4×2500T High-Capacity Maize Grain Handling & Storage Facility — Rwanda — Eastern Province, Rwanda

Project Summary

The challenge: A leading Rwandan agricultural conglomerate, sourcing maize from a network of over 3,000 smallholder farmers across the Eastern Province, faced severe operational and financial strain during the critical February–May peak harvest season. Post-harvest losses consistently ranged between 12% and 15% annually, primarily driven by inadequate aeration in temporary storage structures and widespread pest infestation during the humid rainy seasons. These losses translated to an estimated 1,200–1,500 tonnes of maize wasted each year, directly eroding profit margins and undermining the client's ability to fulfill supply contracts with regional millers and export buyers. The intake bottleneck compounded the problem. With manual bag-loading operations achieving only 4–5 tonnes per hour, delivery trucks queued for 8–10 hours during peak harvest windows. This excessive wait time not only demoralized contracted farmers—many of whom diverted their harvests to competing buyers—but also created a dangerous backlog that forced the facility to turn away up to 30% of available supply during the narrow harvest window. Sun-drying on open concrete pads proved highly unreliable, producing maize with moisture content fluctuating between 14% and 18%, well above the 13.5% threshold required by regional millers. Loads exceeding this limit faced outright rejection or steep price penalties, further compressing margins and damaging the client's commercial reputation in the East African grain trade. The facility also lacked any integrated temperature monitoring or aeration infrastructure, meaning that even grain that made it into storage was at risk of hot-spot development, fungal growth, and mycotoxin contamination—particularly aflatoxin, which is strictly regulated by export markets in the Democratic Republic of Congo, Uganda, and Tanzania. Without a modern handling and drying system, the client was locked into a cycle of high losses, low throughput, and inconsistent product quality that threatened the long-term viability of their aggregation business.

Our solution: Manxing designed and delivered a fully turnkey 10,000-tonne maize grain handling and storage complex engineered specifically for the Eastern Province's tropical highland climate and the client's peak-season throughput demands. The facility centers on four FB-18.3 flat-bottom silo bins, each with a 2,500-tonne capacity, constructed from 275 g/m² hot-dip galvanized steel panels with a minimum zinc coating of 600 g/m², ensuring long-term corrosion resistance in the region's high-humidity environment. Each bin is equipped with a full aeration floor system, variable-frequency drive fans, and a multi-point temperature monitoring cable network that provides real-time grain condition data to the central control room, enabling operators to detect and address hot spots before spoilage occurs. To resolve the critical intake bottleneck, Manxing engineered a high-capacity receiving and cleaning circuit capable of processing 50–70 tonnes per hour directly from delivery trucks. The system incorporates heavy-duty vibrating screens, destoner units, and aspiration channels that clean incoming maize to ≤2% impurity content—removing chaff, broken kernels, dust, and foreign material before the grain enters the drying stage. Bucket elevators with 200-tonne-per-hour capacity and enclosed drag conveyors form the backbone of the internal material handling system, ensuring dust-free, low-damage transfer between receiving, cleaning, drying, and storage zones with minimal kernel breakage. The drying system is a 20-tonne-per-hour continuous-flow grain drying tower, engineered to reduce maize moisture content from an incoming range of 18% down to a uniform 13.5%—precisely meeting regional export and milling specifications. The tower operates on a counter-flow cooling principle that minimizes thermal stress on the grain, preserving germination integrity and milling quality. Automated moisture sensors at the dryer inlet and outlet continuously adjust burner output and grain retention time, ensuring consistent output moisture within ±0.3% even as incoming grain conditions fluctuate throughout the day. This eliminates the variability that previously caused load rejections. The entire facility is governed by an integrated PLC-based control system that links receiving, cleaning, drying, conveying, aeration, and temperature monitoring into a single operational dashboard. Operators can monitor bin fill levels, grain temperatures across multiple cable points, dryer throughput, and fan status in real time. The system also generates automated alerts for abnormal temperature rises, moisture deviations, or equipment faults, enabling proactive intervention. Manxing's engineering team provided full civil foundation design, structural steel detailing, mechanical and electrical installation, commissioning, and operator training, ensuring the client's local team could independently manage the facility from day one of operation.

