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What is electrocoagulation process?

What is electrocoagulation process?

Electrocoagulation (EC) is an electrochemical water treatment process used by a variety of industries. The process destabilizes and aggregates contaminant particles, ions such as heavy metals, and colloids, using an electrical charge to hold them in solution.

What happens electrocoagulation?

In an electrocoagulation cell, an oxidation event occurs at the electrode (+), namely the anode, while the reduction occurs at the electrode (-) namely the cathode. The reaction involved in electrocoagulation in addition to the electrode is treated water, which functions as an electrolyte solution.

What are the different methods of treatment of industrial effluents?

Treatment of Industrial Effluents: Primary, Secondary and…

  • (i) Screening:
  • (ii) Neutralization:
  • (iii) Equalization:
  • (iv) Sedimentation:
  • (v) Coagulation:
  • (i) Trickling Filter:
  • (ii) Anaerobic Digestion:
  • (iii) Oxidation Ditch:

What is electrocoagulation in wastewater treatment?

Electrocoagulation consists of pairs of metal sheets called electrodes, that are arranged in pairs of two—anodes and cathodes. Using the principles of electrochemistry, the cathode is oxidized (loses electrons), while the water is reduced (gains electrons), thereby making the wastewater better treated.

What is electrocoagulation flotation?

Electrocoagulation/flotation (ECF) involves the generation of coagulant in situ by the dissolution of metal ions from the consumable anode with simultaneous formation of hydroxide ions at the cathode (Bayramoglu et al.

How many treatments are there for industrial effluents?

Treatment methods are often specific to the material being treated. Methods include advanced oxidation processing, distillation, adsorption, ozonation, vitrification, incineration, chemical immobilisation or landfill disposal.

What is an electrocoagulation unit?

Electrocoagulation (EC) is a broad-spectrum treatment technology that removes total suspended solids (TSS), heavy metals, emulsified oils, bacteria and other contaminants from water.

What is chemical coagulation?

In water supply system: Coagulation and flocculation. …a chemical process known as coagulation. Chemicals (coagulants) are added to the water to bring the nonsettling particles together into larger, heavier masses of solids called floc. Aluminum sulfate (alum) is the most common coagulant used for water purification.

How is effluent treated?

To complete secondary treatment, effluent from the sedimentation tank is usually disinfected with chlorine before being discharged into receiving Page 5 waters. Chlorine is fed into the water to kill pathogenic bacteria, and to reduce odor.

What is industry effluent?

Industrial effluents are discharges from various industries, and various organic pollutants have been found in different water resources. They belong to various classes such as pesticides, fertilizers, hydrocarbons, phenols, plasticizers, biphenyls, detergents, oils, greases, pharmaceuticals, etc. [83].

What are effluents?

Definition of effluent

  • : something that flows out: such as.
  • a : an outflowing branch of a main stream or lake.
  • b : waste material (such as smoke, liquid industrial refuse, or sewage) discharged into the environment especially when serving as a pollutant.

What are two types of chemicals used in coagulation?

Traditional chemical coagulation uses aluminum and iron coagulants. The most common aluminum coagulants are aluminum sulfate, aluminum chloride, and sodium aluminate. Iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride, and ferric chloride sulfate [4].

Which chemical is used for coagulation?

The main chemicals used for coagulation are aluminium sulphate (alum), polyaluminium chloride (also known as PAC or liquid alum), alum potash, and iron salts (ferric sulphate or ferric chloride).

Is electrocoagulation an effective wastewater treatment system?

On the other hand, Electrocoagulation is an extremely effective wastewater treatment system, removing pollutants and producing hydrogen gas simultaneously as revenue to compensate the operational cost [ 3 ].

What is electrocoagulation reactor?

The Electrocoagulation reactor is the reactor that electrochemically treats the wastewater. The treatment will remove the COD/BOD particles, Silica, TSS, Turbidity, Heavy metals, Hardness, partly nitrogen components, phosphate, and colour.

How is coagulant produced in electrochemical process?

In the EC process, coagulants were produced in situ by electrolytic oxidation of either aluminum (Al) or iron (Fe) ions from aluminum or iron electrodes ( Chen, 2004 ), metal ions produced at the anode and hydrogen gas released in the cathode.

How does electrocoagulation affect pH?

Electrolysis/electrocoagulation is closely associated with the variation of the pH and its effects on the experimental solutions. Different aluminium species are formed at the aluminium cathode (electrode) by the combination of the electro-dissolved Al 3+ ions with hydroxyl ions to affect the pH [ 29 ].