In what scenario is it crucial to monitor head loss in a filtration system?

Monitoring head loss in a filtration system is crucial to prevent air binding of filters. Air binding occurs when air pockets form within the filter media, obstructing the flow of water and reducing the efficiency of the filtration process. When head loss increases significantly, it indicates that the filter is becoming clogged, which can lead to the accumulation of air pockets. By continuously monitoring head loss, operators can assess the condition of the filter and take preemptive action, such as backwashing or replacing the filter media, to avoid air binding. This proactive approach helps maintain the overall performance and efficiency of the filtration system.

In contrast, the other scenarios mentioned may have their own importance but do not directly relate to the critical need for head loss monitoring to prevent air binding. For instance, while monitoring during low flow conditions or before chemical addition can be important for different operational reasons, they are not primarily focused on preventing air binding. Similarly, head loss during backwashing is typically addressed through different operational protocols aimed at restoring the effectiveness of the filter rather than preventing air binding.