fbpx

How does Ozone work in Wastewater Treatment?

The wastewater treatment process requires a potent agent. In this article you’ll see how Ozone can treat even wastewater, eliminating virus, bacteria, protozoa and many other microorganisms, reducing the use of chemicals, and leaving the process more environmentally friendly.

And how can Ozone act in the wastewater treatment system? Learn as you read below!

In the last 20 years, humans are more exposed to wastewater discharged into the environment.

Ozonization is an emerging technology for disinfection and removing of micropollutants present in the wastewater.

Because ozone is a highly disinfecting and oxidizing agent, many municipalities and industries prefer this advantage technology to treat wastewater.

The application of ozone in the wastewater became more and more popular because it is a reliable process.

How does it work?

The primary mechanism for the destruction of pathogenic organisms to prevent the spread of waterborne diseases is disinfection and ozone is considered, for many studies, the most powerful disinfecting and oxidizing agent.

Ozone is a powerful oxidant and is capable of oxidative degradation of many organic and inorganic compounds. Ozonation degrades efficiently most of the micropollutants present in the wastewater.

Ozone is soluble in water and it decomposes to oxygen, leaves no residual harmful product, no sludge disposal problem and increases the dissolved oxygen (DO) content of wastewater, which helps further in the degradation of residual pollutant.

It is a powerful disinfectant, too. Ozone does not produce any secondary pollutants as compared to chlorine which produces THM, chloramines that are carcinogenic in nature.

A faster ozone reaction means shorter contact time. The reactions with viruses are rapid and there is no risk and toxicity and odor problems.

Ozone is effective 25 times more than hypochlorous acid, 2500 times more than hypochlorite and 5,000 times more than chloramines. All these excellent properties have made ozonization more and more applicative in different fields of wastewater and drinking water treatment.

Ozonation, which is utilized in advanced treatment of secondary wastewater effluent and has shown potential as a means of peroxidising and disinfecting primary wastewater effluents, appears promising in this regard. Recent studies have shown that relatively low ozone (O3) doses (e5 mg/L) can yield >90% depletion of many antibacterial compounds in wastewaters.

Ozone eliminates the following microorganisms that are present in wastewater:

ORGANISM

DISEASE CAUSED

BACTERIA

Escherichia coli (enterotoxigenic)

Gastroenteritis

Leptospira (spp.)

Leptospirosis

Salmonella typhi

Typhoid fever

Salmonella (2,100 serotypes)

Salmonellosis

Shigella(4 spp.)

Shigellosis (bacillary dysentery)

Vibrio cholerae

Cholera

PROTOZOA

Balantidium coli

Balantidiasis

Cryptospodidium parvum

Cryptosporidiosis

Entamoeba histolytica

Amebiasis (amoebic dysentery)

Giardia lamblia elminths

Giardiasis

Ascaris lumbricoides

Ascariasis

T.solium

Taeniasis

Trichuris trichiura

Trichuriasis

VIRUSES

Enteroviruses (72 types, e.g., polio, echo and coxsackie viruses)

Gastroenteritis, heart anomalies, meningitis

Hepatitis A Virus

Infectious hepatitis

Norwalk Agent

Gastroenteritis

Rotavirus

Gastroenteritis

Some specific compounds oxidized by ozone:

Ammonia

Tannic acids (plants-originated accids)

Amoebae

Spores of Molds

Phenolics

Sulfides

2.4 D

Dioxines

Detergents

Cyanides

Arsenic

Fulvic

DDT

Clorine and its derivatives

Ozone use

Ozone is used to treat a wide variety of wastewater including:

  • Municipals

  • Paper industries

  • Textile industries

  • Meat processing

  • Animal waste treatment

  • Septic

  • Cutting fluids recycling

  • Chicken egg processing effluent

  • Laundry water recycling

Ozone is increasingly used, in combination with other treatments, for eliminating all traces of harmful substances. The advantage here is that ozone treatment does not require the use of additive products, which may prove toxic.

