Technical Bulletin No. 0364: Laboratory and Field Experiences with Chemically Assisted Clarification of Pulp and Paper Biologically Treated Effluents

One of the control technology options considered in the review of effluent guidelines for the pulp and paper industry was chemically assisted coagulation of biologically treated effluents. The available information base on treatment system design parameters, performance, sludge generation rates and disposal problems, construction and operating cost of this technology, was felt to be inadequate for the development of a technology-based effluent standard. The impetus for carrying out the investigative work described in this technical bulletin therefore evolved from the lack of little more than generalized information to address these questions, rather than any residual benefit from further reduction in suspended solids of biological treatment origin, which have been shown to have no detrimental effect on receiving waters at the currently allowable levels of discharge.