Circular economy · waste to value

Mango waste to livestock feed processing systems

A second product from the same fruit.

Fruit processing discards roughly 40% of delivered fruit as peel and seed, which spoils within hours in Sahelian heat. Dried and pelletised, that waste becomes a shelf-stable livestock feed — a second saleable product from the incoming fruit you already pay to process.

One fruit, one heat plant, two products — the ~40% that would be waste becomes feed

Mango waste to pelletised feed — the full densification line

Why the economics work here

The classic objection to drying fruit waste is that the drying fuel costs more than the feed is worth. That objection is removed when the biomass burner already makes low-cost heat and the feed line runs in the same season, while the plant is already lit.

A documented caution. A Venezuelan mango-waste feed plant abandoned its dryer because, even with cheap fuel oil, drying cost exceeded feed value. The lesson is that the economics live or die on the cost of heat — exactly the condition our near-free cashew-shell heat satisfies.

Mass balance — a 5 t/day line

The controlling fact is water: of 5,000 kg wet waste, ~4,000 kg is water and only ~1,000 kg is dry solid. Water is removed in the cheapest order — mechanically first, then thermally.

Stream	Mass (kg/day)	Moisture	Water removed
Wet waste in	5,000	80%	—
After screw press	3,571	72%	1,429 kg (mechanical)
After drying	1,136	12%	2,435 kg (thermal)
Finished pellet feed	1,136	12%	≈114 kg/h

Mango does not press like citrus — peel presses poorly, so the 72% press figure is treated as optimistic and the dryer is sized with margin for a wetter feed.

Process flow

01
Reception & sorting
Tip, remove contaminants/stones, magnet-protect downstream
02
Shredding
Reduce to uniform particle for pressing & drying
03
Dewatering
Screw press squeezes out free water — the cheapest to remove
04
Drying (GreenMach)
Biomass-heated rotary dryer, 72% → 12%
05
Grinding
Hammer mill to consistent meal
06
Mixing / conditioning
Blend (± binder/minerals), condition to pelletising moisture
07
Pelletising
Ring-die pellet mill to chosen diameter
08
Cooling
Counter-flow cooler sets final moisture
09
Bagging
Weigh & bag (25–50 kg sacks)

Where we draw the line. GreenMach supplies the biomass burner, heat and the dryer; the mechanical densification machines (shredder, screw press, hammer mill, ring-die pellet mill, cooler, bagging) come from a specialist feed-equipment OEM. The dryer appears to the OEM only as an input and an output — keeping our core heat and drying technology out of supplier view.

The GreenMach waste-drying system

Our supplied stage is a complete, factory-assembled thermal drying system — material size reduction, conveying, cashew-shell burner, rotary drying chamber, emissions control and electrical controls, as one integrated package.

Parameter	Value
Feed material	Mango processing waste (peel & pulp trimmings), stone-separated
Feed capacity	500 kg/h nominal (±50)
Inlet → outlet moisture	80% → 15% w.b. (±1%)
Output capacity	~120 kg/h
Drying method	Direct hot-air, paddle-agitated rotary drum, co-current
Heat source	Cashew-shell biomass burner, 400,000 kcal/h nominal
Emissions control	Cyclone separation + counter-current wet scrubber
Connected power	~71.5 kW (dryer line)
Warranty	12 months from commissioning

Note: for animal feed the rotary dryer uses direct hot-air. Our food-grade lines use indirect heat so combustion products never contact the product — see Hot-Air Generators.

Explore further

Mango drying — the food line whose peel and trim feed this waste stream.
Agricultural-waste systems — multi-fuel burners and briquetting for crop residue.
Bobo-Dioulasso configuration — six panel rooms plus a waste-to-feed unit on one heat plant.
Waste-reduction context: FAO Food Loss & Waste Platform ↗

Frequently asked questions

Can processing waste really become a saleable feed input?

Mango peel and stone, cassava peel, brewers grain and oilseed cake all dry into feed ingredients, and drying is what makes them storable instead of a disposal cost. A 1,500 kg chamber load of wet peel is a real quantity to move, so the economics turn on volume and on having a buyer before you build. Treat it as a second product line with its own market, not as free money attached to the first.

Does feed drying need the same hygiene standard as food drying?

Not the same standard, but not none either — mycotoxin risk in stored feed is real and it starts with incomplete drying. The construction is identical because it is the same equipment: SS304 trays and wagons, and a chamber that holds 40 to 100 °C. What changes is the cleaning regime between products and how strictly you separate the two flows.

Can feed drying share a line with the food product?

Yes, and it is usually the point. Feed tolerates a wider parameter window than export-grade food, so it fills chamber hours between harvest peaks that would otherwise be idle. Run food first and feed after within a cleaning cycle, never the reverse, and keep the two on separate recipes in the Delta PLC — the same chamber, the same 40 to 100 °C envelope, two stored profiles.

Turn your fruit waste into feed

Tell us your daily waste volume and we’ll size the drying and heat plant — and scope the densification line with our feed-equipment partner.

Discuss a feed line