Reference
Smart waste glossary
The terms that appear in specifications, tenders and supplier proposals, defined without the marketing.
Definitions of the terms used in smart waste management and sensor-led collection — fill-level sensors, radar versus ultrasonic measurement, NB-IoT, fill thresholds, dynamic round planning and the rest — written for people specifying or procuring these systems in the UK.
Fill-level sensor
A battery-powered device fitted inside the lid or top of a waste container that measures how full the container is and transmits the reading over a mobile network. Better units measure using radar; cheaper units use ultrasound. Alongside fill level they typically report temperature, GPS position, tilt, battery state and fault status.
Radar fill-level measurement
Fill-level measurement using millimetre-wave radar reflection. Radar is substantially more tolerant than ultrasound of irregular, absorbent and lightweight materials — flattened cardboard, paper and film plastic in particular — which makes it the appropriate technology for recycling containers. Vejle Municipality switched supplier to obtain radar after a non-radar trial produced error reports on up to 30% of readings.
Ultrasonic fill-level measurement
Fill-level measurement by timing a reflected sound pulse. Cheaper than radar and adequate against flat, hard, reflective surfaces, but prone to false readings against the soft and irregular materials that actually fill waste containers. The commonest cause of a smart waste pilot losing operational credibility.
NB-IoT
Narrowband Internet of Things: a low-power wide-area mobile standard carried over existing cellular infrastructure. It offers deep penetration — including below ground level and inside metal enclosures — very low power consumption, high operational reliability and scalability. It requires no infrastructure of your own, which distinguishes it from LoRaWAN and Sigfox.
LoRaWAN
A long-range, low-power radio protocol using unlicensed spectrum. Unlike NB-IoT it requires gateways you deploy and maintain yourself. Viable within a bounded estate such as a campus; less attractive for a dispersed council estate, where NB-IoT's use of national carrier infrastructure avoids building a network.
Fill threshold
The percentage at which a container is flagged for collection. Typically set between 80% and 90%. Vejle flags at 80%; Langeland normally adds a container to the route at 80–90%. Lower thresholds suit locations reached infrequently or with long drive times; higher thresholds suit containers you can reach the same day.
Dynamic round planning
Generating a collection round from current fill-level data rather than a fixed timetable, so that only containers at or approaching their threshold are visited. Vejle's round is calculated automatically at 05:00 each morning across 547 instrumented bins.
Fixed-frequency collection
The conventional model: every container on a round is emptied on a set schedule regardless of how full it is. Simple to plan and simple to contract, but wrong in both directions simultaneously — wasteful at quiet locations, inadequate at busy ones.
Emptying forecast
A prediction of when a specific container will reach its threshold, derived from its own fill history, current readings, driver reports and other data. Forecasts allow near-threshold containers to be collected while a vehicle is already in the area, rather than triggering a separate journey later.
Semi-buried container
A waste container with the majority of its volume below ground level, commonly up to three cubic metres. Popular at bring sites and in holiday areas for capacity and appearance. Its fill level cannot be assessed from ground level at all, which makes it one of the strongest cases for sensors. Fanø Municipality monitors 82 of them.
Bring site
An unstaffed public recycling point holding containers for several waste streams, often in a car park or at the edge of a settlement. Frequently a long drive from the depot, which is why a wasted journey to one is disproportionately expensive.
Waste fraction
A separately collected waste stream — residual, mixed recycling, glass, paper and card, food, textiles. Langeland handles ten fractions across its network, combining glass and metal into one to improve collection efficiency.
Lift
One emptying of one container. The standard unit of cost in a waste collection contract, and therefore the unit in which savings from sensor-led collection are usually expressed.
Side waste
Waste left beside a container rather than in it, normally because the container was full. A leading indicator of an under-served location and a direct cause of litter, pest and fly-tipping problems in the surrounding area.
Bin estate rationalisation
Reducing the number of containers by identifying, from fill history, those that overlap with others or are consistently under-used. Vejle began this once it had accurate location and fill data. Each container removed eliminates a lift, a sensor, a maintenance liability and a vandalism target permanently.
Baseline
The record of current cost, lifts, working hours and mileage taken before any change, against which a pilot's results are measured. Without one, a pilot produces impressions rather than a business case, and cannot support a procurement decision.
HWRC
Household Waste Recycling Centre — a staffed public site accepting bulky and separated household waste. Its containers are strong sensor candidates, because bulk container swaps are expensive and are typically scheduled rather than triggered by need.
Smart waste management
The general term for using sensors, connectivity and data to plan waste collection according to measured demand rather than a fixed schedule. In practice it means three components: fill-level measurement, a planning system that acts on it, and reporting that makes the outcome visible.
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