Groundwater ingress at the face, through the lining and from dewatering wells must be collected, treated and discharged within consent. Flow and quality vary continuously with geology, so the plant must tolerate a wide turndown.
Specialised water treatment for TBM slurry, groundwater and construction runoff on underground projects.
Dissolved air flotation for oil, grease and fine-solids removal from equipment washdown water.
Screw and belt presses producing stackable cake from excavated spoil and treatment sludge.
Here we set out how to treat variable groundwater inflow from the face, lining and dewatering wells — turbidity, iron and manganese, pH and oil — to a consented discharge. We show it because inflow quality and volume swing constantly with the geology, and the plant has to ride that turndown. Equalisation buffers the flow and load swings, ahead of clarification, iron and manganese removal and pH correction sized for the worst-case inflow. The result is a robust, automated train that holds the discharge within consent whether the face is dry or the machine has just hit a water-bearing fault.
Inflow swings from a trickle to several thousand cubic metres per day as the drive passes through different strata, demanding wide hydraulic turndown.
Fines mobilised by excavation and grouting raise turbidity well above discharge limits and must be removed reliably across the flow range.
Reducing groundwater can carry dissolved iron and manganese; contact with cementitious materials elevates pH. Both must be corrected before discharge.
Buffer and sediment tanks dampen flow surges and drop coarse grit, stabilising the load on downstream stages.
Inline coagulation followed by lamella clarification and media or self-cleaning filtration removes turbidity and precipitated metals to consent levels.
Aeration oxidises dissolved iron and manganese for removal, while acid or CO2 dosing neutralises alkaline construction water.
Compact inclined-plate clarifiers giving a large settling area in a small footprint for confined sites.
Continuous filtration for polishing turbidity and capturing oxidised metals ahead of discharge.
Coagulant, acid and oxidant dosing with automated pH and turbidity control for unattended operation.
Reynolds & Bauhm designs and deploys treatment and recovery packages matched to your geology, programme and discharge consent.
Our expertise spans multiple industries with sector-specific water treatment solutions.