Zhongsheng Environmental automatic chemical dosing systems provide precise, PLC-controlled injection of coagulants, flocculants, pH adjusters, and specialty chemicals for water and wastewater treatment. Skid-mounted, pre-wired, and factory-tested for rapid installation.
Accurate chemical dosing is critical to every water and wastewater treatment process — from coagulation and flocculation through pH correction, disinfection, and scale inhibition. Zhongsheng Environmental automatic dosing systems integrate solution preparation tanks, precision metering pumps, in-line mixers, safety devices, and PLC-based controls on a single pre-assembled skid. Each system is factory-wired, piped, and tested so it can be connected to your process within hours of delivery, eliminating field-fabrication errors and reducing commissioning time.
Dry or liquid chemical stock is loaded into the solution preparation tank, where a motorized agitator dissolves and homogenizes the reagent to the target concentration. The PLC continuously reads the process signal (e.g., pH, ORP, residual chlorine, or flow rate) from in-line analysers and calculates the required dose. It then drives one or more metering pumps to inject the prepared solution into the process stream through an injection quill and static mixer. A pulsation dampener smooths pump output, and a back-pressure valve ensures consistent injection pressure regardless of process-line fluctuations. When the tank level drops below a configurable setpoint, the system triggers an alarm and optionally locks out the pump to prevent dry running. All operating parameters — dose rate, tank level, pump status, and alarms — are displayed on the HMI touchscreen and can be transmitted to a central SCADA system via Modbus or Ethernet.
| System Type | Typical Chemical | Tank Material | Pump Type |
|---|---|---|---|
| PAC Dosing (Coagulant) | Poly-aluminium chloride / Ferric chloride | PE / PP / Rubber-lined CS | Mechanical diaphragm / Plunger |
| PAM Dosing (Flocculant) | Polyacrylamide (anionic / cationic) | PE / PP / PVC | Mechanical diaphragm / Screw |
| Acid / Alkali pH Adjustment | HCl, H₂SO₄, NaOH, Ca(OH)₂ | PE / PP / Rubber-lined CS | Hydraulic diaphragm / Plunger |
| Phosphate Dosing | Trisodium phosphate / HEDP | SS304 / SS316L | Mechanical diaphragm |
| Hydrazine / Ammonia Dosing | Hydrazine / Ammonia solution | SS304 / SS316L | Hydraulic diaphragm |
| Cooling Water Treatment | Corrosion inhibitor / Antiscalant | PE / PP | Mechanical diaphragm |
| Fully Automatic 3-in-1 | Multi-chemical integrated | Per chemical | Mech. diaphragm / Pneumatic diaphragm / Screw |
| Parameter | Range |
|---|---|
| Solution Tank Capacity | 50 – 5,000 L (custom up to 20,000 L) |
| Metering Pump Flow Range | 1 – 2,000 L/h |
| Maximum Discharge Pressure | Up to 2.5 MPa (25 bar) |
| Dosing Accuracy | ± 1% (steady state) |
| Agitator Speed | 30 – 120 RPM (variable frequency available) |
| Power Supply | 380V / 50Hz / 3-phase or 220V / 50Hz single-phase |
| Control System | Siemens / Mitsubishi PLC with HMI; Modbus RTU / TCP output |
| Ambient Temperature | -10 °C to +45 °C (heated enclosure option for cold climates) |
| Protection Rating | IP54 control panel (IP65 available) |
| Compliance | CE marking; designed per EU Machinery Directive 2006/42/EC |
Zhongsheng Environmental has supplied over a thousand dosing installations across power, petrochemical, municipal, and manufacturing sectors. Every system is custom-configured: we select pump technology, wetted materials, tank size, and control logic to match your specific chemical, flow rate, and process-control strategy. Pre-assembled, factory-tested skids arrive ready to connect — reducing your installation time, ensuring first-dose accuracy, and giving your operations team a single vendor to call for pumps, parts, and process support.
PAC (coagulant), PAM (flocculant), acid/alkali for pH adjustment, sodium hypochlorite, phosphate salts, corrosion inhibitors, and non-standard reagents.
Mechanical diaphragm, hydraulic diaphragm, and plunger pumps — selected based on chemical viscosity, flow rate, and pressure requirements.
Yes, PLC-based closed-loop control with 4–20 mA input from pH, ORP, turbidity, or flow instruments for proportional dosing.
PE, PP, PVC for standard chemicals; SS304/316L for aggressive reagents; rubber-lined carbon steel for large volumes.
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