The outcome: Since commissioning, the Manxing facility has fundamentally transformed the client's maize aggregation business. Post-harvest losses have been reduced from 12–15% to under 2%, recovering an estimated 1,000–1,300 tonnes of maize annually that was previously lost to spoilage, pests, and moisture damage. At current regional maize prices, this loss reduction alone represents a direct annual revenue recovery of approximately $250,000–$325,000, delivering a rapid return on the capital investment. Peak harvest intake capacity has surged from the previous 5–10 tonnes per hour to a sustained 60 tonnes per hour—a six- to twelve-fold increase—eliminating the 8–10 hour truck queues that previously plagued the facility. During the most recent harvest season, the facility received and processed over 8,500 tonnes within a single 45-day window, with average truck turnaround time reduced to under 20 minutes. This dramatic improvement in throughput reliability has strengthened farmer loyalty, with contracted smallholder deliveries increasing by 40% as growers no longer face the prospect of long waits or rejected loads. The continuous drying tower consistently produces maize at 13.5% moisture with ±0.3% uniformity, meeting the strict specifications of regional millers and export buyers. The client has successfully expanded its market reach, now exporting certified maize to the Democratic Republic of Congo, Uganda, and Tanzania with zero moisture-related rejections. The integrated aeration and temperature monitoring system has maintained grain quality throughout extended storage periods, with zero hot-spot incidents or mycotoxin detections recorded since commissioning. The client's market reputation has strengthened significantly, enabling them to command a 5–8% price premium over non-certified regional suppliers and secure long-term supply agreements with two major East African milling groups.

Project at a Glance

Equipment Provided

Grain Bins

Grain Dryers

Handling Equipment

Grain Cleaning & Grading

Aeration & Monitoring

Project Gallery

Project Timeline

Results

• ✓ Since commissioning, the Manxing facility has fundamentally transformed the client's maize aggregation business. Post-harvest losses have been reduced from 12–15% to under 2%, recovering an estimated 1,000–1,300 tonnes of maize annually that was previously lost to spoilage, pests, and moisture damage. At current regional maize prices, this loss reduction alone represents a direct annual revenue recovery of approximately $250,000–$325,000, delivering a rapid return on the capital investment. Peak harvest intake capacity has surged from the previous 5–10 tonnes per hour to a sustained 60 tonnes per hour—a six- to twelve-fold increase—eliminating the 8–10 hour truck queues that previously plagued the facility. During the most recent harvest season, the facility received and processed over 8,500 tonnes within a single 45-day window, with average truck turnaround time reduced to under 20 minutes. This dramatic improvement in throughput reliability has strengthened farmer loyalty, with contracted smallholder deliveries increasing by 40% as growers no longer face the prospect of long waits or rejected loads. The continuous drying tower consistently produces maize at 13.5% moisture with ±0.3% uniformity, meeting the strict specifications of regional millers and export buyers. The client has successfully expanded its market reach, now exporting certified maize to the Democratic Republic of Congo, Uganda, and Tanzania with zero moisture-related rejections. The integrated aeration and temperature monitoring system has maintained grain quality throughout extended storage periods, with zero hot-spot incidents or mycotoxin detections recorded since commissioning. The client's market reputation has strengthened significantly, enabling them to command a 5–8% price premium over non-certified regional suppliers and secure long-term supply agreements with two major East African milling groups.
• ✓ Delivered on schedule with full commissioning
• ✓ 10,000 tonnes total storage capacity

"ManXing's solution transformed our grain business. From 12% post-harvest losses to under 2%, from 8-hour queues to immediate offloading — the impact on our operations has been tremendous. The quality is consistent and our export customers trust us more than ever."

Managing Director — Rwandan Agricultural Conglomerate

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