Digestion — Wastewater Process

Sludge stabilization, biogas capture, and digester mixing — turning biosolids into a manageable, stabilized end product.

What is Anaerobic Digestion?

Anaerobic digestion stabilizes sludge by breaking down organic matter without oxygen — reducing volatile solids, destroying pathogens, and producing biogas (primarily methane) as a recoverable energy source. The key operational challenge is ensuring effective mixing: without it, temperature gradients form, scum accumulates, grit settles, and active zones shrink — all of which reduce volatile solids destruction and biogas production. Proper digestion equipment selection directly impacts both biosolids quality and energy recovery.

Equipment We Represent

Landia — GasMix Digester Mixing System

Recirculates a mixture of liquid and biogas to mix the digester
All mechanical components outside the tank — service and maintenance without emptying or entering the sealed environment
Documented to increase sludge reduction and biogas production
Works with most tank types at volumes to 350,000 cubic feet and dry matter to 14%
Landia is the only supplier offering this external-component approach to digester mixing

Landia — Chopper Pumps for Digester Feed

Submersible and dry-installed chopper pumps for digester feed preparation
Reduces particle size and prevents accumulation in feed lines and the digester
Stainless construction for pH and corrosion resistance
BioChop system available for food waste co-digestion preprocessing

EFI Environmental Fabrics — Covered Lagoon Digesters (CLDs)

489+ operating biogas lagoon systems in the US
Geomembrane covers create hermetic seals for biogas collection while eliminating VOC and H2S release
Complete systems including: floating covers, gas conditioning, flaring, cloud-based monitoring, and O2 injection for H2S removal
GHG reduction up to 95%
Odor reduction over 90%

LobePro — S-Series Rotary Lobe Pumps (Sludge Transfer)

S-Series rotary lobe pumps for sludge transfer to and from digesters
Self-priming, handles thickened and digested sludge
Flow capacity to 2,500 GPM

Applications

Mesophilic Anaerobic Digestion
Municipal sludge stabilization in conventional enclosed digesters

Covered Lagoon Digestion
EFI geomembrane covers for existing lagoons with biogas capture

Digester Mixing Retrofit
Landia GasMix upgrade for digesters with poor mixing performance

Food Waste Co-Digestion
Landia BioChop preprocessing for food waste addition to increase biogas yield

Odor and Emissions Control
EFI covers for open lagoons generating H2S and VOC odors

Sludge Feed and Transfer
LobePro rotary lobe pumps for thickened and digested sludge handling

Why Winschel Environmental?

External-component mixing — Landia GasMix is the only digester mixing system with all components outside the tank, eliminating confined space entry for maintenance
Covered lagoon expertise — EFI has 489+ operating installations and provides complete systems including gas handling and monitoring
Co-digestion capable — Landia BioChop system prepares food waste for co-digestion to increase biogas yield
Complete sludge train — mixing, pumping, and cover systems from one representative
Virginia coverage — local support for process evaluation, startup, and service