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What Happens to Sewage?

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What Happens to Sewage?

Where does our wastewater go? We take our drainage and our sewage systems for granted – they perform an invaluable service that keeps us from experiencing some incredibly unpleasant and potentially dangerous issues, and in this article we’re going to look at the journey of wastewater and how it’s dealt with. 

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Drainage

When we flush the toilet or drain the sink, the wastewater travels down our drains and into large sewage pipes under the road. Most properties have their own sewer pipe – once our wastewater passes through this pipe, it joins the wider sewage network which transports it to a sewage treatment plant.

 

Screening

When the wastewater arrives at the treatment plant, it is subject to a screening process. This process removes the large objects from the water – they will be disposed of in landfill – and the wastewater can then continue along the system. After the initial screening, the wastewater enters a grit chamber that removes things like rocks and gravel. Once both screenings have been completed, the wastewater travels into a sedimentation tank, where smaller solids sink to the bottom and things like fats and oils rise to the top. The matter at the bottom and the top is disposed of. 

 

Aeration

After screening, the wastewater enters the aeration process. This is a two-stage process that helps to remove the harmful bacteria and contaminants that live within the waste. Aeration means mixing with air, so in this case, the wastewater is mixed with air and certain microorganisms that ‘eat’ the harmful bacteria. The microorganisms are either kept in the aeration zone to continue consuming bacteria, or it is treated and either disposed of in landfill or used in land in agricultural settings. 

 

Disinfection

The wastewater is filtered again to remove any particles that may have slipped through the net in the screening and aeration stages. The wastewater is pushed through basins to ensure that all harmful bacteria is killed, and once this process is complete, the water can be reintroduced to groundwater, lakes and rivers.

 

Blocked drains

At best, blocked drains can lead to unpleasant smells and slow-draining sinks. At worst, they can result in sewage backups and leaks, which can be extremely dangerous as well as disgusting. Raw sewage is dangerous and harbours countless diseases, some of which can be fatal – if you’re noticing your sinks and baths are draining slower than usual or your toilet isn’t flushing properly, your drains might be blocked. Contact 1st Call Drain Clearance for swift, effective drain clearing to restore your drains to safe, working order. For more information, contact us today. 

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