FI116054B - Wastewater treatment plants for single-family homes - Google Patents

Description

116054

Wastewater treatment plants for single-family houses Yksiperhetalon jätevedenpuhdistamo

This invention relates to a sewage treatment plant for a single-family house comprising a reactor tank to which waste water is pumped batchwise from a collection tank, the reactor tank having means for aerating the wastewater supplied to the reactor tank, means for supplying said waste water, removal of purified water from the reactor tank.

1 Sewage treatment plants of the above type are intended to purify calm wastewater per day. This has e.g. solved by the Norwegian company Biovac with a device, which includes a collection tank, a reactor and a sludge dryer. A batch of 300 liters of wastewater is pumped from the collection tank into the reactor, which is of relatively low construction and is divided into three adjacent and communicating chambers. In the first chamber, wastewater and active sludge are mixed and the mixture is vented by supplying nozzle via nozzles in the bottom of the reactor vessel for three hours. At the end of the aeration phase, in the second chamber, an aluminum-based fall chemical, PAX 21, is added to the mixture for precipitation of phosphorus contained therein. After aeration, the sludge was allowed to settle for about: 20 hours, which sludge was then pumped to a separate vessel for drying. The purified: wastewater is removed from the reactor e.g. as an overflow from the last chamber of the reactor, where a new batch is pumped into the first chamber of the reactor. The device is everything; Designed to perform three to four cleaning cycles per day.

• * *. . The disadvantages of the previously known wastewater treatment plants are that they are of a '' '' construction, which requires a superstructure to protect the equipment from the weather and wind, and which is dimensioned so that an excessively low aeration height is obtained in the rear.

"I I

The actuator, which leads to incomplete nitrogen reduction and increased energy consumption as a result of the process having to supply a large excess oxygen to achieve acceptable nitrogen reduction levels. In addition, the sludge dryer requires additional energy.

The present invention has the object of eliminating the aforementioned problems, which is achieved by a wastewater treatment plant characterized in that the reactor tank is of lightweight construction with mainly cylindrical sheath made by spiral winding of a hollow thermoplastic profile, which is divided into an intermediate dry intermediate tank. for the required process equipment and a lower liquid space, which liquid space is designed to accommodate more than two batches of wastewater with a liquid depth which gives an aeration height of about two meters above a bottom of the liquid space for a batch cleaning process. The means for removing purified water from the reactor tank is a submersible pump or a valve arranged at the same level in the wall of the reactor tank to approximately half the height of the liquid space of the reactor tank.

According to a preferred embodiment, the reactor tank is constructed with a bottom plate 15 having a diameter noticeably exceeding the outer diameter of the jacket. By having the reactor vessel constructed with a mantle in the above-mentioned manner, a relatively light construction with reasonable thermal insulation properties is obtained, so that the reactor does not need any extra superstructure. The upper dry space of the process equipment can conveniently be closed with a heavy cover or cover. A suitable method of mounting is that the reactor tank is buried in the ground to such a depth that essentially only ··· j in the dry space of the reactor tank protrudes above the ground surface. The wide bottom plate has the task of anchoring the reactor tank and preventing flow water and the like to pressurize the reactor tank out of the ground.

: · 25 The dry space at the top of the reactor tank holds at least one compressor for. · · ·. providing the compressed air intended to be used for aeration of the air; In the lower liquid space, the mixture of sludge and wastewater was pumped, a chemical dosing tank for supplying a fall chemical to said mixture for precipitation of phosphorus contained therein, and a microprocessor for controlling the entire wastewater purification process.

In order to pump a new batch of the mixture of wastewater and active sludge collected into the reactor tank, a cutting submersible pump is suitably submerged to the bottom of the collection tank, which simultaneously pumps said mixture through a conduit up to the upper portion of the liquid. The vessel is arranged to cut larger solid articles which have fallen into the drain.

The compressed air produced by the compressor is arranged to be directed down a pipeline to a substantially centrally located aeration plate located on the bottom of the reactor tank, which is designed to disperse air jets over substantially the entire cross-section of the reactor tank, and thus provide a possible effective nitrogen reduction in the mixing of the sludge, when the oxygen bubbles seek to eat up through the liquid column formed by the said mixture about 2 meters high.

| After completion of aeration, a clamping phase follows as the sludge and the precipitated phosphorus compounds descend to the bottom of the liquid space in the reactor tank, after which about half the volume of purified liquid is removed from the reactor tank. According to a preferred embodiment, this is done with a tile approximately half the height of the reactor tank's liquid space submerged pump, which is arranged on the start pulse from the plant's microprocessor at the end of a purification cycle to pump the purified liquid into a drain; : 20 ditch or ground bed.

