News Details

What Data Does an Urban Sewage Pipe Network Actually Need to Monitor?

Urban sewage pipe networks carry a complex mixture of domestic wastewater, industrial effluent, and in combined systems, stormwater runoff. Monitoring the quality and quantity of water flowing through this hidden infrastructure is essential for:•Identifying illegal industrial discharge into municipal sewers
•Controlling pollutant loads reaching the wastewater treatment plant
•Detecting overflow events before they reach rivers or coastal waters
•Supporting river chief and catchment management responsibilities
•Meeting regulatory discharge compliance requirementsUnlike surface water monitoring where sensors can be installed on riverbanks or buoys, sewer monitoring takes place in confined underground spaces — requiring purpose-built equipment that is explosion-proof, battery-powered, and capable of surviving the corrosive, high-humidity sewer environment.

Key Parameters Monitored in Urban Sewage Pipe Networks

1. pH

Why: Industrial discharge — from metal plating, food processing, chemical manufacturing, and textile dyeing — frequently causes pH excursions far outside the permitted range of 6–9. A sudden pH spike or drop in the sewer network is one of the fastest indicators of an illegal discharge event.

Typical range monitored: 0–14 pH

2. COD (Chemical Oxygen Demand)

Why: COD is the primary measure of organic pollution load in sewage. High COD entering the treatment plant from industrial discharge overwhelms biological treatment processes and increases operating costs. Real-time COD monitoring at key network nodes identifies which industrial zones or catchments are contributing excessive organic load.

Typical range monitored: 0.5–500 mg/L

3. Ammonia Nitrogen (NH₄⁺-N)

Why: Ammonia nitrogen from industrial food processing, livestock operations, and chemical facilities is both toxic to aquatic life and a major driver of eutrophication. Monitoring ammonia at drainage network nodes supports source tracing and enforcement action against high-strength industrial dischargers.

Typical range monitored: 0–1,000 mg/L

4. Turbidity / Suspended Solids

Why: Sediment-laden discharge — from construction sites, quarries, and industrial washdowns — causes rapid siltation in downstream pipes and at treatment plant headworks. Turbidity monitoring detects these events in real time and supports enforcement against sites discharging without adequate sediment control.

Typical range monitored: 0–400 NTU

5. Liquid Level and Flow

Why: Knowing how much water is flowing through each pipe section is as important as knowing its quality. Flow and level data enables calculation of pollutant mass loads (concentration × flow rate), identification of infiltration and inflow, and early warning of blockage or surcharge conditions that precede overflow events.

Typical range monitored: 0–10 m water level; flow derived from level and pipe geometry

6. Oil in Water

Why: Fats, oils, and grease (FOG) from food service, vehicle workshops, and light industrial premises are a major cause of sewer blockages and are strictly regulated in most jurisdictions. UV fluorescence oil-in-water sensors detect FOG discharge events that would otherwise go unnoticed until a blockage or overflow occurs.

Typical range monitored: 0–100 ppm

Summary — Sewage Network Monitoring Parameters

Recommended Solution: Kainafu KNF-400D

The KNF-400D is Kainafu's purpose-built sewage well drainage monitoring system — designed specifically for deployment inside manholes and inspection chambers, where conventional water quality monitoring equipment cannot operate.

Why the KNF-400D Is Different

Most water quality monitoring systems are built for surface or pipeline installation. The KNF-400D is engineered from the ground up for the manhole environment:

15-Minute Wall-Mount Installation
Mounts directly onto the interior wall of any standard manhole — no excavation, no pipe cutting, no civil works. One person can complete installation in approximately 15 minutes.

 Explosion-Proof Certified
Sewage manholes contain methane (CH₄) and hydrogen sulfide (H₂S) — classified hazardous atmospheres. The KNF-400D carries full explosion-proof certification, making it safe for deployment where uncertified equipment is prohibited.

48,000 mAh Built-In Battery
Most manholes have no mains power. The KNF-400D's large-capacity lithium polymer battery supports extended autonomous operation — with optional external DC 12V supply for sites where power is available.

4G Wireless Cloud Connectivity
All data uploads automatically to the Kainafu cloud platform via 4G — no surface cable runs, no local data loggers, no site visits required to retrieve data. Configure alarms, view trends, and export compliance reports remotely via web browser, mobile APP, or WeChat.

Optional Auto-Cleaning Device
High-fouling sewer environments rapidly coat sensor surfaces with grease, biofilm, and particulates. The optional automatic cleaning device extends sensor service life and maintains measurement accuracy between the recommended 6-month maintenance visits.

About Kainafu

Shenzhen Kainafu Technology Co., Ltd. is an R&D manufacturer of water quality sensors and monitoring systems — not a trading company. We design, manufacture, and calibrate every product in our Shenzhen facility, holding ISO 9001, ISO 14001, and CMA certifications across a product range of 50+ sensor types.

The KNF-400D is one of three major product series we manufacture — alongside the KNF-100 individual sensor series and the KNF-800 biological toxicity warning system — all supported by our own cloud monitoring platform and factory-direct technical service.