![]() ![]() These microorganisms feed on the organic contaminants still present in the water and convert them into inorganic substances. More or less ventilated areas are created in which different milieu conditions are created for bacteria and microorganisms. The water is put into circulation by supplying oxygen and with the help of propellers. ![]() This is where the biological cleaning takes place. In most wastewater treatment plants, the water pre-purified in the mechanical treatment stage now reaches what are known as aeration tanks, which are often designed as circulation tanks. On its way through the wastewater treatment plant, the wastewater now reaches the next stage of wastewater treatment. On average, 30% to 40% of the pollution is removed from the wastewater in this phase. What remains is an odourless sludge, which is often used in agriculture after dewatering by centrifuge or filter. The digestion process in the digestion tower is completed after approximately four weeks. In the digestion tower, methane gas is produced in four phases (hydrolysis, acidification, acetone gene and methanogene phase) it is converted into electricity in a block heating plant and can be used to supply the plant with energy. A pump transports the fresh sludge to what is known as a digestion tower. The floating substances are transferred to a floating sludge duct. The primary sludge is pushed from the bottom into a fresh sludge hopper by a scraper. The sludge produced by sedimentation (settling to the bottom) is called primary sludge. A low flow velocity is necessary so that the finer dirt particles can, depending on their nature, settle on the bottom or on the water surface. The reduction of the flow velocity is achieved by widening the basin. 1.5 cm/s, significantly slower than in the sand collector. The primary wastewater treatment tank is the next stage of wastewater treatment. If further recycling is not possible, the sand collector debris must be disposed of properly it is landfilled or destroyed in waste incineration plants. This improves the dewatering of the collected inorganic material, which can, for example, be reused in road construction. After cleaning in the sand collector, the sand collector debris is washed and freed from organic substances. They can be easily removed from the water here.Ī round sand collector separates substances from the waste water with centrifugal force and sucks them away. The aerated sand collector removes additional fats and oils from the wastewater, and the following occurs: the introduced process air produces a rolling motion in the water, which carries lighter substances, such as oils and fats, to the surface. A distinction is made between the non-aerated long sand collector, the aerated long sand collector – also called a cylindrical sand collector –, and the round sand collector. This happens with a relatively high flow velocity of about 0.3 m/s. ![]() In wastewater treatment technology, a sedimentation tank is used to remove coarse particles, such as stones, glass splinters or sand, as well as coarse organic material that has not been separated out by the screens. The pre-purified water then passes into what is called a sand collector. The mechanically-recovered screen debris is dewatered and disposed of in an incineration plant. Various screens, from coarse screens with several centimetres gap width, to fine screens with a gap width of a few millimetres, through which the water flows at different speeds, filter out the coarse materials step-by-step. To achieve this, the wastewater is guided into a screening plant, where a screen or sieve drum filters out coarse impurities such as leaves, paper or textiles. In the first stage, the still completely untreated wastewater is mechanically treated this removes about 20 - 30% of the contained solids. ![]()
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