In another embodiment, one or more valves are mounted in the reactor tank I. 'Wall, at about half the height of the reactor tank's liquid space, which or which of the impulses from the microprocessor are openable and closable. The purified liquid discharged via the valve can be directed directly into a liquid-sucking drain ditch or. · · ·, A ground bed.

'..! According to a preferred embodiment, the wastewater treatment plant comprises a collection tank of similar cylindrical lightweight construction as the reactor tank. The collection tank has an inlet which is connected to the drain line from the housing and an outlet at the same or slightly lower level, to accidentally divert overflow effluent water, e.g. at a downtime at the sewage treatment plant. The collection tank is dimensioned to hold just over one batch of wastewater during said discharge and has a total height that reaches up to ground level as it is dug into the ground to the same depth as the reactor tank. In its uppermost portion, the collection tank has a pipe connection for a connection pipe which is intended to connect the topmost portion of the collection tank to the topmost portion of the reactor tank's liquid space. The collection tank preferably has a similar bottom plate as the reactor tank.

Through said connecting pipe, it is intended to draw at least the conduit coupled to the cutting submersible pump at the bottom of the collection tank and intended to carry wastewater to the reactor tank in batches, and, in the case of the purified liquid, to allow the space of the reactor tank to escape. is removed by pump at the end of a purification cycle, the conduit connected to said pump, which conduit is passed down to and out through the outlet of the collection tank to open into a drain ditch or a ground bed.

In order to facilitate the handling of the neutralized sludge which has fallen into the bottom of the reactor tank, an additional pump can be lowered to the bottom of the reactor tank to: * · periodically, e.g. after several purification cycles, the slurry pumps via a • »•» · M! The pipe drawn through the previously mentioned connection pipe to the upper part of the collection tank, where it opens into a detachably attached filter bag. The sludge water that passes through the slurry passes through the filter bag into the collection tank, from where it is pumped back into the reactor tank at the start of a new purification cycle. As the liquid can be drained, the sludge can be emptied into a compost or used as soil improvement; <· § 25 ring material, whereupon the filter bag is reattached in place. The filter bag can also, ·, be made of a compostable material, whereby a new filter bag is mounted after, after the previous bag has been filled and the water has run off.

According to a preferred embodiment, the sewage treatment plant according to the invention is intended to treat a batch of about 500 liters of wastewater during a purification cycle of about 12 hours, so that about 1000 liters of membranes are treated for one day. The purification cycle comprises pumping a new batch of wastewater into the reactor tank, aeration for 5-7 hours, supplying a fallout chemical to the mixture of sludge and wastewater in the reactor tank's liquid space, either at the beginning or at the end of the aeration phase, during the phasing phase. The aeration is followed by a clamping phase as the mixture is solidified and sludge and precipitated phosphorus compounds are sedimented on the bottom of the reactor tank.

During this period, the anaerobic reactions also occur, where, among other things, harmful nitrogen compounds are decomposed, which clamping phase is carried out for about 5-7 hours, after which pumping out or draining of the clammed and purified water in the upper half of the reactor tank's liquid space takes place. Thus, in the reactor tank, a quantity of liquid corresponding to about one batch remains.

Advantageously, in the collection tank is mounted a means which senses liquid level therein and which is arranged to deliver a start signal to the cutting pump in the bottom of the collection tank, as the wastewater level has risen to a predetermined: level corresponding to the volume of a new batch of wastewater. .

Various aluminum or iron based chemicals or some polyelectrolyte can be used as a precipitating chemical. Examples of useful fall chemicals are aluminum sulfate, aluminum chloride, ferrous sulfate and ferric chloride, as well as mixtures of these.

In an existing drainage system with sludge wells in series, the first sludge well can conveniently be used as a collection tank, the reactor tank being buried next to it and connected to this in the manner indicated above, whereby the conduit for it. . The purified water is drawn into the following well via the first well, so that it is earlier. · · ·. the sewage system can continue to be utilized and can, if necessary, incidentally receive wastewater at a possible downtime at the sewage treatment plant.

