# EVOLV — Wastewater Treatment Plant Automation

> **Reflects code as of `9ab9f6b` · regenerated `2026-05-11`**
> Source of truth: `nodes/<name>/src/specificClass.js` `configure()` declarations. Edges below were verified against `router.onRegister(...)` calls and emitter subscriptions.

EVOLV is a Node-RED node library for wastewater plant automation, developed by Waterschap Brabantse Delta's R&D team. Nodes follow ISA-88 (S88). The library exposes **11 active nodes** across four S88 levels plus **1 utility node** for Grafana dashboard provisioning, all built on a shared `generalFunctions` library.

## Platform overview

```mermaid
flowchart TB
    subgraph PC["Process Cell"]
        ps[pumpingStation]:::pc
    end
    subgraph UN["Unit"]
        mgc[machineGroupControl]:::unit
        vgc[valveGroupControl]:::unit
        reactor[reactor]:::unit
        settler[settler]:::unit
        monster[monster]:::unit
    end
    subgraph EM["Equipment"]
        rm[rotatingMachine]:::equip
        v[valve]:::equip
        diff[diffuser]:::equip
    end
    subgraph CM["Control Module"]
        meas["measurement<br/><i>registers with any process node</i>"]:::ctrl
    end
    subgraph UT["Utility"]
        dash["dashboardAPI<br/><i>any node → Grafana dashboard</i>"]:::util
    end

    ps -->|owns| mgc
    ps -.->|direct child, no group| rm
    mgc -->|load-shares| rm
    vgc -->|positions| v
    settler -->|return pump| rm

    reactor ==stateChange==> settler
    diff -. OTR data .-> reactor

    classDef pc fill:#0c99d9,color:#fff
    classDef unit fill:#50a8d9,color:#000
    classDef equip fill:#86bbdd,color:#000
    classDef ctrl fill:#a9daee,color:#000
    classDef util fill:#dddddd,color:#000
```

**Edges in this diagram are ground-truth** — every solid arrow is a `router.onRegister(softwareType, …)` declaration in the parent's `configure()`. Dashed arrows are emitter subscriptions (not child registrations). For full data-flow including `measurement` fan-out to every process node and `valveGroupControl`'s flow-source registrations, see **[Topology-Patterns](Topology-Patterns)**.

## Live nodes

| S88 level | Node | One-liner | Per-node wiki |
|---|---|---|---|
| 🟦 Process Cell | **pumpingStation** | Wet-well basin model; dispatches demand to one or more pump groups. | [Home →](https://gitea.wbd-rd.nl/RnD/pumpingStation/wiki/Home) |
| 🔷 Unit | **machineGroupControl** | Load-sharing across a group of `rotatingMachine` children. | [Home →](https://gitea.wbd-rd.nl/RnD/machineGroupControl/wiki/Home) |
| 🔷 Unit | **valveGroupControl** | Coordinated position control across a group of `valve` children; can register pump/PS/MGC nodes as flow sources. | [Home →](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Home) |
| 🔷 Unit | **reactor** | Bioreactor — ASM kinetics (CSTR/PFR engines); pairs with diffuser + downstream settler. | [Home →](https://gitea.wbd-rd.nl/RnD/reactor/wiki/Home) |
| 🔷 Unit | **settler** | Secondary clarifier; subscribes to upstream reactor stateChange, drives a return-pump. | [Home →](https://gitea.wbd-rd.nl/RnD/settler/wiki/Home) |
| 🔷 Unit | **monster** | Composite-sample sensor surrogate / proportional sampling program. | [Home →](https://gitea.wbd-rd.nl/RnD/monster/wiki/Home) |
| 🟦 Equipment | **rotatingMachine** | Single pump / compressor — characteristic curves, prediction, FSM. | [Home →](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Home) |
| 🟦 Equipment | **valve** | Single valve actuator with FSM (shared with rotatingMachine state model). | [Home →](https://gitea.wbd-rd.nl/RnD/valve/wiki/Home) |
| 🟦 Equipment | **diffuser** | Aeration diffuser; gas-side modelling, OTR emission to reactor. | [Home →](https://gitea.wbd-rd.nl/RnD/diffuser/wiki/Home) |
| 🔹 Control Module | **measurement** | Sensor signal-conditioning, scaling, smoothing, outlier detection, analog/digital/MQTT. | [Home →](https://gitea.wbd-rd.nl/RnD/measurement/wiki/Home) |
| ⚪ Utility | **dashboardAPI** | Receives `child.register` for any process node → provisions Grafana dashboard via HTTP. | [Home →](https://gitea.wbd-rd.nl/RnD/dashboardAPI/wiki/Home) |
| — | **generalFunctions** | Shared library — `BaseDomain`, `BaseNodeAdapter`, `ChildRouter`, `commandRegistry`, `UnitPolicy`, `MeasurementContainer`, `statusBadge`, `HealthStatus`, `logger`, `configManager`. **Not a Node-RED node.** | [Home →](https://gitea.wbd-rd.nl/RnD/generalFunctions/wiki/Home) |

