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pH Adjustment, Chlorination, Iron Augmentation  

 

pH Adjustment

Using Carbon Dioxide Gas

The AdEdge CO2 pH adjustment system is designed to lower the pH of the source water through the injection and dissolution of gaseous CO2.  The system is capable of dynamically controlling the pH of the water stream by actively monitoring the pH of the water downstream of the gas injection point and proportionately controlling the amount of CO2 injected, thereby achieving and maintaining a set point.  Depending upon the source water chemistry and flow rate, AdEdge CO2 systems are capable of consistently reducing pH significantly, and maintaining a setpoint to within 0.1 pH unit. 

AdEdge’s CO2 system is comprised of a pH controller and probe, a CO2 injector assembly, inlet/outlet solenoid valves, a pressure regulator, pressure gauges, pH control electronics, and central control panel.  A simple turn of a valve can change this automatic system into a manually operated system that can be controlled completely by the operator.  Since the CO2 system is self contained and requires no other integration with external components, it can be utilized with either an AdEdge Modular or Skid Mounted treatment system.  The CO2 system can be purchased separately or added to any treatment option if pH adjustment is required.

Using Sodium Hydroxide

The AdEdge Sodium Hydroxide (NaOH) pH adjustment module is designed to increase the pH of the source water through the injection of a 50% solution of NaOH.  A simple peristaltic pump delivers the appropriate solution strength through an injection point upstream of the treatment system.  The appropriate dosing calculations will be provided by AdEdge and based on the source water chemistry and flow rate.  The NaOH feed pump can be controlled through a switched outlet so that the chemical feed pump will be energized when the well pump is initiated.  If the chemical feed pump needs to be controlled based on a variable flow rate a PCM and flow meter combination can be used to regulate the injection of the NaOH.  Either method of control will consistently introduce NaOH into the water source to maintain a more optimized pH.

AdEdge’s NaOH module is comprised of a peristaltic metering pump, chemical feed/mixing tank, in-line static mixer, injector and associated tubing and fittings.  As mentioned above, if control of the injection is based on a variable flow, a PCM is available as an option to add onto the standard NaOH module.    As with AdEdge’s CO2 system, the NaOH module is self contained and requires no other integration with external components, it can be utilized with either an AdEdge Modular or Skid Mounted treatment system.  This module is a common adder to treatment systems where the pH is required to be increased for optimization of contaminant removal.

Using Hydrochloric Acid

An alternative option, to CO2, in order to decrease a waters pH is the utilization of hydrochloric acid (HCL).  If there is a lower flow rate and less automation required for pH control then, AdEdge’s HCL pH adjustment module can be a viable option.  The HCL pH adjustment module is designed to decrease the pH of the source water through the injection of a 36% solution of HCL.  Just as with other chemical feed modules, a simple peristaltic pump delivers the appropriate solution strength through an injection point upstream of the treatment system.  AdEdge will provide the proper dosing calculations based on the water chemistry and maximum flow rates of the well or demand.   The chemical feed pump can be controlled through a switched outlet so that the chemical feed pump will be energized when the well pump is initiated or through a PCM and flow meter combination if the chemical feed is required to be controlled by the flow rate. 

The HCL module consists of a peristaltic metering pump, chemical feed/mixing tank, in-line static mixer, injector and associated tubing and fittings.  If injection of the HCL is required to be based on the flow rate then a PCM (programmable control module) is available also.  The HCL module is self contained and requires no other integration with external components; it can be utilized with either an AdEdge Modular or Skid Mounted treatment system.  This module is a common adder to treatment systems where the pH is required to be decreased for optimization of contaminant removal. 

All pH adjustment modules have an optional monitoring module if desired.  A monitoring module allows the pH of the water to be monitored and displayed at all times for ultimate optimization of any pH adjustment.  A monitoring module includes a pH probe and housing and a digital display.  If integration with a PLC is desired, a transmitter can be included.   

Chlorination

Liquid Sodium Hypo-chlorite (Chlorine) is commonly used throughout the water treatment industry and has been time tested to be the most cost effective choice for distribution disinfection, used in 98% of municipal treatment facilities for deactivation of common microorganisms. Chlorine is also the preferred choice for oxidation within a treatment scheme, used primarily in a co-precipitation treatment process, where iron, arsenic and manganese are present.

The AdEdge system of chlorine injection is fairly straight forward and easily adaptable to most treatment processes.  Our basic modules typically consist of the following components;

Chemical Feed Pump (diaphragm or peristaltic)
Chemical Storage (day tank)
Injector Nozzle
Corporation Stop with Injection Quill

Value added components can be added to any chlorination module such as

Panel Mounted Continuous Free Chlorine Monitoring
Chlorine dosage based on throughput (flow)
Free standing or wall mounted pre-assembled injection skid
Calibration columns, pulsation dampeners and flow metering

Iron Augmentation

Ferric Chloride (FeCl3) is a widely used iron salt in the Water and Waste Water treatment industry primarily as a coagulant or flocculent.  When introduced into a treatment process, ferric chloride assists in the coagulation of various contaminants found in water supplies but is mainly used for the co-precipitation of Arsenic and Iron. Since iron and arsenic are naturally attracted to each other, the addition of ferric chloride is an ideal approach for arsenic removal, usually resulting in lower capital and operating costs over alternative technologies.

The process of ferric chloride injection is fairly straight forward and easily implemented.  Basic ferric chloride modules typically consist of the following components;

  • Chemical Feed Pump (diaphragm or peristaltic)
  • Chemical Storage (day tank)
  • Injector Nozzle
  • Corporation Stop with Injection Quill

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Carbon Dioxide Injection System

Chlorine Chemical Metering Pump