In the following, the invention will be described in more detail with reference to the accompanying drawing, which shows an example of a sewage treatment plant according to the invention in perspective with the side walls foaming.

6 116054

The wastewater treatment plant shown in the drawing comprises a reactor tank 1 and a collection tank 2. The two tanks are of lightweight construction with mainly cylindrical sidewalls of double wall thermoplastic. In the example shown, the walls are constructed by spirally wound a hollow thermoplastic profile, which leads to a construction with relatively good thermal insulation capacity, which means that the plant does not need any extra superstructure. In order to anchor the tanks as they are buried in the ground, they are provided with wide bottom plates 3 and 4 with a significantly larger diameter than the outer diameter of the respective sidewall.

10

The interior of the reactor tank 1, with an intermediate bottom 5, is divided into an Upper dry space 6 and a lower liquid space 7, which is dimensioned to accommodate the volume of about two batches of wastewater with a liquid depth giving an aeration height of about 2 meters.

In the dry space 6, necessary process equipment is mounted, comprising compressor 8 for providing compressed air for aerating the mixture of sludge and t. wastewater, chemical dosing tank 9 for the precipitation chemical intended to be used in the phosphorus precipitation process, and a microprocessor 10 for controlling the wastewater treatment process. 1:: 20 The collection tank 2 has an inlet 11 which is intended to be connected to the sewer *; the pipe from the house whose wastewater is to be purified, and an outlet 12 arranged at approximately the same or slightly lower level, below which a good batch of wastewater is intended to be contained. At the top of the collection tank 2 is a pipe connection 13 for a connection pipe 14: between the collection tank 2 and the reaction tank 1 which opens into the upper part of the liquid space 7. of the reactor tank. · · ·. connection pipe 14 is drawn to a cutting pump 15 at the bottom of the bottom of the collection tank 2 coupled conduit 16 for conducting a new batch of wastewater to. The reactor tank's liquid space 7. At the bottom of the reactor tank 1, an aeration plate 17 is provided, to which compressed air from the compressor 8 is conducted via a pipeline 30. To a level corresponding to about half the height of the reactor tank's liquid space 7, a second pump 19 is submerged. which is routed via a conduit through the connection tube 14 to the collection vessel 2 and thence further out through the outlet 12 to a drain ditch or a bench.

In order to be able to periodically remove at the bottom 3 of the reactor tank's liquid space 7 sedimented sludge, a third pump 21 is submerged to the bottom of the liquid space 7 which is connected to a conduit 22 drawn through the connection pipe 14 to the upper part of the collection tank. where it opens into a releasably attached filter bag 23, into which the slurry is pumped, and accompanying water is allowed to flow through the filter bag 23, which can be removed and emptied as it is filled and all water run off.

Experiments have shown that where the bacterial strain in the reactor tank is fully grown and stable is achieved with the sewage treatment plant according to the invention, a purification result which by margin exceeds 95% BOD7, 95% phosphorus reduction and 95% nitrogen reduction.

15 f • · • 1 · »1 1 • I> · ·

Claims (13)

