Paid by weight

A bottle can leave a household in several ways: with a municipal collection, through a community waste bank, or with someone who buys or gathers saleable material and takes it to a scrap shop.

Those are different transactions, even when they eventually feed the same recycling trade. The person collecting, the shop buying and the plant processing are not one interchangeable institution.

The collector matters. So does describing the work accurately enough to see where its risks and rewards sit.

More than one kind of collector

SEI’s 2021 Bangkok report distinguishes street waste pickers from itinerant buyers, described as saleng, and people doing both. Participants used several forms of transport, including tricycles, vehicles and walking. A motorcycle sidecar is not a definition of the whole workforce.

Researchers interviewed 34 workers in Bang Kapi and Khlong Toei in 2020, using purposive sampling. This was not a representative survey of Thailand. Twenty-eight participants reported working seven days a week.

The report describes repeat scrap-shop buyers and, for some workers, access to carts or credit. That is more informative than calling every collector independent of every business. Independence, dependence and employment are not established simply by looking at the vehicle.

What the headcount can tell us

An estimate of 1.5 million informal waste workers appears in SEI’s 2022 household-waste report. It is attributed to Trash Lucky material presented at a 2022 workshop, not SEI’s own enumeration.

This article does not have a reproducible national headcount or a measured national share of recycling attributable to these workers. It uses neither that estimate nor a regional percentage as proof that one group delivers almost all Thai recycling.

SEI’s account places households, municipal services, collectors, shops and processors within a connected system. Recognising informal work does not require writing everyone else out of it.

A national waste total is not a payroll

The Pollution Control Department reports 27.20 million tonnes of municipal solid waste generated in 2024. It records 10.51 million tonnes, or 39%, brought back into use through its recovery categories.

That material-flow account does not count collectors, identify employment arrangements or assign the recovered tonnage to one occupation. A broad recovery category should not be relabelled as plastic recycling.

The World Bank’s 2022 report presents a different measure. Its conclusions label 88.8% a combined formal collection-and-recycling rate across the studied areas. Collection and recycling are separate routes in that description; adding them does not make the sum a recycling rate. The study areas are not the whole country.

A figure needs its material, place, period and definition attached. Remove those and an apparently precise percentage can answer a question nobody actually measured.

What the buyer pays

Selling material by weight means the quantity and the buyer’s applicable rate both affect the proceeds. Grade, condition, deductions and transport terms matter to a comparison.

Buying-price lists do exist. Wongpanit publishes dated quotes by material and grade, with conditions and temporary suspensions. A posted rate establishes an offer to examine, not the price every shop pays or a particular collector’s net income.

Article 104 Weighed, not counted describes the related waste-bank transaction: material is valued and a balance recorded under local rules. Neither a public quote nor a passbook, by itself, demonstrates fair dealing or an improvement in workers’ earnings.

Health evidence needs an occupational boundary

A 2021 peer-reviewed study measured lead in blood and urine among informal electronic-waste recyclers, including participants from four selected villages in north-eastern Thailand. It examined tasks and exposure using a cross-sectional design.

That is evidence about the sampled e-waste work. It is not a national illness survey, a finding about every street collector, or proof that collecting cardboard produces the same exposure as dismantling electronics.

SEI’s Bangkok interviews likewise describe differing use of protective equipment, not universal absence. Equipment and occupational-health arrangements need checking for the actual task. A promise that a cheap pair of gloves or a respirator resolves the problem goes beyond these studies.

Informal does not mean outside every system

Self-employment is not automatic exclusion from all social security. The Social Security Office describes Section 40 as a voluntary contributory route for eligible informal and self-employed workers outside Sections 33 and 39.

Its existence does not establish that a particular collector qualifies, has enrolled or receives adequate protection. It does disprove the blanket claim that the occupation sits outside social security by definition.

Employment rights and safety duties also require the relevant working relationship and rule. This article does not determine a worker’s legal status from the word saleng.

What would make an improvement measurable

For prices, compare like material on like terms. For working conditions, establish the task and the actual arrangements. For a proposed service, measure its cost and what changes for participants.

An import restriction is a separate question from its effect on domestic scrap prices. Establishing that effect needs comparable prices, grades, demand and other market conditions. The sources used here do not quantify an import-driven change in collectors’ net earnings.

To arrange household recycling, ask the building, collector or receiving scheme what it accepts and how it wants material presented. SEI’s participants identified separation at source as useful. That supports asking and sorting appropriately, not leaving material anywhere beside a bin or guaranteeing that each preparation step raises income.

The work is worth seeing clearly. A stronger argument begins with the transaction and the evidence, not a larger unsupported number.

Common misconceptions

“All collectors are saleng on motorcycle sidecars.” The Bangkok research distinguishes buyers, street pickers and mixed roles, using different transport.

“The 1.5-million figure is a national census.” The 2022 SEI report attributes an estimate to workshop material; it is not SEI’s workforce enumeration.

“Thailand recycles 88.8% of its waste.” The World Bank labels that a combined measure for the studied areas, not a national recycling rate.

“Informal workers cannot enter social security.” Section 40 provides a voluntary route subject to eligibility. Availability and actual coverage are different questions.