NWD have good experince in refinery wastewater treatment , produce wastewater treatment and API seperator for  oily w astewater. Refinery wastewter is now quit established and they typical process is API seperator, DAF, biological treatment and clarification or recycling of effluent. For produce wastewater we normally recommended electro-coagulation that is effective for removal of produce oil and heavy metals. For rate of evaporation calculation we utilizes CHARM software to optimize the rate of evaporation in solar ponds.