116054 A wastewater treatment plant for a single-family house comprising a reactor tank (1) to which wastewater is pumped batchwise from a collection tank (2), which reactor tank (1) has means (8, 17, 18) for aerating the discharge to the reactor tank (1). The running water, means (9) for supplying falling chemicals to said wastewater, and means (19, 20) for removing purified water from the reactor tank (1), characterized in that the reactor tank (1) is of lightweight construction with a substantially cylindrical sheath. produced by spirally wound a hollow thermoplastic profile, which reactor tank (1) is divided by an intermediate bottom (5) into an upper dry space (6) for the required process equipment and a lower liquid space (7), which liquid space (7) is dimensioned to accommodate over two batches of wastewater with a liquid depth that gives an aeration height of about two meters above one on the bottom of the liquid space during a batch cleaning process (7) provided an air-dispensing portion of the means (17) for aeration, and that the means (20) for removing purified water from the reactor tank (1) is about one-half the height of the liquid space of the reactor tank (7) or a pump. the same level valve located in the reactor port; Ken (l) wall. A sewage treatment plant according to claim 1, characterized in that the reactor tank '(2) (1) comprises a bottom plate (3) having a diameter noticeably exceeding the outer diameter of the jacket. 2. Patenttivaatimuksen 1 mukainen jätevedenpuhdistamo, tunnettu siitä, etäeak-tiosäiliö (1) käsittää pohjalaatan (3) jonka halkaisija huomattavasti ylittää vaipan ulkohalkaisijan. j 3. Patenttivaatimuksen 2 mukainen jätevedenpuhdistamo, tunnettu siitä, etä ylem pään kuivaan tilaan (6) sisältyy jäteveden ilmastamiseen tarkoitettu compressori (8) 3. Sewage treatment plant according to claim 2, characterized in that the upper dry space (6) contains a compressor (8) for aeration of the waste water, a chemical dosing tank (9) for supplying a fall chemical and a microprocessor. · · ·. processor (10) for controlling the purification process. A sewage treatment plant according to claim 3, characterized in that a cutting submersible pump (15) is submerged to the bottom of the collection tank (2) to pump a new batch of wastewater into the reactor tank (1) at the beginning of a purification cycle. 116054 4. Patenttivaatimuksen 3 mukainen jätevedenpuhdistamo, tunnettu siitä, one playkava uppopumppu (15) on upotettu keräyssäiliön (2) pohjalle uuden jätevesi er pumppaamiseksi reactorisäiliöön (1) puhdistuskierron. '' 5. Patenttivaatimuksen 4 mukainen jätevedenpuhdistamo, tunnettu siitä, one 20 compressor (8) on putkijohdon (18) velityksellä liitetty reaktiosäiliön (1) pohjalle * · · | sideways ilmastuslautaseen (17), joka toimii ilmaa purkavana osana. ! .. * 6. Patenttivaatimuksen 5 mukainen jätevedenpuhdistamo, tunnettu siitä, etä veli- «» neet (19,20) puhdistetun veden poistamiseksi reactorisäiliöstä (1) muodostuu nes-: 25 tetilaan (7) upotetusta pumpusta (19) ) kautta on kunkin puh- eis ». ”·. distuskierron j älkeen j äij estetty pumppaamaan er puhdistettua vettä viemärioj aan., '. tai vastaavaan. • · Sewage treatment plant according to claim 4, characterized in that the compressoine (8) is connected via a pipeline (18) to a venting plate (17) located on the bottom (3) of the reactor tank (1), which acts as an air-releasing part. i} Sewage treatment plant according to claim 5, characterized in that the means (19, 20. for removing the purified water from the reactor tank (1) is a pump (19) submerged in the liquid space (7)), which via an outlet pipe (20) is arranged to pump out a batch of purified water into a drain ditch or the like after each purification cycle. 7. Patenttivaatimuksen 5 mukainen jätevedenpuhdistamo, tunnettu siitä, että READY-3 0 NEET puhdistetun wood poistamiseksi reaktorisäiliöstä muodostuu ainakin yhdestä reaktorisäiliön seinämään asennetusta, mikroprosessorin impulssien vaikutuksesta 116054 avautuvasta yes sulkeutuvasta venttiilistä, joka päättyy nestettä imevään viemäriojaan tai maapetiin. Sewage treatment plant according to claim 5, characterized in that the means for removing purified water from the reactor tank are at least one mounted in the wall of the reactor tank, by means of impulses from the microprocessor opening and closing valve, which opens into a liquid suction or drain. ground- J 15 bed. in 8. Jonkin nobellisen patenttivaatimuksen mukainen jätevedenpuhdistamo, tunnettu 5 siitä, että se käsittää reactorisäiliön (1) kaltaisen sylinterinmuotoisen kevytrakenteisen