Last week, our community delved into several insightful discussions focused on both emerging technologies and practical challenges in environmental engineering. Members shared experiences on integrating real-time control systems for air and water quality, highlighting both the potential benefits and technical hurdles. There was also a lively discussion about the often-overlooked role of different microbes in ocean oxygen production, which broadened our understanding of marine ecosystems. Additionally, practical tips for preparing stormwater logs for audits under the MSGP were exchanged, offering real-world solutions for compliance issues.
This Week’s Hot Topics
Integrating real-time air and water controls
This discussion centers around the implementation of real-time monitoring systems, which are becoming crucial for enhancing environmental compliance and operational efficiency. Members are exchanging ideas on overcoming technical barriers and sharing successful case studies.
Which microbe makes the most ocean oxygen
A fascinating thread that challenges common assumptions about marine oxygen production. Participants are exploring the diverse roles of oceanic microbes and their impact on global oxygen levels, sparking both scientific and practical interest.
Getting stormwater logs audit-ready under MSGP
This practical discussion is all about ensuring your stormwater logs meet regulatory requirements. Members are sharing strategies and tools to streamline the audit process, which is invaluable for maintaining compliance without the stress.
Thanks for staying engaged and contributing to our discussions. Your insights and experiences drive the community forward. Looking forward to another productive week.
I’ve had better luck with real-time DO control after adding a simple 15‑minute rolling median and a “don’t chase noise” deadband tied to routine drift checks. It cut valve cycling by about 40% and made alarms useful, but if you’re watching storm pulses or short algal blooms, trim that window so you don’t smooth away the signal. I also flag any >[redacted]/L step change as likely fouling before treating it as biology, which keeps the microbes‑oxygen narrative grounded.
Instead of chasing DO, we run a 3‑min “air‑off” test every hour to estimate OUR and then set blower output feed‑forward; it lets the microbes tell us the load and cut swings more than filtering alone, though you’ll need trustworthy airflow data and a safe DO floor for cold snaps. @t_wilson89 your deadband idea pairs nicely — OUR drives the target, deadband keeps actuators sane.
One tweak that paid off for us: use the online NH4 probe to drive DO setpoints (ABAC) instead of throttling strictly on DO — real-time but calmer. We hold about [redacted]/L NH4 at the end of aeration and let the controller float DO between 0.5–[redacted]/L; that cut blower kWh about 10% and reduced valve chatter compared to pure DO loops. Small caveat: the ISE drifts, so a quick weekly ionic strength check and 2‑point cal is non‑negotiable, @Guide.
Agree with @dbrooks3: “to pure DO loops. Small caveat: the ISE drifts, so a quick weekly ionic strength check and 2‑point cal” — we backstop it with ORP; when the ORP knee shows up we limit blower ramp to 5%/min and taper air for 90 s, which steadied DO and trimmed kWh. Small caveat: ORP needs a quick weekly wipe to avoid false knees; anyone else using ORP this way?
We’ve had good results using a small feed‑forward on influent flow: when Q spikes, we “rate‑limit” the DO setpoint upward over about 15 minutes instead of waiting for DO to dip, which cuts blower hunting. It depends on a stable flow signal, so we clamp the ramp if the meter glitches; @dbrooks3’s ORP backstop pairs nicely with it.
We switched to ammonium‑based aeration control: an online NH4 reading nudges the DO setpoint up or down while the PID trims air, which cut blower hours about 12% and kept nitrite blips rare. Caveat: the NH4 analyzer lags in cold starts, so we keep a minimum DO and add a small temperature bias. @Guide the key was a slow NH4 target with a faster inner DO loop — “let ammonia drive the air” without whipsawing the blowers.