Reverse osmosis (RO) concentrate — brine, or reject water — represents 25–50% of the feed volume in a typical RO system, and routing that stream through additional treatment loops can push overall water recovery from the conventional 75–85% range to 92–97%, cutting both freshwater intake and discharge volume. Conductivity is the standard real-time surrogate for…
The Chemistry Behind Digester Souring Mesophilic anaerobic digestion depends on a fragile balance between acidogenic bacteria and methanogenic archaea. Acidogens are hardy and reproduce quickly; methanogens grow slowly and are sensitive to pH, temperature, and inhibitor concentrations. When feed conditions shift, for instance a shock load of high-strength industrial waste, acidogens race ahead and produce…
Why Return Liquor Deserves a Separate Procurement Line Return liquor from belt presses, centrifuges, and screw presses is the plant’s most concentrated internal recycle. It typically carries 800-1,800 mg/L ammonia nitrogen and 1,500-4,000 mg/L chemical oxygen demand—concentrations that overload analyzers specified for normal plant influent. When it flows back to the head of the works…
Why Digester Supernatant Is Not Ordinary Feed Water Digester supernatant is the clarified liquor drawn from the top of anaerobic digesters or from separate holding tanks. It looks reasonably clear to the eye, yet chemically and mechanically it is nothing like municipal drinking water. It carries elevated bicarbonate alkalinity, ammonia, orthophosphate, and low levels of…
Why the Digester Loop Is a Sensor Procurement Problem in Its Own Right Anaerobic digesters are the beating heart of resource-recovery-oriented wastewater plants, but their instrumentation is often treated as an afterthought in tenders that concentrate on tanks, mixers, and biogas engines. That is where cost overruns are born. Feed and recirculation lines carry sludge…
title: “Nutrient Recovery Economics for Utility Boards: A Shanghai ChiMay C-Suite Perspective on What to Ask Chief Engineers” date: 2026-07-17 perspective: C-Level / Decision Maker theme: Sludge, Anaerobic Digestion & Resource Recovery Nutrient Recovery Economics for Utility Boards: A Shanghai ChiMay C-Suite Perspective on What to Ask Chief Engineers The Short Version Nutrient recovery from…
