Cleaning Up: Automated Wastewater pH Treatment System
Transforming non-compliant discharge at 3.3 pH into city-approved effluent in the 5.5–6.5 pH compliant range — fully automated, zero operator guesswork.
A small manufacturing plant discharged 20,000 to 40,000 gallons a day of wastewater at pH 3.3, below the 5.0 federal floor. The solution was a fully automated two-stage system: a 4,500-gallon Snyder holding tank in double containment, ProMinent radar and pH sensing, and PLC-controlled dosing. Effluent now lands in the compliant 5.5–6.5 pH range.
At a glance
| Process / fluid | Acidic wastewater inflow at 3.3 pH |
|---|---|
| Concentration | Acidic discharge at 3.3 pH treated to a municipal-compliant 5.5–6.5 pH range |
| Application | Fully automated two-stage industrial wastewater pH neutralization |
| Equipment | ProMinent metering pumps, radar level sensors, pH sensors and Dialog X PLC controller |
| Materials | Polyethylene chemical storage tanks with double-wall secondary containment |
| Operating conditions | Daily volume of 20,000–40,000 GPD |
| Problem | Wastewater at pH 3.3, below the 5.0 federal floor |
| Solution | 4,500-gallon Snyder holding tank in double containment, ProMinent radar and pH sensing, PLC-controlled dosing |
| Outcome | Effluent now lands in the compliant 5.5–6.5 pH range |
This system is a fully automated two-stage industrial wastewater pH neutralization solution designed to treat 20,000–40,000 gallons per day of acidic discharge (3.3 pH) and deliver consistent municipal-compliant effluent within the 5.5–6.5 pH range using closed-loop chemical dosing, continuous mechanical mixing, and PLC-controlled conditional discharge authorization.
Under federal pretreatment rules, discharging wastewater below a pH of 5.0 into a public sewer is prohibited unless the system is specifically designed to handle it.
Financial exposure: $1,000–$5,000+/day in municipal administrative penalties, up to $25,000/day in civil penalties
Inflow & Holding — The FOG Tank
The wastewater is initially diverted into a 4,500-gallon Snyder holding tank, designated as the FOG tank — Stage 1, the intake and buffer point for all corrosive inflow before any active treatment occurs. To mitigate the risk of vessel failure, the holding tank is placed within a double containment setup, ensuring that even in the event of a tank rupture or seal failure, no acidic material escapes to the environment or drainage system.
A ProMinent radar unit is installed on the tank to provide continuous, non-contact level monitoring — tracking the liquid level in real time and triggering the transfer pump automatically at a preset level of approximately 115 inches.
| Stage 1 — FOG Tank | Technical Reference |
|---|---|
| Vessel | 4,500-Gallon Snyder Holding Tank |
| Containment | Double-Wall Secondary Containment |
| Level Sensor | ProMinent Radar Unit (AP05) — Non-Contact |
| Transfer Trigger | ~115 inches → auto-activates transfer pump |
| pH Monitoring | ProMinent pH Sensor (AP00) — Inflow Measurement |
Key System Components
Metering pumps, radar level sensors, pH sensors, and the Dialog X PLC controller driving the automated 2-stage dosing sequence.
Industrial mixers providing chemical dispersion within the treatment vessels.
Electromagnetic flow meters providing real-time flow measurement for dosing control.
Dual 4,500-gallon polyethylene chemical storage tanks with double-wall secondary containment.
Wastewater pH Treatment FAQ
What pH range is required for municipal wastewater discharge?
Under federal pretreatment rules, discharging wastewater below a pH of 5.0 into a public sewer is prohibited unless the system is specifically designed to handle it. This system targets a 5.5–6.5 pH compliant range.
What happens if a facility discharges out-of-range wastewater?
Financial exposure ranges from $1,000–$5,000+ per day in municipal administrative penalties and up to $25,000/day in civil penalties.
What is the FOG tank in this system?
The FOG tank is a 4,500-gallon Snyder holding tank that serves as Stage 1 — the intake and buffer point for all corrosive inflow before any active treatment occurs, placed inside double-wall secondary containment.
How does the system know when to start treatment?
A ProMinent radar unit provides continuous, non-contact level monitoring on the holding tank, automatically triggering the transfer pump at a preset level of approximately 115 inches.
Don't leave your compliance to guesswork.
James Riggins — zero spec failures across 30+ years, 100+ projects
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated