KR100775608B1 - Processing methode and apparatus for waste water using of sludge drawing and rotating disc - Google Patents

Abstract

A method and an apparatus for treating wastewater are provided to treat effectively BOD and SS components, nitrogen, and phosphorous, by using anaerobic microorganisms and aerobic microorganisms coexisting in a bio-membrane contact member. A deposition and screen process(ST11), a flow adjustment process(ST12), and a solid-liquid separation process(ST13) are sequentially performed on wastewater. An anaerobic contact process(ST14) is performed by converting nitrogen contained in the wastewater into nitrogen gas while a soluble organic material, which is not removed during the solid-liquid separation process, and sludge, which is recovered from a bio-membrane contact process(ST15), are mixed in an underwater stirrer. The bio-membrane contact process is performed by treating BOD and SS components, nitrogen, and phosphorous, which are not removed during the solid-liquid separation process and the anaerobic contact process, with anaerobic microorganisms and aerobic microorganisms, which coexist in a bio-membrane contact member rotating in the wastewater. The phosphorous is removed by separating the phosphorous-absorbing microorganisms from the bio-membrane contact member, and precipitating the phosphorous-absorbing microorganisms below a blocking plate. The BOD and SS components are removed by separating sludge where nitrogen is removed by an anaerobic condition below the blocking plate. A precipitation process(ST16) is performed by precipitating the sludge of the wastewater overflowing during the bio-membrane contact process to separate upper water from the sludge. A disinfection and discharge process(ST17) is performed by disinfecting and discharging the upper water.

Description

Process method and apparatus for waste water using sludge drawing and rotating disc

1 is a flow chart of the present invention

2 is a schematic diagram of the present invention

<Explanation of symbols for the main parts of the drawings>

10: sedimentation / screen bath 20: flow rate adjusting tank

30: solid-liquid separation tank 40: oxygen-free contact tank

50: biofilm contact tank 60: precipitation tank

70: disinfection / drain

The present invention relates to a wastewater treatment method and apparatus for purifying and treating sewage and wastewater, and more specifically, a flocculant is introduced into wastewater that is removed from contaminants and moved to a solid-liquid separation tank to physics of solid contaminants. In addition to sedimentation and removal, the solid-liquid separation tank reduces the load on the biofilm contacting tank, while maintaining the upper nitrification conditions in the upper part of the biofilm contacting tank, while the lower part forms anoxic conditions, thereby increasing the denitrification efficiency. The present invention relates to a method and apparatus for treating sewage and wastewater using sludge drawing and rotating discs that efficiently treat BOD, SS, nitrogen, and phosphorus by coexistence of anaerobic and aerobic tanks.

Recently, with the development of the industry, the economy has been improved and the industry has developed rapidly. Environmental pollution is also rapidly progressing. Among them, the development of sewage and wastewater treatment methods to maintain a clean and sanitary life as the problems of the water environment become serious. The development of treatment method for water and sewage is urgently needed. Especially, domestic sewage, manure waste and livestock waste water are processed depending on activated sludge method, but it is possible to remove suspended solids and organic matter, but nutrients such as nitrogen and phosphorus The treatment of the material is poor at less than 10%.

The treatment of nutrients such as nitrogen and phosphorus is achieved by adding a facility for removing nutrients to a facility for removing solid BOD and SS among contaminants and modifying the operation method, but this is a problem that the size of the facility becomes large. This is different from the activated sludge process, so a separate facility must be constructed to treat nutrients, and in order to process nitrogen, an aerobic nitrification process and an oxidized state (NO ₂₎ ^-, NO ₃ ^-, etc.), nitrogen compound the required denitrification process in an oxygen-free conditions for denitrification made of a nitrogen gas in the gas state, and to a method for treating the person is emitted to the inside microorganisms from the body in an anaerobic state of Phosphorus release and exhalation of phosphorus are required.

In addition, in order to simultaneously process nutrients such as nitrogen and phosphorus, the aerobic and anaerobic anaerobic requirements must be met throughout, but the nitrification required to process nitrogen compounds takes more time than denitrification and the concentration of nitrogen in the influent. If it is higher, the size of the aerobic reactor that induces nitrification should be increased.

The activated sludge method is classified into various types according to the type of aeration or inflow, but as shown in FIG. 1, the activated sludge method includes contaminants such as sand particles or boulder contained in the wastewater flowing into the wastewater pipe. A sedimentation / screen step of removing sediments of suspended solids mixed in the wastewater while being precipitated by gravity; A flow rate adjusting step of constantly supplying the wastewater from which the contaminants have been removed to the aeration step; Aeration step of oxidative decomposition and nitrification of organic matter by aerobic microorganisms, and excessive absorption of phosphorus released in sedimentation and inflow processes by aerobic microorganisms; A sedimentation step in which sludge of decomposed contaminants is precipitated and separated from the supernatant water; It consists of disinfection / discharge step to disinfect and discharge the treated water supplied in the settling step.

However, the activated sludge method can stably process solid BOD and SS among contaminants, but it can also stably process nitrogen and phosphorus as wastewater is continuously supplied even while treating nutrients nitrogen and phosphorus. In order to stably treat the nutrients nitrogen and phosphorus, it is necessary to expand the treatment facility of the sedimentation tank, so that the installation cost is increased, but there is a difficulty in the expansion space and difficult maintenance.

The present invention has been made in view of the above-mentioned conventional defects, and its object is to inject a flocculant into a wastewater from which sediments are removed from a sedimentation / screen bath, and then, in a short time, the solid form BOD and SS of contaminants Sludge drawing to remove nutrients nitrogen and phosphorus efficiently by rotating part of the biofilm contact member in which anaerobic / aerobic microorganism coexists while submerging and increasing denitrification efficiency in anaerobic contact tank. And to provide a wastewater treatment method and apparatus using a rotating disc.

The present invention for achieving this object,

A settling / screening step of sedimenting and removing contaminants such as sand particles contained in the wastewater flowing into the wastewater pipe;

A flow rate adjusting step of supplying the quality and quantity of the wastewater from which the contaminants are removed in the sedimentation / skins phase into the solid-liquid separation step;

A solid-liquid separation step in which a flocculant is added to the wastewater supplied in the flow rate adjusting step to settle out solid BOD and SS from the contaminants to remove sludge;

An oxygen free contact step of performing denitrification to convert nitrogen contained in the waste water into nitrogen gas while mixing the dissolved organic matter not removed in the solid-liquid separation step with the sludge returned in the biofilm contact step with an agitator in water;

BOD, nitrogen and phosphorus, which have not been removed in the solid-liquid separation step and anoxic contacting step, are treated with anaerobic and aerobic microorganisms coexisting in a biofilm contact member which rotates to partially immerse in the wastewater. Phosphorus treatment is performed by detaching from the contact member and settling to the lower part of the blocking plate. Nitrogen is removed by the anoxic condition at the lower part of the blocking plate to separate the settling sludge to remove phosphorus and solid form BOD and SS. A biofilm contacting step to return to supply to the tank;

A sedimentation step of separating the sewage from the wastewater sewage overflowed in the biofilm contacting step with the supernatant water;

Disinfecting the supernatant separated in the precipitation step is characterized in that consisting of a disinfection / discharge step.

In addition, the present invention, the sediment / screen tank for sedimentation and removal of contaminants, such as sand particles contained in the waste water flowing into the waste water pipe;

A flow rate adjusting tank for supplying the quality and quantity of the wastewater removed from the sedimentation / screen tank to the solid-liquid separation tank at a constant level;

A solid-liquid separation tank for injecting flocculant into the wastewater supplied from the flow rate adjusting tank to settle out the high-forming BOD and SS from the contaminants to remove sludge;

An oxygen free contact tank for denitrification to convert nitrogen contained in the wastewater water into nitrogen gas while mixing the dissolved organic matter not removed from the solid-liquid separation tank with the sludge returned from the biofilm contact tank with an underwater stirrer;

BOD and nitrogen and phosphorus not removed in the solid-liquid separation tank and the anoxic contact tank are treated with anaerobic microorganisms and aerobic microorganisms coexisting in a biofilm contact member rotating so as to be partially submerged in the wastewater. Phosphorus treatment is carried out by detaching from the biofilm contact member and settling to the lower part of the blocking plate, and nitrogen is removed by the anoxic condition of the lower part of the blocking plate to separate the settling sludge to remove phosphorus and solid form BOD and SS while removing a part of the sludge. A biofilm contacting tank to be supplied to the contacting tank;

A sedimentation tank which separates from the supernatant water while sludge of the sewage wastewater overflowed from the biofilm contact tank is precipitated;

Disinfecting the supernatant separated from the settling tank is characterized in that consisting of a disinfection / discharge tank.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a flowchart of the present invention, and FIG. 2 is a schematic diagram of the present invention.

The present invention, the sedimentation / screen step (ST11) for sedimentation and removal of contaminants such as sand particles contained in the wastewater flowing into the wastewater pipe;

A flow rate adjusting step (ST12) of continuously supplying the solid waste water quality and quantity to the solid-liquid separation step from which impurities are removed in the sedimentation / skins phase;

A solid-liquid separation step (ST13) for introducing a flocculant into the wastewater supplied in the flow rate adjusting step to settle out the solid-form BOD and SS from the contaminants to remove sludge;

Oxygen-free contact step (ST14) which denitrifies and converts nitrogen contained in wastewater water into nitrogen gas while mixing the dissolved organic matter not removed in the solid-liquid separation step and the sludge returned from the biofilm contact step with an agitator. ;

BOD, nitrogen and phosphorus, which have not been removed in the solid-liquid separation step and anoxic contacting step, are treated with anaerobic and aerobic microorganisms coexisting in a biofilm contact member which rotates to partially immerse in the wastewater. Phosphorus treatment is performed by detaching from the contact member and settling to the lower part of the blocking plate. Nitrogen is removed by the anoxic condition at the lower part of the blocking plate to separate the settling sludge to remove phosphorus and solid form BOD and SS. Biofilm contacting step (ST15) to be supplied to the tank;

A sedimentation step (ST16) which separates from the supernatant while sludge of the sewage wastewater overflowed in the biofilm contacting step is precipitated;

It consists of a disinfection / discharge step (ST17) to disinfect and discharge the supernatant separated in the precipitation step.

In addition, the present invention, the sediment / screen tank 10 for sedimenting and removing the contaminants, such as sand particles contained in the waste water flowing into the waste water pipe is configured, the contaminants in the sediment / screen tank 10 The flow rate adjustment tank 20 is configured to supply the quality and quantity of the wastewater from which the wastewater is removed to the solid-liquid separation tank at a constant rate, and a flocculant is added to the wastewater supplied from the flow rate adjustment tank 20 to form a solid BOD and The solid-liquid separation tank 30 which segregates and removes sludge by settingtle SS is comprised.

Oxygen-free contact tank for denitrification to convert nitrogen contained in the wastewater water into nitrogen gas while mixing the dissolved organic matter not removed from the solid-liquid separation tank 30 with sludge conveyed from the biofilm contact tank with an underwater stirrer. 40 and the anaerobic microorganisms coexisting in the biofilm contact member rotating so as to partially immerse the BOD and nitrogen and phosphorus in the wastewater, which are not removed in the solid-liquid separation tank 30 and the anoxic contact tank 40. Treated with aerobic microorganisms, the microorganisms that absorbed phosphorus are released from the biofilm contact member and sedimented to the lower part of the blocking plate to treat the phosphorus, and nitrogen is removed by the anoxic condition of the lower part of the blocking plate to separate the The biofilm contact tank 50 is configured to convey a portion of the sludge to the oxygen-free contact tank while removing the solid form BOD and SS. The sludge of the wastewater sewage is settled is composed of a sedimentation tank (60) for separating from the supernatant, and is composed of a disinfection / discharge tank (70) for discharging the supernatant separated from the sedimentation tank (60), more specifically Explained as follows.

The solid-liquid separation tank 30 is provided with a tank 31, the lower end of which is opened and closed so that sludge may be disposed while storing the wastewater supplied from the flow rate adjusting tank 20, and inside the tank 31. It is installed is provided with a porous trimming plate 32 for sedimentation and sedimentation of the contaminants of the solid-state BOD and SS, it is provided as an input tank 33 for injecting flocculant into the waste water stored in the tank 31.

The biofilm contact tank 50 is provided with a tank 51 having a lower end opened and closed so that sludge can be disposed while storing the wastewater supplied from the solid-liquid separation tank 30, and both sides of the tank 51 are provided. The biofilm contact member 52 is coupled to the support piece protruding from the upper end and rotates with the power of a motor to supply oxygen to the wastewater stored in the tank 51, and is located below the biofilm contact member 52. The blocking plate 53 is fixed to the inside of the tank 51 to block the upper movement of the sludge while blocking the oxygen supplied through the biofilm contact member 52 to be inclined.

The following describes the operation process of the present invention configured as described above in detail.

First, in order to grasp the cohesive performance of the coagulant of the present invention, any three wastewater treatment facilities currently in operation are selected and samples are collected, and the coagulant is added to the collected sample at a concentration of 5 ppm and reacted for 10 minutes. Water quality was analyzed by measuring solid BOD and SS after the input, and the results are shown in Table 1 below.

[Table 1] Supernatant Water Quality Before and After Coagulant Input

Sample Before input (ppm) After input (ppm) BOD SS BOD SS 1,2,3 148.9, 172.2, 113.5 125.3, 106.7, 161.3 13.0, 9.1, 11.28 9.7, 5.4, 12.48 Average 114.87 131.1 11.12 9.19

The solid form BOD is reduced by about 90% compared to before the input of the flocculant, the SS was reduced by about 93% compared to the input before the water quality of the supernatant was found to be very good.