keräyssäiliön (2) ja siinä on talon viemärijohtön (2) on mitoitettu niin, one siihen mainitun poiston (12) alapuolelle mahtuu runsas yksi erä jätevettä ja young yläosassa on putkiliitos (13) liitosputkea (14) varten keräyssäiliön 10 (2) ylimmän osan yhdistämisön osaan. Sewage treatment plant according to any one of the preceding claims, characterized in that it comprises a collection tank (2) of similar cylindrical lightweight construction as the reactor tank (1) and having a tile housing drain line:: connectable inlet (11) and an outlet ( 12) at the same or slightly lower level, which -: · collection tank (2) is dimensioned to hold over a set of wastewater during said outlet (12) and which has at its top part a pipe connection (13); / for a connection pipe ( 14), which is intended to connect the top portion of the collection tank to the upper tank (2) with the top portion of the liquid space (7) of the reactor tank (1). 25 i * · I »» ·, ·. Sewage treatment plant according to claim 8, characterized in that the line (16) from the cutting submersible pump (15) in the collection tank (2), and the line \! (20) from the pump (19) for removing purified water from the reactor tank (1) is fed through said connection pipe (14), the latter pipe (20) being passed through the outlet (12) in the collection tank (2). 116054 9. Patent Tivaatimuksen 8 mukainen jätevedenpuhdistamo, tunnettu siitä, one johto (16) keräyssäiliössä (2) olevasta playkaavasta uppopumpusta (15) or johto (20) puhdistettua vettä reactiosäiliöstä (1) poistavasta , jolloin viimeksi mainittu johto (20) on vedetty edelleen ulos keräyssäiliössä (2) olevan poiston (12) kautta. 10. Patent Tivatimuksen 9 mukainen jätevedenpuhdistamo, tunnettu siitä, one reactor seal (1) pohj alle on laskettu pumppu (21) pumppaamaan lietettä tasavälein • 20 mainitun liitosputken (14) jäte keräyssäiliön (2) päättyy irrotettavasti kiinnitettyyn suodatinpussiin (23). _! .. '11. Jonkin edellisen patenttivaatimuksen mukainen jätevedenpuhdistamo, tunnettu vesi- ja liete- * - », '. seoksen läsnä ollessa., · ·, 12. Patenttivaatimuksen 11 mukainen jätevedenpuhdistamo, tunnettu siitä, etä%» keräyssäiliössä (2) on keräyssäiliössä (2) olevan jätevää tason noustua uuden jätevesierän tilavuutta vastaavalle ennalta mee- 116054 rätylle tasolle lähettää käynnistys signaalin keräyssäiliön (2) pohjalla olevalle lakkaavalle pumpulle (15). Sewage treatment plant according to claim 9, characterized in that a pump (21) is submerged to the bottom (3) of the reactor tank (1) for periodically pumping sludge via a through pipe (14) to the upper part of the collection tank. (2) guide conduit (22), which opens into a releasably solid filter bag (23). 5 Sewage treatment plant according to any of the preceding claims, characterized in that the sewage treatment plant is dimensioned to purify a batch of about 500 liters of wastewater in 12 hours in the presence of a substantially equal volume of a mixture of water and sludge. Sewage treatment plant according to claim 11, characterized in that the collection tank (2) has a means for detecting level of waste water in the collection tank (2) and for delivering a start signal to the cutting pump (15) in the bottom of the collection tank. (2) when the wastewater level rises to a predetermined level corresponding to the volume of a new batch of wastewater. Sewage treatment plant according to any of claims 10-12, characterized in that the filter bag (23) with collected sludge is compostable. • »·: 20 Patent Tivaatimukset: *» 1 - • · · \ 1. Yksiperhetalon jätevedenpuhdistamo, joka käsittää reactiosäiliön (1), johon jäte- • ·. , vettä pumpataan erinä keräyssäiliöstä (2), jossa reactiosäiliössä (1) on välineet (8, • »· * * 17, 18) reactiosäiliöön (1) syötetyn jäteveden ilmastamiseksi, välineet (9) saostus-chemicalsikää (19, 20) puhdistetun, ·. 25 wood poistamiseksi reaktiosäiliöstä, tunnettu siitä, että reaktiosäiliö (1) on kevytrakenteinen ja varustettu pääasiassa sylinterinmuotoisella vaipalla, joka on valmistettu onttoa kestomuoviprophilia 6) tarvittavaa prosessikalustoa varten ja alempaan nestetilaan (7), joka nestillä (7) on mitoitettu niin, etä siihen erissä 3 0 116054 pohjalle asennetun ilmastusvälineiden (17) ilmaa purkavan osan yläpuolellepa että väline (20) puhdistetun veden poistamiseksi reaktiosäiliöstä (1) on pumppu, joka on upotettu noin puoleen corkeuteen reaktiosäiliön nestetilasta 5 13. Jonkin patenttivaatimuksen 10-12 mukainen jätevedenpuhdistamo, tunnettu 5 siitä, etä suodatinpussi (23) jossa on lietettyä lietettä on compostoituva. > · »* I« »» I »» * 1 • (• I 1 »* I -»> * »