Blog Article

A few days ago we received a very interesting query, a client asked us to incorporate lamellar modules together with a circular scraper, for his secondary settler because wasn’t working properly.

Apparently plenty of solids were escaping by water collection channels and for that reason the client thought the best solution was to incorporate lamellar modules.

After studying the technical data of the Waste Water Treatment Plant, TecnoConverting Engineering noted that the secondary settler was correctly dimensioned to operate without lamellas.

So, why solids escape out to clarified water? The answer was obvious:

The settler didn’t had installed a sludge scraper and the solids were extracted only with a purge pump. Those made the solids rise to the surface and escape by through channels.

The best solution in these cases is always to install a scraper to collect all sludge and send them to the purge pump, thus so many problems of floatation of the sludge is avoided.

The customer still hesitated, and when he purged the mud there was a lot of extract, so he assumed that there was sludge on the bottom of the settler. This is completely wrong: as described in the past, if the sludge is not removed in a settler without a scraper doesn’t mean at all that sludge hasn’t been accumulated; but the extraction pump is unable to remove the sludge that falls outside their area of influence in the extraction.

Our recommendation was clear: The client had to add a good scraper system and he had, it wasn´t needed to incorporate lamellar modules with a support structure, since the settler was well designed.