![Where Have All the Solids Gone?](https://cole-tpomag.imgix.net/https%3A%2F%2Fwww.tpomag.com%2Fuploads%2Fimages%2Ffigure_1_180122_114148.jpg?crop=focalpoint&fit=crop&fp-x=0.5&fp-y=0.5&h=620&ixlib=php-1.1.0&q=75&w=1024&s=75b6afd259f4cac2d639a99de8ee5661)
Early one morning, the Lab Detective received a call from a local operator, who described an extended aeration activated sludge package-type wastewater treatment plant serving a small community, with a permitted capacity of about 50,000 gpd.
The operator said the plant had been...