Decentralized Sequencing Batch Reactor and Wastewater Learning Lab Hannah Bertsch*, Holly Hays*, Martin Valerocases* *Department of Civil, Construction, and Environmental Engineering, San Diego State University

Design Concept Sequencing Batch Reactor (SBR) The SDSU Mission Valley Campus will incorporate a decentralized wastewater treatment system DEWATS that will treat building B2. SBR Advantages DEWATS Process Wastewater from the building will be treated in a ● Entire treatment process takes ● All wastewater will be processed in SBR, the effluent will be disinfected to class A place in 1 tank. 1 of 3 sequencing batch reactor using UV. The water well be sent to four water ● Operating flexibility to handle located underground. towers across campus. The water towers will varying flow from academic year ● The SBR achieves denitrification supply irrigation throughout the campus. The to breaks. (nitrogen removal) and phosphorus building will also house the wastewater modular ● Capital costs savings removal by changing the conditions learning lab.This lab will offer five bench scale ● Low maintenance in the tank from aerated to non treatment options. ● High treatment efficiencies for aerated. The SBR was chosen because of its small BOD, COD, TSS, N, and P ● Following the 6 hour treatment the footprint and savings after the capital cost. The ● Biogas Capturing available. clean effluent will pass through a UV Figure 2: DEWATS Concept SBR requires significantly reducing the O&M cost Figure 1: SBR Process Flow disinfection system. The water will compared to any other traditional system. be transported to a 1 of 4 water towers across campus

Wastewater Learning Lab Water Reuse This wastewater treatment offers students and researchers 5 processes sedimentation, activated sludge, biofilm trickling filter, anaerobic, and Sequencing Batch Reactor.

● The Activated sludge system will be online at all times. ● The sedimentation system is equipped with a suspension tank that allows the operator to change the wastewater characterizes using Figure 5: Green roof chemicals or other additives. It can be used Figure 3: Learning Lab (A holding tank, B suspension independently and is the connection port for the Water Reuse Cost Analysis tank, C sedimentation tank, D collection tank, E remaining treatments. 390,000 gallons per year available for reuse modular cart). ● The biofilm trickling filter (Figure 1, E), Savings $24,000 per year. anaerobic, and SBR are all on a separate carts Lab Objective to protect the system while not in use and to Water Usage provide the ability add additional treatment Estimate irrigation area = 20,000 sq ft The objective of this learning lab is to offer students a processes without changing the physical lab. Drip watering system = 12,335 gal/week custom hands on learning experience. Researchers Figure 4: Decorative water ● Each of the treatments offered have adjustable towers across campus for ● Drought resistant plants will have the ability to test multiple treatments and parameters like flow rate, biological media, and recycled water storage. ● Watered three times per week adjust the system to create the scenario of the can be retrofitted for biogas collection. 5 Campus buildings with green Spring 2020 research rooftop = 9,500 gal/week