How to upgrade the wastewater treatment plant
• How to upgrade wastewater treatment plants
In the beginning of April brought me to Lipetsk Aeration Station or, if abbreviated, MUP "fox". As you may have guessed, it is a municipal enterprise responsible for the treatment of urban wastewater. Last year there began large-scale reconstruction, designed to upgrade outdated components and, of course, to improve the quality of cleaning. According intelligence finish work in 2015 year, but now after the first stage, it is possible to speak of a substantial reduction in the load on the environment: for example, the concentration of harmful nitrogen and phosphorus compounds in waste water has decreased by nearly 15%. And two years later promised that the company will throw in the Voronezh River water, almost potable.
I propose to take the opportunity to see how and what has been done to date.
Lipetsk Wastewater Treatment Plant located on the left bank of the Voronezh River. The first set of mechanical treatment plant was put into operation in 1967, and the complex biological treatment plant for 8 years later. Reconstruction and operation of up to 2007 by a special sewage treatment plant Novolipetsk Steel, established in 1977. Municipal Unitary Enterprise "Lipetsk Aeration Station" was established in October 2007.
It consists of two production lines, which is divided a single complex of treatment facilities. First line, renovated in 2006, the design capacity of 90 000 m³ of wastewater per day for the left-bank part of the city remained in the ownership of the Novolipetsk Metallurgical Combine and transferred MUP rent. The second production line has an actual capacity 150 000 m³ per day and cleans the wastewater of right-bank part of the city. NLMK donated it to the municipal property, and is now operated aeration station on the right of business. Technological communication scheme allows to redistribute the water flows between the lines when necessary. For example, in the repair or reconstruction.
The area occupied by the enterprise - 62 hectares.
The entire perimeter of a length of about 5 km there is a concrete fence, and the entire area is under protection.
Of course, for many years of intensive use of the equipment is out of date, both physically and mentally.
It has grown significantly and he Lipetsk, increasing the load.
So, last year, for the implementation of water treatment facilities modernization program, European Bank for Reconstruction and Development has allocated 311 million rubles for 10 years.
In the first stage converted one aeration tank and two radial secondary clarifier.
Now all the details of the equipment made of stainless steel, so it will last much longer than their counterparts from black metal.
Please see secondary sedimentation tanks, and then descend to the aeration tank.
Although the process of sewage treatment occurs just in reverse order.
Tanks secondary settling tanks used old, but previously was conducted by experts and align the bottom of the reconstruction of the board. It was reinforced two-layer primer and tie and covered with two layers of epoxy resin.
Now the board as the newcomer. The TV also came to see what and how.
I would not want to part of this post once again plunge into the jungle and tell principle of the treatment facilities, but if very briefly, secondary sedimentation tanks are used for the separation of activated sludge and biologically purified water. Activated sludge settles to the bottom of the settler, and special iloskrobom removed sludge chamber.
Compared to the primary clarifiers and aeration tanks water here seems to be quite clean and does not smell.
What is already being used by impudent gulls.
The next picture gives some insight into the depth of the tank. Go to the next measurement in the queue of the secondary clarifier.
In the next year and a half to two existing added six more modern cesspool emptier. Thus, it will be commissioned in eight secondary settling tanks of 40 m diameter each.
And now, as agreed, move to the aeration tank. To begin, take a look at the old aeration tank, although it would be interesting to look at, and that joker invented paint it in a radically pink.
Well, does not matter. The process of biological treatment in the aeration tanks based on the ability of certain species of microorganisms in certain circumstances to use pollutants for their nutrition. A plurality of microorganisms (bacteria, protozoa, algae) comprise activated sludge biological treatment plant, which is in the waste water, absorbs the contaminants into the cell where they are exposed to enzymes undergo biochemical transformations. This ensures the removal of organic contaminants as well as nitrogen and phosphorus compounds.
The time required for completion of all processes in the waste water contained in the aeration tank, the project is about 16 hours. The entire purification process occurs with the participation of the air which enters through the aeration porous pipe lying on the bottom. The air in the system, respectively, supplied from the blower duct system. The photo has converted bubbling aeration.
In the reconstruction of the aeration tank was introduced a new flowsheet for purification of harmful substances River - nitrogen and phosphorus compounds. Arranged technological sections, installed a new aeration system, pumps, submersible mixers and ducts.
Naturally, no paint is no longer needed. For stainless steel and aluminum. The sun shines so technological bridge that can cause blindness.
But the border of the reconstructed and the old aeration.