DO WATER TREATMENT METHODS CAN ELIMINATE CORONA VIRUS ?

 

INSACOG a forum setup by an Indian government to study and monitor genome sequencing and virus variation. Is tracking SARS CoV-2 in sewage. Currently daily covid cases were declined to 16,000 per day. But all time low cases was recorded as 11,000 cases daily during first wave. It has to be noted, after this decline second was started. Research says, there is a possibility of spreading Corona virus through sewage water. So in pandemic session treating sewage water is highly recommendable.

 

Transmission of  SARS CoV- 19 through sewage system...

A sewage leak led to a series of cases through aerosolization during a 2003 SARS outbreak in Hong Kong. Although there are no known cases of COVID-19 due to sewage leaks, the corona virus is closely associated to the one that causes SARS, and infection through this channel is a possibility.

The presence of severe acute respiratory syndrome corona virus 2 (SARS-CoV-2) in water and wastewater has recently been reported. According to the updated literature, the stools and masks of the patients diagnosed with corona virus disease (COVID-19) were considered as the primary route of corona virus transmission into water and wastewater. Most corona virus types which attack human (possible for SARS-CoV-2) are often inactivated rapidly in water (i.e., the survival of human corona virus 229E in water being 7 day at 23 °C).

As some corona virus, including the deadly SARS-CoV-19 one responsible for the COVID-19 pandemic, can remain infectious for days -- or even longer in sewage and drinking water -- researchers have called for more testing to determine whether water treatment methods are effective in killing corona virus.

For the corona virus-infected communities living in apartment buildings, wastewater plumbing systems have been considered as a potential pathway for transmitting the SARS-CoV-1 corona virus into the sewer system since 2013.

The SARS-CoV-2 and SARS-CoV-1 viruses share a similarity in their stability in aerosols and on surfaces.. Depending on the inoculum shed, the viruses can remain viable and infectious on surfaces (up to a few days) and in aerosols (for hours). Similarly, investigated the survival of SARS-CoV-2 in air, surface, and personal protective equipment of disease carriers and healthcare workers. They found that the samples collected from air outlet fans, door handles, sinks, and toilet bowls were positive, which confirms that SARS-CoV-2 can be transmitted through the stools of infected people.

Survival of SARS CoV- 19 in sewage....

The survival period of corona virus in water environments strongly depends on temperature, property of water, concentration of suspended solids and organic matter, solution pH, and dose of disinfectant used.

A recent study confirmed that SARS-CoV-2 RNA was detected in inflow wastewater (but not detected in outflow one). Although the existence of SARS-CoV-2 in water influents has been confirmed, an important question is whether it can survive or infect after the disinfection process of drinking water. To date, only one study confirmed that the infectivity of SARS-CoV-2 in water for people was null based on the absence of cytopathic effect (CPE) in infectivity tests. Therefore, further studies should focus on the survival of SARS-CoV-2 in water and wastewater under different operational conditions

 

Water treatment methods to eliminate SARS CoV- 19...

Most water treatment routines are believed to effectively kill or eliminate corona viruses in drinking and wastewater. Methods such as oxidation with hypochlorous acid or peracetic acid, and inactivation by ultraviolet irradiation, and chlorine, are considered to kill corona viruses.  The synergistic impact of beneficial microorganisms and the physical separation of suspended solids due to the use of membrane bioreactors in wastewater treatment plants, viruses concentrated in the sewage sludge get filtered out.

The researchers also recommended upgrading the existing water and wastewater treatment infrastructure in outbreak hot spots, which may receive corona virus from hospitals, community clinics, and nursing homes. In such cases, for example, light-emitting, diode-based, ultraviolet point-of-use systems could disinfect water before it finds its way into the public treatment system.

 

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