PLC Control Hypochlorite Generator For Online Waste Water Plant Disinfection

Online Waste Water Plant disinfection Sodium Hypochlorite Generator with PLC control

Introduction:

Geemblue has developed a compact electrolysis system for generation of sodium hypochlorite for disinfection of tap water, waste water and food & beverage process for use in industrial purposes. Geemblue series sodium hypochlorite generator produces food grade standard sodium hypochlorite solution.

The unit is produced in China with technology based on more than 30 years of experience of brine electrolysis. This results in a compact fully integrated unit where safety and reliability comes first. Geemblue series sodium hypochlorite generator include electrolytic cell, internal water softener, salt saturator as well as dosing pumps. The unit complies with requirements and safety regulations regarding storage of products containing sodium hypochlorite, thus making a separate room for storage unnecessary. Note that this product does NOT contain chlorine gas and the electrolysis do not generate wastewater and do not require cooling/heating.

Operating Principle

In the Electrolyser, current is passed through the anode and cathode in the salt solution, which is a good conductor of electricity, thus electrolysing the sodium chloride solution.

This results in chlorine (Cl2) gas being produced at the anode, while sodium hydroxide (NaOH) and hydrogen (H2) gas is produced at the cathode.

The reactions that take place in the electrolytic cell is:

2 NaCl + 2 H2O = 2 NaOH + Cl2 + H2

The chlorine further reacts with the hydroxide to form sodium hypochlorite (NaOCl). This reaction can be simplified in the following manner:

Cl2 + 2 NaOh = NaCl + NaClO + H2O

The solution generated has a pH value between 8 and 8.5, and a maximum equivalent chlorine concentration of less than 8 g/l. It has a very long shelf life which makes it suitable for storage.

After dosing the solution into the water flow, no pH value correction is necessary, as is often required in sodium hypochlorite produced by the membrane method. The sodium hypochlorite solution reacts in a balance reaction, resulting in hypochlorous acid:

NaClO + H2O = NaOH + HClO

To produce 1kg equivalent of chlorine using on-site Sodium Hypochlorite generator, 3.5 kg of salt and 4 kilowatt hours of electricity is required. The final solution consists of approximately 0.8% (8 grams/liter) sodium hypochlorite.

Benefit of Geemblue EC system

High Safety Level

Food grade standard solution, multi-protection for each components, multi-protection for hydrogen exhaust

Low Running Cost

To produce 1 kg available chlorine, only cost 3.5kg salt, 4kwh power

Full Automatic Operation

Full computer program and central control by PLC, the staff can operate after simple training

Accuracy Control Dosing

Closed loop control system, ensure accuracy residual chlorine in water and make use of every drop of solution

Applications

Water plant

Chlorination before water filtration and after water filtration

Waste water plant

Chlorination after waste water treatment

Swimming pool

Circulation water chlorination

Food&beverage

Process water disinfection

Specifications

System Flow Chart

Water Treatment Plant