SBR FOR LOW FLOW APPLICATIONS

SBR FOR LOW FLOW APPLICATIONS

The Dutchland Sequencing Batch Reactor uses high quality precast concrete structures to handle all of the work of a continuous flow treatment system. All processes - biological oxidation, sedimentation, nitrification and denitrification occur in a single chamber. Multiple tanks are used in alternating sequence. 160 Rt. 41, Gap, PA 17527

The Dutchland SBR is the perfect solution for: Lower flows Tight sites Biological Nutrient Removal (BNR) applications A broad range of inflow loadings The Dutchland SBR is simple, cost-effective and delivers exceptional effluent quality. Typical effluent quality results of Dutchland s SBR: BOD: 10 mg/l TSS: 10 mg/l Total Nitrogen: 8 mg/l Total Phosphorous: 0.5 mg/l Phone: (717) 442-8282 www.dutchlandinc.com 2

DUTCHLAND PROCESS DESIGN Mini - Sequential Batch Reactor The standard Dutchland SBR system consists of two SBR reactors, Influent Equalization, Sludge Holding, and Post Equalization (if downstream processes require a steady wastewater flow). The Dutchland SBR is a true fill and draw or batch process. The treatment cycle or phases follow the same pattern every cycle: Anoxic (mixed) Fill, Aerated React, Settle, Decant, and Idle. The Anoxic Fill stage occurs when influent flow is fed to the individual reactor from Influent Equalization. Raw wastewater containing organics mixes with the biomass in the reactor. Only mixing (no aeration) takes place. Since there is little to no Oxygen available, the bacteria use the nitrate nitrogen as an electron acceptor. In this mode, denitrification takes place where the nitrate nitrogen is converted to nitrogen gas. This stage is comparable to an anoxic zone in conventional BNR activated sludge systems. The next phase of the treatment process is the aerated react phase. In this phase, mixing and aeration take place. In the aerated environment, the bacteria consume the BOD and Ammonia Nitrogen in the presence of Oxygen. This is where nitrification takes place which ultimately leads to the presence of nitrates which are consumed in the subsequent Anoxic Fill stage. In the settle phase quiescent conditions are provided. The aerators and mixing are turned off. There is no influent wastewater fed to the SBR either, which would potentially interfere with settling.the Decant step is where treated wastewater is discharged from the SBR. To accomplish this, the Dutchland system uses a floating decanter. These decanters offer several advantages because the inlet orifice is always submerged below the water surface minimizing scum and floatables from being discharged. Sludge is wasted during the Idle Phase. In this phase, there is no mixing or aeration. The length of this phase depends on the operating strategy and amount of solids to be wasted. This phase also can be shortened or lengthened to buffer high influent flows. 160 Rt. 41, Gap, PA 17527

SBR CYCLES The Dutchland SBR is a true batch process. It utilizes a two tank arrangement. When one SBR tank is going through its cycles, the other SBR is receiving influent flow. FILL Anoxic Fill - Wastewater fills the tank under non-aerated, mixed conditions. Denitrification takes place where influent BOD is used as a carbon source. IDLE REACT IDLE - Sludge removal takes place. A waste pump pumps the waste sludge to a sludge holding tank. React - Aeration admixing takes place to stimulate biomass growth. In this phase, BOD and Nitrogen reduction take place. DECANT SETTLE Decant - During this phase, clarified supernatant is withdrawn from the top of the tank and discharged to downstream processes. Settle - Mixing and aeration are stopped. This allows the mixed liquor to settle to the bottom of the tank. Phone: (717) 442-8282 www.dutchlandinc.com 4

ADVANTAGES OF CHOOSING THE DUTCHLAND SBR: Package solution in maintenance-free precast concrete tanks Produces high quality effluent Small footprint Cost effective solution, direct from the designer/manufacturer Greater operating flexibility and control Custom-designed controls for optimal performance Concrete tanks promote more stable wastewater temperature Modular and wall panel precast concrete tanks allow for fast and easy installation Tanks can be fully buried, or partially buried Experience - Dutchland has built over 500 packaged wastewater treatment solutions Process performance warranty 160 Rt. 41, Gap, PA 17527

DUTCHLAND STRUCTURAL DESIGN Dutchland is a PCI-certified precaster that specializes in the design, manufacturing and construction of environmental structures. Dutchland s custom solutions for on-site treatment are contained in precast tanks which provide superior material benefits while requiring the lowest maintenance. Structure Options: Modular Precast 5,000 GPD - 15,000 GPD Panelized Precast 15,000 GPD - 100,000 GPD Phone: (717) 442-8282 www.dutchlandinc.com 6

Dutchland s multi-disciplinary design team partners with each customer to develop tailored solutions for their unique wastewater needs. Some of our services include: Preliminary Design & Feasibility Studies Regulatory Permit Submissions Turn-key Engineering Plans & Specifications Contact Dutchland today: (717) 442-8282 info@dutchlandinc.com 160 Rt. 41 Gap, PA 17527 Phone: (717) 442-8282 Fax: (717) 442-9330 www.dutchlandinc.com