Attached Growth Systems — Biological Treatment

MBBR and IFAS technologies from Entex — increase treatment capacity in existing tanks without adding footprint.

What is Attached Growth Biological Treatment?

Attached growth (fixed-film) biological treatment grows microorganisms on media surfaces rather than maintaining them in suspension. MBBR (Moving Bed Biofilm Reactor) and IFAS (Integrated Fixed-Film Activated Sludge) systems dramatically increase the biomass available for treatment within an existing tank volume — without requiring additional tankage. This makes them ideal for facility upgrades where expanding footprint is constrained by cost, space, or site conditions. The biofilm on the media provides stable, high-density treatment capacity even under variable loading conditions.

Equipment We Represent

Entex Technologies — WavTex (Moving Woven Media)

Patent-pending EnTextile media sheets that move independently in the aeration basin
No media retention screens required — unlike traditional MBBR plastic media
Compatible with both fine and coarse bubble diffusers
Achieves simultaneous nitrification/denitrification in a single tank
Biologically active surface area: 1,156 m²/m³
Applicable to IFAS and SFF process modes

Entex Technologies — Webitat (Fixed Stainless Steel Media)

Patented BioWeb media (304L stainless steel) with integral diffusers and shrouding
Shrouding maintains optimal biofilm thickness and prevents sloughing
Three application variants:
- Lagoon upgrades — addresses mixing, aeration, and biomass concentration in a single module
- Oxidation ditch retrofits — the only proven in-situ IFAS upgrade for operating oxidation ditches
- SBR capacity increases — adds fixed-film biomass to existing SBR tanks

Entex Technologies — BioBloc (Floating Fixed-Film Modules)

Floating fixed-film modules with integrated fine bubble diffusion
Applicable to lagoons, tanks, and activated sludge systems
35+ facilities installed since 1999
No plant downtime for installation — modules float out and connect air hoses
Unit sizes from 40 to 480 cubic feet media volume
BOD and ammonia removal with toggleable nitrification/denitrification mode

Entex Technologies — Packaged Plants

Complete treatment solutions combining IFAS technology with packaged plant designs
Capacity range: 10,000 GPD to 3.0 MGD
Modular, compact footprint, quick installation

Applications

Capacity Expansion Without New Tanks
Increase treatment capacity in existing basins using fixed-film media

Lagoon Upgrades
BioBloc and Webitat convert underperforming lagoons to effective biological treatment

Oxidation Ditch Retrofits
Webitat provides in-situ IFAS upgrade without taking the ditch offline

Nitrification
High surface area media supports robust ammonia removal even at low temperatures

New Package Plant Treatment
Entex packaged plants for small communities and industrial applications

Simultaneous Nitrification/Denitrification
WavTex achieves SND in a single tank, simplifying nutrient removal

Why Winschel Environmental?

Full Entex product line — WavTex, Webitat, BioBloc, and packaged plants all through one representative
Upgrade path for every technology — lagoons, oxidation ditches, SBRs, and activated sludge basins all have specific Entex solutions
No-downtime installation options — BioBloc installs without taking systems offline
No media screens — WavTex eliminates the screen maintenance issue inherent in traditional plastic media MBBR
Virginia coverage — local support for process evaluation, startup, and service