QINFENG Custom FIBC manufacturer since 2001
Water Treatment & Environmental Remediation Application brief
Dewatering industrial sludge and sediment in geotextile bags: water has to leave, solids have to stay, and the bag is sized by flow and solids content rather than by a lift weight.
Water-treatment contractors, dredging and lagoon-cleaning companies, industrial plants with settling ponds, and environmental remediation contractors. The buyer is usually a project engineer who has a solids content figure, a target discharge water quality and a limited site area.
Industrial Sludge and other dry bulk solids, typically 0.8–1.6 t/m³.
Handling chain
The bag is usually laid on a prepared, sometimes lined, drainage area and filled by pump over hours or days. Once drained, it is lifted by plant or crane and moved to a drying or disposal area. Discharge is normally the whole bag - the bag and its contents leave the site together.
Filled on automated spouts or semi-manual toll lines. High-speed de-aeration shapes the square footprint before the bag leaves the fill station.
Stacked two to three tiers high in transit warehouses. A baffle construction that does not bulge keeps the stack square instead of leaning into the aisle.
Lifted three to five separate times by port stevedores. Reinforced loop anchoring and cross-corner loops resist fork abrasion and tine punctures.
Has to fit inside the container wall, at roughly 2,350 mm internal width. A square footprint uses the cube without the bag dragging on the wall.
What fails in this chain
The controlling risk is dewatering performance: fabric opening size and permeability have to match the solids in the stream, or the bag blinds over and stops draining. Fines escaping with the water are a discharge-quality problem, not a bag-strength problem. Because the bag is filled by pump, its weight is not known until it is full, so the supporting area and lifting plan have to assume a heavy, wet, variable load. Outdoor exposure for weeks to months makes UV stabilisation essential, and the bag has to survive being dragged once it is solid.
Hazard: A standard tubular bag rounds out as it fills, wasting container volume and leaning in a warehouse stack.
QINFENG defense: Internal perforated ultrasonic baffles hold a square profile after fill, which is what makes three-high stacking in a shed predictable.
Hazard: Repeated lifting by rough tines tears side seams or frays loop attachment bases at transhipment hubs.
QINFENG defense: Heavier coated fabric with reinforced corner perimeter wraps and extra loop reinforcement backing, specified from the number of relifts.
Hazard: Faded printing or a torn document pouch causes customs delays and rejected cargo at the destination port.
QINFENG defense: Flexographic printing with UV-cured inks and a reinforced document pocket sewn onto the body seam, agreed before production.
Hazard: Unsheltered storage while awaiting vessel arrival degrades untreated polypropylene yarn within weeks.
QINFENG defense: UV-stabilised masterbatch in the tape, selected for how long the consignment actually waits on the quay rather than for the total storage period.
What we would quote
Tell us the solids content, the particle size range and the flow rate, and the fabric is chosen from those - not from a bag size. If the site has limited area, the plan is usually more bags at a smaller diameter rather than fewer large ones. Where the drained water goes back to a treatment plant, agree the expected discharge quality before the bags are ordered, because that is what the fabric selection is really balancing.
Before we can quote
Bag dimensions, baffle spacing and the safety margin all follow from these. Answer the ones you can and leave the rest; the missing details can be settled with our engineers.
Percentage solids and the particle size range in the sludge, which decide the fabric opening size.
How fast the material is pumped in, and whether filling runs continuously or in shifts.
What the drained water has to meet before it goes back to the plant or to treatment.
The prepared area available, the surface it sits on, and whether a liner is used underneath.
How the drained bag is lifted and where it goes, since the bag leaves with its contents.
How many weeks or months the bag sits outside before removal.
This page covers geotextile dewatering bags for sludge and sediment. It does not design the containment area, does not set discharge consent limits, and does not replace the customer's own permit and water-quality obligations. Performance is confirmed per project against the customer's material.
Talk to the applications team
We will come back with the construction we would build, the safety factor it carries and the dimensions that fit your loading plan — with drawings and a prototype before any bulk run.