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Ozone Wastewater Treatment

KEY FEATURES:

  • Ozone is more effective than chlorine in destroying viruses and bacteria.
  • The Ozonation process utilizes a short contact time (approximately 10 to 30 minutes).
  • There are no harmful residuals that need to be removed after ozonation because ozone decomposes rapidly.
  • After ozonation, there is no regrowth of microorganisms, except for those protected by the particulates in the wastewater stream.
  • Ozone is generated onsite, and thus, there are fewer safety problems associated with shipping and handling.
  • Ozonation elevates the dissolved oxygen (DO) concentration of the effluent. The increase in DO can eliminate the need for reaeration and also raise the level of DO in the receiving stream.

OZONE FOR WASTEWATER TREATMENT

Ozone Wastewater Treatment is a mature and efficient alternative to improve the traditional methods. Historically, Municipal wastewater treatment uses chlorine for disinfection because of its effectiveness and low cost. However, in the early 1970s researchers found that free chlorine reacted with organics to form disinfection by-products (DBPs). These DBPs could adversely affect public health and aquatic life because of their carcinogenic properties. Fish kills were also experienced in water bodies receiving municipal wastewater disinfected with chlorine. The US Environmental Protection Agency (US EPA) promoted research on alternative disinfection such as ozonation and UV disinfection technology.

OZONE GENERATORS FOR WASTEWATER PLANTS

The industry uses bio and mechanical filtration for the bulk reduction of BOD/COD. This filtration is effective for reducing BOD/COD from 115,000 mg/L to about 50-100 mg/l. But reducing BOD/COD to a lower level using bio and mechanic filtration becoming very expensive. That is where hundreds of Water Treatment Plants (WTP) use ozone. Ozone can be used as the final step in the wastewater treatment process because is very effective as a water polisher. For instance, ozone economically reduces BOD/COD to safe levels before discharge into the receiving body of water. With ozone systems, you will not only reduce the processing costs but also eliminate the penalties associated with the disposal of contaminated water. Further benefits include the use of a clean, environmentally friendly technology, increasing oxygen demand, and an improvement in aesthetic characteristics due to a reduction in turbidity. Ozone wastewater treatment is now a mature technology used in some of the world’s largest cities for municipal wastewater treatment.

ADVANTAGES OF OZONE IN WASTEWATER DISINFECTION

Oxidation of wastewater effluents has several benefits, including an increase in dissolved oxygen, a decrease in chemical usage, and a reduction in turbidity and color.

Ozone is more effective than chlorine at killing viruses and bacteria. Also, the ozonation process required a short contact time (approximately 10 to 30 minutes). Ozone decomposes rapidly and completely, so there are no harmful residuals. After ozonation, there is no regrowth of microorganisms, except for those protected by the particulates in the wastewater stream.

Moreover, Ozone is produced onsite, and thus, there are fewer safety problems associated with shipping and handling.

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