycle can almost seamlessly monitor condensed water, enabling timely corrective measures to be taken before pollution becomes a problem.

More easily detect organic pollution

And enhance troubleshooting capabilities