‘Our contract says no liquids,’ the operations manager said, ‘and the driver refused the bin anyway.’ She had the clause in front of her, highlighted. The driver had a different document, a different definition, and a tipper that had just been hosed down because of the last load he took from that site.
This is not a rare argument. Almost every food waste contract bans liquid, and almost none of them say what liquid means, where it is measured, or who decides. If you are solidifying waste to comply with a contract, the wording matters as much as the dose.
Four words that need a number
The first is ‘liquid’. A bin can be 30 percent water by weight and still pass a visual check, because the gel holds it in a matrix that looks like wet couscous. A bin can be 5 percent water by weight and fail, because the water has separated and pools under the load. Weight percentage and free liquid are different measures, and the contract usually means the second one without saying so.
The second is ‘free liquid’. The useful definition is the amount that runs out when the bin is tipped to a defined angle for a defined time. Ten degrees for thirty seconds is a common industry test, and it is the one most drivers apply in their heads when they look at a bin. Get that written into the schedule.
The third is ‘at the gate’. A bin that passes at your loading bay can fail at the weighbridge, because the truck has driven four miles and the load has consolidated. The contract needs to say where the test applies, or you will win the argument at your own door and lose it at theirs.
The fourth is ‘non-liquid’ as it applies to the compactor or the tipper. Many hauliers will accept a gelled load but not a load that drips during discharge, because the drip goes onto the tipping floor and then into a drain they are responsible for. That is a stricter standard than ‘no pooling’, and it is the one that actually gets loads rejected.
The test, the place, the person
Write the test as a procedure, not a principle. Bin on level ground, lid open, load at least half full, tip the bin ten degrees towards the hinge, hold for thirty seconds, observe. If liquid reaches the lip, the load fails. If it does not, it passes. Name the person who applies it: usually the site supervisor before the truck arrives, and the driver at the gate.
Then agree what happens on a fail. The options are re-dose and rebook, tip into a second bin, or accept a surcharge for a wet load. Whichever you choose, put the price in the contract. A $250 rejection fee that nobody negotiated is the most common cause of a five-year argument.
Weight, density and the per-tonne trap
If you are billed per tonne, solidification changes the invoice in two directions. It adds water weight, because the water that used to run away now stays in the bin. It also reduces the number of collections, because bins can be filled closer to capacity without leaking. Those effects can cancel out or they can compound, and you cannot know which without three months of tickets.
The clause to ask for is a weight allowance, or at minimum a density figure so both sides know what a full bin should weigh. A 240-litre bin of gelled food waste typically lands between 160 and 220 kilos. If your tickets show 260, something else is going in – usually wash water that should have gone to a drain, or a second dose that was not needed.
What to add to the schedule before you sign
Ask for four additions: the free-liquid test with an angle and a time, the location where it is applied, the name and role of the person who decides, and a fixed charge for a rejected load. Add a line that says gel-dosed loads are acceptable provided they pass that test, so that a new driver cannot impose a stricter standard on the day.
One site I worked with added a photograph appendix: three pictures of an acceptable load, one of a marginal load, one of a rejection. The rejection rate fell by two thirds in the first quarter, not because anything changed in the kitchen but because the driver and the supervisor were finally looking at the same thing.
If you are renegotiating, the solidification user guide includes the wording most hauliers will accept, which saves you drafting it from scratch.
Da maohua
Zhengzhou Flor New Materials Co., Ltd. specializes in SAP super‑absorbent polymer products. Serving personal hygiene, agriculture & horticulture, pet supplies and other industries, we leverage supply‑chain resources to provide particle‑size selection, performance matching and customized solutions based on clients’ practical requirements.
