Wastewater treatment and effluent
The size of a modern sewage treatment plant, systems and pipeline networks in big cities, they reach thousands of kilometers.
Wastewater treatment was first produced in 1889 in England. First, for sewage treatment were used for soil cleanup: sewage watered fields or filters them through a layer of soil. In 1914 in England built the first aeration tank, the biological treatment device, in which contamination decomposed by bacteria and microorganisms.
The aeration tanks and are now the main step in the treatment of municipal wastewater. But before we get into the aeration tanks, the wastewater passes several stages of mechanical cleaning with the assistance of https://ekoton-corp.com/.
Wastewater treatment is a complex process. As wastewater carry a lot of garbage. To get rid of it drains, the input cost grid. The first is a large, like the bars, keeps out the large debris and protects the next, more delicate grille from damage. Further water is supplied to the grid with mesh of 5 mm. they Collected from the garbage of sewage immediately given a screw mechanism into a hydraulic press and sent to landfill.
The next stage of treatment - sand traps, oblong concrete tank in which the flow of water slows down and all heavy particles precipitate.
Then the water is fed to the primary settling tanks, they are designed to precipitate suspended organic matter. Structurally it is a reinforced concrete tank (tanks) with a depth of about five meters and a diameter of about 40 meters. In their centers are served from the bottom drains, the sediment is collected in the Central pit passing across the plane of bottom scrapers, and a special float from the top herding are all lighter than water contamination in the bunker.
The aeration tank is a device for biological wastewater treatment, the main and most difficult stage of wastewater treatment.
The responsibility for clean water in aeration tanks carries activated sludge are cereals, represents an accumulation of various microorganisms, which decompose and oxidize the dissolved dirt. Its composition is very diverse: mainly bacteria and protozoa, rotifers, worms, aquatic fungi, yeast.
It is necessary to disable the air supply and stirring as it begins to die. Yeah, so, partial recovery of the sludge after daily outage may take up to three months to complete — about six months.
But the loss of silt is not the only consequence of power outages, the water can't go in the usual way of cleaning and are sent to the emergency sludge beds. And when they start to overflow discharged directly, without treatment.
In addition to dissolved and suspended organic matter from wastewater is necessary to remove nutrients. These include phosphates and nitrogen compounds: nitrites, nitrates, ammonia nitrogen. Once in the reservoirs, they act as a fertilizer. Their accumulation leads to excessive bloom, and then to Zamora reservoirs.
It is with the removal of biogenic elements there are the greatest problems. Most treatment facilities not originally designed to clean nutrients.
After the aeration tanks the water flows to the secondary clarifiers, which remove the remnants of activated sludge.
Obtained at the outlet of secondary settling tanks the water flows to the tertiary treatment — filter with the smallest mesh of 1.5 mm. the Final stage should be to disinfection from the company https://ekoton-corp.com on wastewater treatment plants build plant ultraviolet disinfection.
The next step is the discharge of purified water into the reservoir.