Suspended Growth Systems — Biological Treatment

Activated sludge, SBR, and BNR systems that harness suspended microorganisms to remove BOD, TSS, nitrogen, and phosphorus.

What is Suspended Growth Biological Treatment?

Suspended growth biological treatment keeps microorganisms mixed in suspension within wastewater — where they consume organic matter, nitrify ammonia, and in advanced configurations, remove nitrogen and phosphorus through anoxic and anaerobic reactions. It's the core of most modern municipal wastewater treatment. Process variations include conventional activated sludge, extended aeration, sequencing batch reactors (SBR), and biological nutrient removal (BNR) — each suited to different plant sizes, effluent requirements, and site constraints.

Equipment We Represent

Fluidyne — ISAM (Integrated Surge Anoxic Mix)

Total treatment system: BOD, TSS, and nitrogen removal with integrated sludge reduction
Reduces waste solids production by up to 75%
Raw wastewater enters a covered anaerobic reactor for pretreatment and sludge digestion, then flows to the SAM reactor for biological treatment
Available as packaged plants (carbon steel, epoxy-coated) with full redundancy
Applications: municipal plants, travel centers, food processing facilities, and small communities

Fluidyne — Sequencing Batch Reactor (SBR)

Fluidyne was the first company globally to commercially design, build, and operate SBR technology
300+ plants operating worldwide
Single tank handles biological treatment, oxidation, sedimentation, nitrification, and denitrification
Fixed solids-excluding decanter with no moving parts

Fluidyne — Jet MCR Oxidation Ditch

Proprietary oxidation ditch design using Fluidyne jet technology for aeration and mixing
Extended aeration process for small to medium communities

AeroMod — SEQUOX / SEQUOX+ BNR Process

Patented SEQUOX process: sequencing aeration with continuous clarification
Achieves total nitrogen levels of 3 mg/L
SEQUOX+ with Bio-P achieves phosphorus below 1 mg/L
DO2ptimizer control strategy: matches dissolved oxygen delivery to actual organic loading for optimal energy efficiency
Includes a selector tank to precondition raw wastewater and inhibit filamentous growth

Fluidyne — SBR, ISAM & Oxidation Ditch Systems

Sequencing Batch Reactor (SBR) systems for BOD, TSS, and nutrient removal
ISAM integrated surge anoxic mix systems for variable-flow applications
Oxidation ditch and jet aeration/mixing for extended-aeration biological treatment

Applications

Municipal Wastewater Treatment
BOD, TSS, and nutrient removal for permit compliance

Nutrient-Sensitive Watersheds
Advanced BNR for nitrogen and phosphorus limits

Package Plant Applications
Small communities, travel centers, food processing

Sludge Minimization
ISAM process for facilities seeking to reduce biosolids production

Sequencing Batch Reactors
Single-tank biological treatment with sedimentation

Oxidation Ditch Upgrades
Jet MCR technology for existing oxidation ditch facilities

Why Winschel Environmental?

Multiple process options — ISAM, SBR, oxidation ditch, and BNR technologies to match your permit requirements and site constraints
Proven technology — Fluidyne SBR was first-to-market globally with 300+ operating installations
Advanced nutrient removal — AeroMod SEQUOX achieves some of the lowest TN and TP levels in the industry
Sludge reduction option — ISAM cuts waste solids production by up to 75%, significantly reducing biosolids handling costs
Virginia coverage — local support for process evaluation, startup, and service