Technical GlossaryJul 5, 2026
What Is Glass-Fused-to-Steel (GFS) Coating?
GFS is a coating made by fusing a ceramic glass layer onto steel at about 850 °C, creating an inert, low-maintenance surface for tanks.
Read article→TECHNICAL BLOG
Technical Glossary
Technical articles on bolted tanks, biodigesters and treatment — from engineering to the field.
Technical GlossaryJun 27, 2026
What Are BOD and COD in Wastewater?
BOD measures the oxygen microorganisms use to break down organic matter; COD measures the oxygen needed to oxidize it chemically. Both are in mg/L.
Read article→Technical GlossaryJun 19, 2026
What Is Biomethane and How Does It Differ From Biogas?
Biomethane is biogas upgraded to over 95% methane, equivalent to natural gas. Key differences from biogas, how it is produced and what it is used for.
Read article→Technical GlossaryJun 11, 2026
What Is a Gas Holder?
A gas holder stores the biogas produced by a biodigester at low pressure. Storage types, the double-membrane design and its role in a biogas plant.
Read article→Technical GlossaryJun 3, 2026
What Is Hydraulic Retention Time (HRT)?
HRT is the average time liquid stays inside a reactor. It is calculated as volume divided by flow rate: HRT = V / Q.
Read article→Technical GlossaryMay 30, 2026
What Is the AWWA D103 Standard?
AWWA D103 is the standard that defines the design and factory coatings of bolted steel water storage tanks. A concise technical guide.
Read article→Technical GlossaryMay 26, 2026
What Is Digestate and What Is It Used For?
Digestate is the stabilized effluent that leaves a biodigester: an NPK-rich biofertilizer. Composition, handling and agronomic value explained.
Read article→Technical GlossaryMay 22, 2026
What Is H2S and Why It Matters in Biogas and Odors?
H2S or hydrogen sulfide is a toxic, corrosive gas with a rotten-egg smell, central to biogas, wastewater and odor control.
Read article→Technical GlossaryMay 18, 2026
What Is a CSTR Reactor?
The CSTR is a continuously stirred, fully mixed reactor, the most common digester design in anaerobic digestion for thick substrates.
Read article→QUOTE · CONFIDENTIAL · 5 DAYS
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