Abstract: Apparatus for treatment of wastewater which has pre-treatment apparatus for treatment of wastewater which has at least two separation tanks connected in series through which the wastewater is passed wherein there is provided a vertically oriented baffle pipe having a closed top and an open bottom which is attached to or located adjacent a side wall of a first tank Which traps triglycerides, fats or other particulate impurities in the wastewater for subsequent passage into a second tank through a primary conduit which interconnects the first and second tanks. The apparatus also includes post-treatment apparatus for treatment of wastewater after passing through an electrocoagulation cell incorporating at least one coagulation tank having a baffle located below a top end of the coagulation tank which has a spray nozzle associated therewith for washing floc off an interior of the tank whereby the floc is discharged through a conduit which extends through a side wall of the tank below the baffle.