Plating bath pH control, pickling acid neutralisation, rinse water pH adjustment, and anodizing bath management for metal finishing operations.
Electroplating bath pH, pickling acid neutralisation, anodizing electrolyte control, and effluent compliance for metal finishing operations.
Nickel, chrome, and zinc plating baths operate at tightly controlled pH. Sulphuric acid or caustic soda maintains bath chemistry; drag-out rinse water requires pH correction before treatment.
HCl and sulphuric acid pickling baths generate spent acid and rinse water at pH <2. Lime or caustic soda neutralisation raises pH to 6–9, precipitating dissolved metals simultaneously.
Sulphuric acid anodizing operates at pH ~1. Chromate conversion coatings need pH 1.5–2.5. pH control in seal tanks (pH 5.5–6.5) ensures coating quality and corrosion resistance.
Combined effluent from plating, pickling, and anodizing contains acids, alkalis, and dissolved metals. Two-stage neutralisation with metal precipitation at pH 8.5–9.0 is standard practice.
| Application | Target pH | Reagent | Notes |
|---|---|---|---|
| Nickel Plating | 3.8 – 4.5 | Sulphuric Acid / Boric | Chloride or sulphate bath |
| Chrome Plating | 1.0 – 2.0 | Sulphuric Acid | Chromic acid based |
| Zinc Plating | 4.0 – 5.5 | Acetic / Sulphuric Acid | Alkaline or acid bath |
| Pickling Rinse | 6.0 – 9.0 | Lime / Caustic Soda | Fe precipitation at pH 8–9 |
| Anodizing Bath | 1.0 – 2.0 | Sulphuric Acid | 180–200 g/L H2SO4 |
| Final Effluent | 6.0 – 9.0 | Acid or Alkali | Metal precip. at 8.5–9 |
Sulphuric and hydrochloric acid dosing for plating bath control and pickling rinse neutralisation.
Discover MoreLime and caustic soda dosing for spent acid neutralisation and metal hydroxide precipitation.
Discover MorePlating bath pH automation with redundant sensors, peristaltic pumps, and alarm interlocks.
Discover MoreCompact batch or continuous effluent pH correction with metal precipitation and sludge handling.
Discover MorepH correction is a critical stage in wastewater and process water treatment. Incorrect pH can damage downstream biological systems, corrode pipework, violate discharge consent limits, and compromise product quality. Our dosing systems utilise flow-proportional control with automated feedback loops to maintain target pH within ±0.2 units, regardless of influent variability.
Rapid mixing and reaction kinetics ensure complete neutralisation before downstream processes.
Flow-paced and feedback-controlled dosing eliminates chemical wastage and overshoot.
Systems account for influent buffer capacity to calculate precise reagent requirements.
Automated temperature compensation ensures accurate pH measurement across seasonal variations.
| Flow Range | 0.5 – 5,000 m³/h |
| pH Setpoint Range | 4.0 – 10.5 (adjustable) |
| Control Accuracy | ±0.2 pH units |
| Response Time | <30 seconds to setpoint |
| Reagent Concentration | 10% – 98% (application specific) |
| Materials | SS316L, PVC, PVDF, PTFE, rubber-lined steel |
| Control Philosophy | Flow-paced + cascade PID feedback |
| Communication | Modbus RTU/TCP, Ethernet/IP, OPC-UA |
Quality management systems ensuring consistent design, manufacture, and commissioning.
Explosion-proof dosing skids available for Zone 1 and Zone 2 hazardous area installations.
Systems engineered to meet local discharge consent limits including pH, metals, and COD.
Food-grade acid and alkali selection prevents taint and ensures compliance with food safety standards. Automated CIP integration available.
Validated dosing systems with full IQ/OQ documentation. Hygienic design prevents biofilm formation in pure water loops.
High-purity dosing for boiler feed water and cooling tower blowdown neutralisation. Redundant pump arrangements ensure availability.
Heavy-duty construction withstands aggressive mine water chemistry. Remote telemetry enables operation at unmanned sites.
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Illustrative scenarios showing how this equipment is configured for real-world applications.
Our expertise spans multiple industries with sector-specific water treatment solutions.