To apply conventional purification techniques first and follow up with ozonation as a second stage, it is advised by many researchers. Thus, ozone is increasingly used as final treatment stage for eliminating all traces of harmful substances.

The effectiveness of disinfection depends on the susceptibility of the target organisms, the contact time, and the concentration of ozone.

All its properties have made ozone as an ultimate treatment for all types of wastewater treatment.

Benefits

  • Ozone is an effective disinfectant and kills bacteria and virus;

  • Oxidation of wastewater with ozone has several advantages as increasing dissolved oxygen, reducing chemical consumption, and decreasing turbidity and color;

  • There are no harmful residuals that need to be removed after ozone treatment because it decomposes rapidly;

  • Ozone acts as an effective deodorizer and will remove unpleasant or chemicals odors from treated water;

  • After ozonization, there is no regrowth of microorganisms;

  • Ozone eliminates heavy metals from wastewater;

  • Ozone eliminates phenols (coking plant, oil refineries, petrochemical plant, mines, chemical and pharmaceutical process lines, foodstuff, …);

  • Ozone is a natural, environmentally friendly disinfectant to which no microorganisms can build immunity;

  • In contrast to chlorine, ozone has an effect on Cryptosporidium P...

Scientific Articles

Published: 2020

LAPO RENAI, MASSIMO DEL BUBBA, AFSANE CHAVOSHANI, SURESH C. AMETA, FABIO BACCI, PABLO CAMPO & OTHERS | 2020 | Micropollutant

Published: 2015

XIANPING LUO, QUN YAN, CHUNYING WANG, CAIGUI LUO, NANA ZHOU, CHENSHENG JIAN | September 23rd | Treatment of Ammonia Nitrogen Wastewater in Low Concentration by Two-Stage Ozonization

Published: 2019

J. MORILLO ESPARZA, N. CEVALLOS CUEVA, C. SANDOVAL PAUKER, P. VARGAS JENTZSCH, F. MUÑOZ BISESTI | 2019 | Combined treatment using ozone for cyanide removal from wastewater: a comparison

Published: 2017
Published: 2011

JONAS MARGOT, ANOYS MAGNET, DENIS THONNEY, NATHALIE CÈVRE, FELIPPE DE ALENCASTRO, CORNELIA KIENLE, CHRISTIAN ABEGGLEN, DAVID ANDREW BARRY, LUCA ROSSI | May | Elimination of micropollutants in wastewater treatment plants : Ozonation or activated carbon? Conclusions of a one-year pilot project

Published: 2009

R. EL ARABY, S. HAWASH, G. EL DIWANI | December 25th | Treatment of iron and manganese in simulated groundwater via ozone technology

Published: 2008

A. RODRÍGUEZ, ROBERTO ROSAL, JOSE A. PERDIGÓN-MELÓN, M. MEZCUA | July | Ozone-Based Technologies in Water and Wastewater Treatment

Published: 2003

F. NAVA, U. URIBE, R. PÉREZ | March 15th | Use of ozone in the treatment of cyanide containing effluents

Published: 2002

US EPA (United States Environmental Protection Agency) – OFFICE OF WATER WASHINGTON D.C. | October | Proven Alternatives for Aboveground Treatment of Arsenic in Groundwater

PEI XU, MARIE-LAURE JANEX, PHILIPPE SAVOYE, ARNOLD COCKX, VALENTINA LAZAROVA | February | Wastewater disinfection by ozone: main parameters for process design

JAMES A. MUELLER, WILLIAM C. BOYLE, H. JOHANNES PÖPEL | 2002 | AERATION: Principles and Practice

Published: 1999

US EPA (United States Environmental Protection Agency) – OFFICE OF WATER WASHINGTON D.C. | September | Wastewater Technology Fact Sheet – Ozone Disinfection

US EPA (United States Environmental Protection Agency) – OFFICE OF WATER WASHINGTON D.C. | September | Wastewater Technology Fact Sheet – Fine Bubble Aeration

0