CZ2799U1 - Sewage water treatment plant with intermittent through-flow of activated sludge tank - Google Patents

Description

Technical field

Treatment of waste water with organic contamination that can be cleaned with biologically activated sludge.

BACKGROUND OF THE INVENTION

The most common type of household cleaning on. In our market are currently dry cleaners with bio-discs. These plants are normally available for sizes from 5 EO to 200 EO. For larger sizes, biological filters and fine bubble aeration systems are also used. Activation systems are continuous or intermittent. When continuous waste water flows through the coarse pre-treatment, it flows into the activation tank and after cleaning the mixture of treated water with activated sludge flows into a separate settling tank, where the sludge is separated and the purified water flows into the drain. In the system with intermittent treatment plant, there is no settling tank and after cleaning in the activation tank the aeration is interrupted and after settling the sludge the clean water is pumped to waste. Then the cycle is repeated.

Activation systems are difficult to use in small home systems for the demands of traffic management. In continuous-flow activated sludge treatment plants, the sludge is permanently pumped from the sedimentation tank to the wastewater inflow until activation, and if the activation concentration rises above the desired value, the excess Tkal is pumped from the sedimentation tank to the thickening and storage tanks. This requires the intervention of a qualified operator to measure _; regularly the sludge concentration in the activation. For small domestic wastewater treatment plants, this system is unusable for operator demands. In small sewage plants, the wastewater inflow is irregular activation, the reservoir being subjected to a sudden load, which is caused by the discharging of the wastewater at the outlet of the trough, and the wastewater is pumped over. rather complicated control system and are therefore suitable - mainly for cost reasons - rather for larger treatment plants over 30 PE.

Various types of soil filters are also used, but which have a significant effect on the purification of the waste water after the septic tank.

Substance_technical_resolutions

The wastewater treatment plant with intermittent flow of the activation tank, the essence of which is that the activation tank in which the excess sludge pump is located is preceded by a buffer tank with the raw water pump and with space for storing sludge of primary and excess sludge from the activation tank. The buffer tank has a minimum (trip) level, and a trip level. When the minimum level is reached, the aeration system with the raw water pump is switched off and the excess sludge pump in the activation tank is switched on. The excess sludge pump has an inlet at the desired sludge level after installation, thus ensuring that only the excess sludge is pumped off. After reaching the switch-on level in the buffer tank, the aeration system with the raw water pump is switched on again and the excess sludge pump is switched off. At a minimum wastewater inflow, the plant automatically switches from continuous to discontinuous mode, while excess sludge is pumped from the activation tank.

Overview of the drawings

The technical solution will be explained in more detail with the help of drawings, in which Fig. 1 shows a plan view of the treatment plant tank, Fig. 2 shows a section A - A ', Fig. 3 shows the section B - B' of a plant tank, Fig. Fig. 4 is a cross-sectional view of C-C '; and Fig. 5 is a cross-sectional view of D-D'.

Example of technical solution

The wastewater treatment plant with intermittent flow of the activation tank consists of three functionally separate tanks, which are usually connected into one building of plastic. The wastewater flows into the buffer tank X, which also functions as a primary sedimentation tank and a storage tank for excess sludge. 3. At full buffer tank χ, the waste water flows out of the primární primary - sedimentation through / anaerobic filter2. into activation tank X. After cleaning in activation tank X; the mixture of purified water 7 with activated quenching liquid flows into the feeder X, where the sludge settles _: - The bottom part and the water are purified by gravity flowing out of the &quot; bottom &quot;<< o <0 ^ «5nótti aktivační /^.NŽI^zdil/? from / 'běžnýc] ^! ^ tttÍriuálníchl / s ^' ^ 3 with those _{present in the} EK '-. _i í'ent OA. system · supplemented by? / © ;. The pump XI is a line which is permanently in operation. RVA at 1 e © t ivi reduces strokes water nu ^ £ f y EI ýyróvnávac χ.τTfmaMjeádosaženo reservoir, - water žesnerovnoměrnénríýpř.ítokuí.odpadní ch ¹ ≤ t ≤ assets% ádxž ^^ u) roto ^ i ^^ M'hydxaiq6

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raw water

With a minimum inflow of sewage, the water level in the buffer tank 10 is reduced to min. level 1 & wherein the float switch S switches off the compressors 10 and 11 (possibly a larger blower) and thereby causes the activation tank 3 to stand still. At the same time the sludge pump 14 is switched on, which starts pumping water from the activation tank 3 into the buffer tank. This sludge pump 14 is of low power and a 7 κ pump pressure and iu 14 is placed above the bottom at the desired sludge level 15 after installation. Typically, the inlet 17 to the sludge pump 14 is. at 1/3 of the water level in the activation tank 3, which corresponds to the sludge concentration after mixing 3 kg dry matter per 1 in. In small domestic treatment plants, it is suitable to use a mammoth driven by an aquaristic compressor of the sludge air pump 12 as a sludge pump. Initially the mixture of water and sludge is pumped, after settling of the sludge, after about 30 minutes, the excess sludge is drained to the desired level of sludge 15 after settling and finally the purified water is pumped. After the water level in the buffer tank 1 rises again to level 19, the float switch 8 switches off the sludge pump 14 and, at the same time, starts the aeration compressors 10, 11 and the raw water pump 13. The system then continues to operate as a conventional treatment plant with a continuous flow until the level in the buffer tank drops to the set min. level 1 8 buffer tank.

The main advantages of the sewage treatment plant with the operation described above are that, especially in small domestic sewage plants, where there is an irregular inflow of sewage, the activation load is evenly burdened and, above all, the demanding treatment plant operation is eliminated. This makes it possible to use fine-bubble activation even for small domestic wastewater treatment plants that have to operate unattended. Conventional activated sludge treatment plants, where the above described interruption of activation and subsequent automatic sludge pumping does not occur, require the operator, or larger plants, a complex automatics. The operator regularly takes a sample of the mixture from the activation and determines the amount after the sludge has settled. If the sludge is more than required, the operator will manually drain the excess from the settler into the storage tank.

A further advantage of the system is that in the case of an insufficient sewage inflow, the blowing time is substantially reduced, thereby delaying the time when the sludge autolysis will start to occur due to the lack of nutrients. For recreational facilities, it is possible to include a timer and start the plant for only a few hours a day, thus extending the plant's uptime.

Claims (4)

N O Jtr o k y ri £ t o ti x ~ £ l n u. A wastewater treatment plant with an intermittent flow of an activation tank, characterized in that the activation tank (3) in which the sludge pump (14) is located is preceded by a buffer tank (1) which is also a storage tank for excess sludge from the activation tank (3) and a raw water pump (13) is located therein. Treatment plant according to claim 1, characterized in that the buffer tank (1) has a minimum trip level (18) and a start level (19), wherein the trip level (18) of the aeration compressors (10), (11) and the pump (13). ) the raw water is at the same time the start level of the sludge pump (14) and the start-up level (19) of the aeration compressors (10), (11) and the raw water pump (13) is at the same time the cut-off level of the sludge pump (14). A treatment plant according to claim 1, characterized by. 7. The method according to claim 1, wherein the sludge pump (14) has an inlet (17) to the sludge pump at a height of the desired sludge level (15) after it has been charged. Treatment plant according to claim 1, characterized in that the air source of the raw water pump (13) and / or of the sludge pump (14) is at least one compressor f (Ji).