In addition, in order to determine the effect of microorganisms due to the addition of flocculant, an arbitrary sample is taken at the facility currently in operation, and the flocculant is added at concentrations of 0.1 ml / L, 1 ml / L, and 10 ml / L to the collected sample. Was observed, and the results are shown in Table 2 below.

[Table 2] pH and microbial change according to the flocculant input

Flocculant concentration pH Microbial change Not input 7.3 Bacteria, Protozoa, Welfare Animals 0.1ml / L 7.4 Bacteria, Protozoa, Welfare Animals 1.0ml / L 7.3 Bacteria, Protozoa, Welfare Animals 10 ml / L 7.3 Bacteria, Protozoa, Welfare Animals

Even if the flocculant is increased to 10ml / L as shown in Table 2, it can be seen that no change in pH or microbial change due to the flocculant input, the flocculant does not affect the activity of the microorganism.

Under the above conditions, the sediment of the suspended solids mixed in the wastewater was removed from the sedimentation / screen tank 10 while sedimenting the pollutants such as sand particles or boulder in the wastewater flowing into the wastewater pipe by gravity. It is supplied to the flow adjustment tank 20 in the state, the flow adjustment tank 20 is supplied to the tank 31 of the solid-liquid separation tank 30, the waste water from which the contaminants of the suspended matter is removed.

At this time, 0.1 ml of coagulant per 1 L of wastewater discharged to the tank 31 of the solid-liquid separation tank 30 is introduced from the input tank 33, and the porous flocculent plate is reacted with the injected flocculant and the waste water. In the solid-liquid separation tank 30, sludge generated as the organic matter of the wastewater and the coagulant react for a short time is accumulated in the inner lower part of the tank 31, and part of the porous trimming plate 32 ) Is supplied to the oxygen-free contact tank 40, the sludge accumulated in the inner lower portion of the tank 31 is drawn at regular intervals.

In addition, the dissolved organic matter and the sludge conveyed from the biofilm contact tank 50 in the wastewater supplied to the oxygen-free contact tank 40 is reacted while being mixed by the underwater stirrer 41, at this time, contained in the sludge As nitrogen is denitrated, the waste water is supplied to the tank 51 of the biofilm contact tank 50 in a state of being converted / removed into nitrogen gas (N ₂ ).

The wastewater supplied to the tank 51 of the biofilm contact tank 50 flows into the biofilm contact member 52 in which a plurality of disks are assembled and rotated by a motor around the support piece while staying for a relatively long time. The lower end of the biofilm contact member 52 is immersed in the wastewater stored in the tank 51 and moved to the atmosphere, and the microorganisms are supplied to the microorganisms by oxygen supplied to the microorganisms while repeatedly immersing the wastewater in the wastewater again. Breeding.

Here, the aerobic microorganisms are present on the surface of the biofilm contact member 52, and anaerobic microorganisms are present therein to remove BOD, nitrogen, and phosphorus, and the removed BOD, nitrogen, and phosphorus are inclined blocking plate 53. It is possible to increase the denitrification efficiency due to anoxic conditions while blocking the movement to the upper part while accumulating at the lower end of the tank 51 via.

As the BOD, SS and nitrogen and phosphorus are treated in the biofilm contact tank 50, sludge accumulated in the inner lower portion of the tank 51 is drawn at regular intervals, and the wastewater passing through the biofilm contact tank 50 is settling tank 60. At the same time the sludge is accumulated in the sedimentation tank 60 and separated from the supernatant, and the separated supernatant is disinfected through the disinfection / discharge tank 60 and then discharged through the sewer pipe.

The sedimentation tank 60, the sludge accumulated in the solid-liquid separation tank 30 and the biofilm contact tank 50 is drawn at regular intervals, so that the load of the sedimentation tank 60 can be reduced, so that the size can be reduced.

As described above, according to the present invention, a small amount of flocculant (1 mg / L) is introduced into the solid-liquid separation tank through which wastewater is removed from the sedimentation / screen tank, and the solid BOD and SS in the contaminants are greatly reduced in a short time. By reducing the load of the biofilm contact member of the biofilm contact tank, and rotating the biofilm contact member of the biofilm contact tank while biologically removing BOD and nitrogen and phosphorus from pollutants in the wastewater. In this condition, the denitrification efficiency can be increased, which reduces the size of a separate anoxic tank for denitrification, and has the advantage that the size of the sewage treatment plant can be small but efficient.

