Automated PFAS treatment controller with tamper-evident audit ledger and discharge interlock

PFAS compliance is entering a phase where "we treated the water" is no longer sufficient — regulators want proof, timestamped and tamper-evident, and they want a physical interlock that makes non-compliant discharge impossible rather than merely discouraged. This system patent covers exactly that layer: a computer-implemented controller that ingests multi-field water-quality data, applies a structured rule cascade to select the appropriate treatment train from a configurable library of at least eight options, actuates the downstream PLCs, reads back triple-method analytical instrument signals to compute a live fluoride closure ratio, and then either confirms compliant discharge or fires a hardware interlock that physically prevents it. The audit record is hash-chained, making any retroactive alteration detectable without specialized forensic equipment. The commercial case turns on regulatory force rather than technology preference. Water utilities and industrial dischargers facing EPA and state PFAS discharge limits cannot self-certify compliance with a generic SCADA log; they need an audit trail a regulator will accept and a physical gate that eliminates operator discretion at the moment of discharge. This system is designed to satisfy both requirements as an integrated unit. Paired with the underlying PFAS treatment method covered in the broader integrated packaging, storage and PFAS-treatment systems portfolio, it gives a strategic buyer both the routing logic and the enforcement apparatus — the method that determines what treatment to apply, and the machine that applies it, records the result, and locks the valve if the result falls short.

There is no chemical material to describe here; the invention is a control-system architecture. The core architecture is a closed-loop industrial controller built from processors and non-transitory memory. On the input side, the system accepts a 12-field data schema covering the water-quality and treatment-train parameters required to make a routing decision. The rule cascade evaluates those inputs and selects a treatment train from a configurable library of at least eight options, then issues commands to programmable logic controllers (PLCs) that actuate the physical treatment equipment. Once treatment runs, the system ingests readings from three independent analytical methods — ion chromatography (IC), combustion ion chromatography (combustion-IC), and fluorine-19 NMR — and combines them into a single closure ratio: the fraction of influent PFAS fluorine accounted for in the effluent measurement. This triple-method approach is deliberate; no single instrument covers the full PFAS spectrum with the fidelity a regulator would require, and the cross-method closure computation is what gives the ratio its evidentiary weight. Two architectural features carry the independent technical weight. First, the hash-chained tamper-evident ledger: sequential records are cryptographically linked so that any alteration — of a measurement, a decision, a timestamp — breaks the chain at the point of change and is detectable without external forensics. This is the trust layer that converts operational data into a regulatory audit trail. Second, the hardware halt-discharge interlock: when the computed closure ratio falls below 0.90, a physical actuator prevents discharge — not a software alert, a physical gate. A separate alerting band at 0.70 provides an early-warning signal before the hard interlock engages. A read-only audit endpoint exposes the ledger to external reviewers without providing any access to control functions, separating compliance verification from plant operation. The system's design artifacts include a formally specified selector rule cascade and a ledger format with defined hash-chain construction. The key performance threshold — the 0.90 closure ratio required to permit discharge — is embedded in the interlock logic, not left to operator configuration, which is precisely the design choice that gives the system its regulatory credibility.

The addressable market spans industrial process control and water treatment compliance, which we estimate in the $1–5 billion range. The primary buyers are water utilities operating under PFAS discharge permits and industrial dischargers — semiconductor fabs, airports with AFFF legacy contamination, chemical manufacturers — who face direct regulatory exposure for effluent quality. These buyers do not purchase control systems for their own sake; they purchase them because a failed audit or a discharge violation carries enforcement action, consent orders, and reputational cost that dwarfs the cost of a compliant controller. Licensing economics for this system differ from a process-method license. The natural unit is the installation: each treatment train brought under continuous compliance monitoring represents a recurring software-and-audit relationship. Per-installation licensing, per-controller-unit royalties, or embedded-software OEM fees are all viable structures depending on the channel. The recurring character of the relationship — the controller generates audit records continuously, and those records have ongoing regulatory value — supports subscription-style or annual maintenance fees layered on top of an upfront license. The strongest commercial packaging bundles this system with the underlying treatment method from the same portfolio, so the buyer acquires both the logic that determines what treatment to apply and the machine that applies it and enforces the result. That combined offering is harder to replicate and harder to design around than either piece alone.

auditable, tamper-evident, hardware-interlocked PFAS treatment controller

hardware discharge-interlock + hash-chain ledger = technical-improvement framing over abstract decision

The end customers are water utilities and industrial dischargers — semiconductor manufacturers, military installation operators managing AFFF legacy contamination, industrial chemical processors, and municipal utilities under PFAS discharge permits. These buyers are motivated by regulatory compulsion: the controller solves a compliance problem they cannot ignore, not a productivity problem they can defer. For them, the purchase decision is driven by whether the audit trail and interlock meet the evidentiary standard their regulator will accept, and a validated, patent-protected system offers that assurance more credibly than an internally built solution. The most strategically motivated acquirers, however, are the SCADA and PLC integration firms that currently serve these utilities. Adding a compliance-grade PFAS module — with a patented audit ledger and hardware interlock — to an existing platform converts a commodity integration offering into a defensible compliance product. The strongest transaction structure bundles this system with the paired treatment method from the same portfolio, giving the buyer both the routing logic and the enforcement apparatus in a single acquisition. Field-of-use licensing to a control-systems integrator, with the licensor retaining the underlying process method, is a clean alternative that preserves optionality on the chemistry side while monetizing the system layer immediately.

Patent eligibility is the dominant risk. The system's commercial value rests on maintaining a defensible patent, and computer-implemented systems face Alice challenges that prior-art searches do not reveal. The current framing — hardware interlock plus tamper-evident ledger as a concrete improvement to a physical apparatus — is the right architecture for step-two survival, but the full eligibility narrative tying the ledger and closure logic to the physical interlock needs to be completed before the application proceeds through examination. A buyer acquiring this asset before that narrative is locked is acquiring some of that drafting risk. Operationally, the rule cascade, PLC actuation, and hardware interlock remain unproven at production scale. The 0.90 closure-ratio threshold is embedded as a hard interlock, which means a miscalibrated instrument signal or a software error in the closure computation carries a direct regulatory consequence — either a false halt that stops compliant discharge, or a missed violation that permits non-compliant discharge. The 200-matrix deployment that constitutes the open proof gate is not merely a commercial milestone; it is also the test that demonstrates the interlock behaves correctly under operational variance. Additionally, the rule cascade is a structured ranking heuristic, not a measured treatment-efficacy demonstration — the system routes treatment trains, it does not certify that any given train achieves the claimed destruction efficiency. Claims and marketing must stay within that scope.