The challenge: Banishing gremlins in screening

摘要

Screenings are unpleasant, smelly, stomach-churning and for many of us office-based design engineers, they are the most obvious reminder that we work in the field of sewage. Which is probably why, the screening and grit removal processes are often left to their own devices on many sites. However, not having a well performing screening process can have far reaching consequences with significant impacts on final effluent quality, treatment plant capacity, operator morale and with growing importance today, on operating costs. You may well ask how screenings cause such chaos in a treatment plant? So indulge me for a moment and allow me to draw an analogy with one of the most iconic characters of the eighties, The Gremlins. Screenings rather than being the cute and cuddly Gizmo variety are more akin to the post-midnight fed mischief makers, purposely destroying vital pieces of equipment used on treatment plants just for the sheer fun of it (okay, I'm stretching the analogy, but you get what I'm saying).