In addition, since the weight of the biofilm contact member can be reduced while the area of the biofilm contact member is minimized by reducing the inflow load of the wastewater flowing into the biofilm contact tank, the economic efficiency can be improved by reducing the rotational power of the biofilm contact member. .

Claims (4)

A sedimentation / screen step (ST11) for sedimenting and removing contaminants such as sand particles contained in the wastewater flowing into the wastewater pipe; A flow rate adjusting step (ST12) of continuously supplying the solid waste water quality and quantity to the solid-liquid separation step from which impurities are removed in the sedimentation / skins phase; A solid-liquid separation step (ST13) for introducing a flocculant into the wastewater supplied in the flow rate adjusting step to settle out the solid-form BOD and SS from the contaminants to remove sludge; Oxygen-free contact step (ST14) which denitrifies and converts nitrogen contained in wastewater water into nitrogen gas while mixing the dissolved organic matter not removed in the solid-liquid separation step and the sludge returned from the biofilm contact step with an agitator. ; BOD, nitrogen and phosphorus, which have not been removed in the solid-liquid separation step and anoxic contacting step, are treated with anaerobic and aerobic microorganisms coexisting in a biofilm contact member which rotates to partially immerse in the wastewater. Phosphorus treatment is performed by detaching from the contact member and settling to the lower part of the blocking plate. Nitrogen is removed by the anoxic condition at the lower part of the blocking plate to separate the settling sludge to remove phosphorus and solid form BOD and SS. Biofilm contacting step (ST15) to be supplied to the tank; A sedimentation step (ST16) which separates from the supernatant while sludge of the sewage wastewater overflowed in the biofilm contacting step is precipitated; Wastewater treatment method using sludge drawing and rotating disc, characterized in that composed of a disinfection / discharge step (ST17) to disinfect and discharge the supernatant separated from the precipitation step. A sedimentation / screen tank 10 for sedimenting and removing contaminants such as sand particles contained in the wastewater flowing into the wastewater pipe; A flow rate adjusting tank 20 for supplying the solids separation tank with the quality and quantity of the wastewater removed from the sedimentation / screen tank 10 to be constant; A solid-liquid separation tank 30 for putting sludge into solid waste BOD and SS from contaminants by introducing a flocculant into the wastewater supplied from the flow adjusting tank 20 to remove sludge; The denitrification reaction is performed to convert nitrogen contained in the wastewater water into nitrogen gas while mixing the dissolved organic matter not removed in the solid-liquid separation tank 30 and the sludge returned from the biofilm contact tank with the underwater stirrer 41. An oxygen-free contact tank 40; Treating BOD and nitrogen and phosphorus not removed in the solid-liquid separation tank 30 and the oxygen-free contact tank 40 with anaerobic microorganisms and aerobic microorganisms coexisting in a biofilm contact member rotating so as to be partially submerged in the wastewater. Phosphorus-absorbing microorganisms are detached from the biofilm contact member and settle down to the bottom of the blocking plate to treat phosphorus, and nitrogen is removed by anoxic conditions under the blocking plate to separate the settled sludge to remove phosphorus and solid form BOD and SS. A biofilm contact tank 50 which conveys a portion of the sludge to the oxygen-free contact tank while being supplied; A sedimentation tank 60 which separates from the supernatant water while sludge of the sewage wastewater overflowed from the biofilm contact tank 50 is precipitated; Wastewater treatment apparatus using sludge drawing and rotating disc, characterized in that consisting of a disinfection / discharge tank (70) for discharging by disinfecting the supernatant separated from the sedimentation tank (60). The solid-liquid separation tank 30 of claim 2, A tank 31 having a lower end portion is opened and closed so as to discard sludge while storing the wastewater supplied from the flow rate adjustment tank 20, and is installed inside the tank 31 to contaminate solid form BOD and SS. A porous trimming plate 32 is provided to segregate and segregate the material, and the sludge drawing and rotating discs are provided as an input tank 33 for injecting a flocculant into the wastewater stored in the tank 31. Wastewater Treatment System. The biofilm contact tank 50 according to claim 2, A tank 51 having a lower end portion is opened and closed so as to discard sludge while storing the wastewater supplied from the solid-liquid separation tank 30, and is coupled to support pieces protruding from both upper end portions of the tank 51. The biofilm contact member 52 which rotates with the power of a motor to supply oxygen to the wastewater stored in the tank 51 is provided, and is fixed to the inside of the tank 51 so as to be located under the biofilm contact member 52. The wastewater treatment apparatus using the sludge drawing and the rotating disc, characterized in that the blocking plate 53 to block the upper movement of the sludge while blocking the oxygen supplied through the biofilm contact member 52 is inclined.

Images