The state of Delaware said it has granted permission to Mountaire Farms to store sludge at its Millsboro poultry complex, as the next step in a multi-year plan to improve the facility’s wastewater treatment process. The Delaware Department of Natural Resources and Environmental Control issued a permit that allows Mountaire to transfer excess sludge to a previously abandoned lagoon at the facility that the company intends to retrofit for short-term storage. The process will speed up removal of excess sludge from two other lagoons, the state said in its order, published online this week. The sludge then will be prepared for off-site disposal.