## Start here

| You want to… | Read |
|---|---|
| Stand up a local dev environment + run an example flow | [Getting-Started](Getting-Started) |
| Understand the codebase layout, BaseDomain/adapter pattern, output ports | [Architecture](Architecture) |
| See typical plant configurations and how nodes wire together | [Topology-Patterns](Topology-Patterns) |
| Know what topic names to use, units, S88 colours | [Topic-Conventions](Topic-Conventions) |
| Understand what Port 0 / Port 1 / Port 2 carry, InfluxDB layout | [Telemetry](Telemetry) |
| Decode S88 / EVOLV jargon | [Glossary](Glossary) |

## Domain concepts

Evergreen technical references (not affected by refactors):

| Page | Topic |
|---|---|
| [ASM models](concepts/asm-models) | Activated Sludge Models — biological process kinetics |
| [PID control theory](concepts/pid-control-theory) | Loop tuning, anti-windup, controller forms |
| [Pump affinity laws](concepts/pump-affinity-laws) | Speed/flow/head/power scaling |
| [Settling models](concepts/settling-models) | Takács / Vesilind / discrete settling |
| [Signal processing — sensors](concepts/signal-processing-sensors) | Smoothing, outlier rejection |
| [InfluxDB schema design](concepts/influxdb-schema-design) | Cardinality, tags vs fields |
| [Wastewater compliance NL](concepts/wastewater-compliance-nl) | Dutch regulatory context |
| [OT security — IEC 62443](concepts/ot-security-iec62443) | OT cybersecurity baseline |

## Operations findings

Algorithm-level proofs and behavioural notes that are still valid:

| Page | Topic |
|---|---|
| [BEP gravitation proof](findings/bep-gravitation-proof) | Best-efficiency-point convergence |
| [Curve non-convexity](findings/curve-non-convexity) | When pump curves break local optima |
| [NCog behaviour](findings/ncog-behavior) | NCog control metric notes |
| [Pump switching stability](findings/pump-switching-stability) | Hysteresis design for multi-pump groups |

## Project status

| Tier | What | Status |
|---|---|---|
| 1 | Add infra in `generalFunctions` (additive only) | ✅ done |
| 2 | Pilot: pumpingStation end-to-end on new infra | ✅ done |
| 3 | Convert measurement, MGC, rotatingMachine | ✅ done |
| 4 | Convert valve, VGC, reactor, settler, monster, diffuser, dashboardAPI | ✅ done |
| 5 | Canonical topic names + alias deprecation map | ✅ done |
| 6 | Promote `development` → `main` | ⏳ pending Docker E2E + human review |
| 8.5 | Remove deprecated paths in `generalFunctions` | ✅ done |
| 9 | Wiki refactor — visual-first per-node + master pages | ✅ landed 2026-05-11 |
| 10 | Test-suite refactor across all nodes | 🟡 in progress |
| — | pumpingStation Docker E2E (P2.14) | ⏳ pending |

823 platform tests pass · 0 failures · 12 submodules + parent on `development`.

## Archive

Pre-refactor planning pages have been moved to the [Archive](Archive). The current Home and supporting pages are the canonical references.