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Anaerobic/Aerobic Treatment of Wet Corn Milling Wastewater
Background-
A company using a wet corn milling operation required treatment of the process wastewater to meet the requirements of the State of Indiana. Due to the location of the facility, a treatment system with no discharge of treated water was needed. An anaerobic/aerobic process including land application was selected because of the wastewater characteristics, degree of the treatment necessary, and low operational requirements.
System Description-
The system consists of solids recovery, a two-stage high-rate anaerobic process, anaerobic process units, and land irrigation system. Solids recovered during the initial steps are used as an animal feed supplement. The solids recovery, combined with the high-rate anaerobic process, provides 75% BOD's and 80% TSS reduction prior to the low-rate system. The low-rate anaerobic and aerobic process units provide final treatment and effluent polishing prior to land application. Overall reduction of organics through the treatment system is 95% BOD's and 90% TSS.
Another function of the low-rate process is to receive all biosolids produced in the various process and provide further degredation. This reduces the need to waste biosolids to once every three to five years. Sufficient land is available to apply the biosolids to the land.
The high rate anaerobic system consists of a 35 ft. diameter by 24 SWH EQ/conditioning tank followed by a 52 ft. diameter by 24 SWH anaerobic reactor. The low-rate anaerobic process utilizes a 260 ft. x 520 ft. x 20 ft. water depth lagoon. The aerobic system includes a 135 ft. by 279 ft. lagoon divided into facultative, seated and clarification zones. The land application process consists of an 80 acre fixed nozzle irrigation system.
Project Scope-
Owner required a complete "Turnkey" approach to the wastewater treatment system. MRV provided all permitting, engineering, process design, procurement, project/construction management, installation and system start-up. MRV is also providing contract operations for the first three years and assumes liability for meeting operating permit compliance.
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