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System Upgrade of a Snack Food Process Wastewater Pretreatment Plant
Background-
A snack food company in the Midwest had been experiencing noncompliance with pretreatment parameters of the wastewater pretreatment plant (PTP) since start-up in 1991. The system was to pretreat 150,000 gpd from a potato and corn snack food operations and discharge to the municipal sewer. A dual tank Sequencing Batch Reactor (SBR) was previously constructed to meet the pretreatment requirements.
Project Description-
The original PTP consisted of oil skimming, screening, dual basin SBR, sludge holding tank and plate/frame dewatering system. The owner had a two-fold requirement for the PTP, bring the existing PTP into compliance with pretreatment standards and provide for future production increases. MRV was able to meet both objectives at a minimal capital cost and little increase in operating cost. The approach was to install a solids recovery clarifier to reduce organic loading to the SBR system. In addition, the recovered solids are dewatered and are now a saleable byproduct. The organic reduction to the SBR system allows the system to handle a 120% increase in hydraulic and organic loading to allow for future production increases. Due to the decrease in organic load to the SBR's, a 80% reduction in biosolids is being experienced thereby reducing the cost of disposal of biosolids from the PTP.
The project includes a 30 ft. diameter by 16 ft. SWH solids recovery clarifier, solids recovery/dewatering system, new 30 ft. by 45 ft. solids recovery operations bulding, new diffused air aeration system in sludge holding tank and associated pumping equipment. The PTP is capable of treating 325,000 gpd with an influent organic load of 2,400 mg/L BOD and 5,600 mg/L TSS. Original design parameters were 150,000 gpd with 4,000 mg/L of BOD and 4,600 mg/L of TSS. Pretreatment requirements are 250 mg/L BOD and 250 mg/L TSS.
Project Scope-
MRV was retained to provide design, project/construction management, procurement, installation and start-up of the PTP upgrade.
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