JP4791420B2 - Wastewater treatment equipment - Google Patents

Description

  The present invention relates to a wastewater treatment apparatus that can appropriately purify wastewater containing fats and oils.

Conventionally, for example, a reaction tank into which wastewater containing urine from livestock barns such as cattle is introduced, and the wastewater that has flowed into the reaction tank is heated to 35 ° C. to 65 ° C. and fermented by microorganisms contained in the waste water There is known a waste water treatment apparatus comprising a heating means for decomposing organic matter and an adsorption tank in which an adsorbent such as activated carbon is arranged and adsorbs and removes organic matter in waste water flowing from the reaction tank (for example, , See Patent Document 1).
JP-A-6-15296

  However, in the wastewater treatment apparatus as described above, for example, the purification treatment of wastewater containing milk fat or the like discharged from a milking parlor or the like in a ranch or the like may be insufficient. Therefore, for example, the floating milk fat (floating oil and fat) floating on the water surface of the wastewater in the storage tank is sucked from the suction port together with the drainage and brought into contact with the ceramic having a surface active function to make an emulsified aqueous solution. It is conceivable to use a submersible pump means for discharging from the outlet.

  However, even if it is the structure using this submersible pump means, milk fat content sinks and accumulates in the bottom part of a storage tank, and there exists a possibility that the purification process of waste_water | drain cannot be performed appropriately.

  This invention is made | formed in view of such a point, and it aims at providing the waste water treatment apparatus which can purify | clean the waste water which contained many fats and oils appropriately.

The waste water treatment apparatus according to claim 1 is a storage tank in which waste water is stored, a first suction pipe that sucks floating oil and fat floating on the water surface of the waste water in the storage tank together with the waste water, and sinks in a bottom portion of the storage tank. A second suction pipe for sucking the precipitated oil and fat together with the waste water, a floating fat and oil sucked in the first suction pipe and the waste water into an emulsified aqueous solution, and the precipitated fat and oil sucked in the second suction pipe and An emulsifying means for making the waste water into an emulsified aqueous solution and a discharge pipe for discharging the emulsified aqueous solution generated by the emulsifying means into the storage tank are provided.

The wastewater treatment apparatus according to claim 2 is the wastewater treatment apparatus according to claim 1, wherein aeration means for supplying air to the wastewater in the storage tank and a house of aerobic microorganisms for purifying the wastewater in the storage tank. And coal having fine holes formed therein .

  The waste water treatment apparatus according to claim 3 is the waste water treatment apparatus according to claim 1 or 2, wherein an air supply pipe is connected to at least one of the second suction pipe and the discharge pipe.

  A wastewater treatment apparatus according to claim 4 is the wastewater treatment apparatus according to any one of claims 1 to 3, further comprising a submersible pump disposed in a storage tank, wherein the submersible pump includes a first suction pipe and a second suction pipe. A pipe and a discharge pipe are connected, and an emulsifying means is provided in the middle of the discharge pipe.

  According to the present invention, the floating oil and fat from the first suction pipe and the waste water can be made into the emulsified aqueous solution by the emulsification means, and the precipitated fat and oil from the second suction pipe can be made into the emulsified aqueous solution. Not only can it be prevented, but it can eliminate precipitated oil and fat, and can appropriately purify waste water containing a large amount of oil and fat.

  An embodiment of the present invention will be described with reference to the drawings.

  In FIG. 1, 1 is a waste water treatment apparatus, and this waste water treatment apparatus 1 is an apparatus for purifying waste water containing milk fat (oil and fat) and cow manure discharged from, for example, a milking facility.

  The waste water treatment apparatus 1 includes a tank body 4 that temporarily stores waste water that flows in from the inflow pipe 2 and causes the waste water after purification treatment to flow out from the outflow pipe 3 as treated water.

  The tank body 4 includes, for example, three tanks formed by partitioning with two partition plates 5 and 6, that is, a first processing tank 11 and a second processing tank 12 that are storage tanks in order from upstream to downstream. And a third treatment tank 13. The first treatment tank 11 and the second treatment tank 12 are communicated with each other through the upper communication part 14, and the second treatment tank 12 and the third treatment tank 13 are communicated with each other through the lower communication part 15.

  In the first treatment tank 11, a submersible pump 21, which is one pumping means, is disposed in the waste water in the first treatment tank 11.

  The submersible pump 21 sucks the floating milk fat, which is a floating oil and fat floating on the water surface of the wastewater in the first treatment tank 11 together with the drainage, when the submersible pump 21 is operated. Tube 23 is connected. The suction port portion 22 of the first suction pipe 23 opens upward near the water surface of the waste water in the first treatment tank 11. Further, the submersible pump 21 has a second suction pipe 25 that sucks the precipitated milk fat, which is the precipitated fat and oil that has sunk at the bottom of the first treatment tank 11, together with the drainage, when the submersible pump 21 is operated. It is connected. The suction port 24 of the second suction pipe 25 opens downward near the bottom of the first treatment tank 11. Further, a downstream end portion of an air supply pipe 26 that supplies air to the waste water flowing through the second suction pipe 25 is connected to the middle of the second suction pipe 25, and the upstream end portion of the air supply pipe 26 is 1 It is opened at a position on the surface of the waste water in the treatment tank 11. In the middle of the air supply pipe 26, a flow rate adjusting valve 27 for adjusting the amount of air flowing through the air supply pipe 26 is provided.

  The submersible pump 21 is provided with a flow path switching means (not shown), and the flow path switching means is controlled by a control means (not shown) having a timer function. Then, by the control by the control means, the floating oil suction state in which the floating milk fat and drainage are sucked from the first suction pipe 23 and the precipitated milk fat content from the second suction pipe 25 based on a preset set time. Further, switching to the precipitated oil suction state where the waste water is sucked is performed.

  The submersible pump 21 discharges an emulsified aqueous solution (emulsion) containing emulsified oil and fat from the discharge port 28 into the first treatment tank 11 toward the water surface of the drainage when the submersible pump 21 is operated. Tube 29 is connected. The discharge port portion 28 of the discharge pipe 29 is opened obliquely downward at a position on the water surface of the wastewater in the first treatment tank 11.

  Then, floating milk fat and waste water sucked in the first suction pipe 23 are put into the housing part 30 formed in the middle of the discharge pipe 29, that is, for example, on the submersible pump 21 side of the discharge pipe 29. In addition, emulsifying means for making the precipitated milk fat and the waste water sucked in the second suction pipe 25 into an emulsified aqueous solution, that is, for example, a ceramic 31 having a surface-active function, is accommodated therein.

  The ceramic 31 as the emulsifying means is made using, for example, ore and activated coal, and the floated milk fat sucked in the first suction pipe 23 when the flow path switching means is in the floating oil suction state, and These floating milk fat and waste water are made into an emulsified aqueous solution in contact with the waste water, and in the state where the precipitated oil is sucked in the flow path switching means, the precipitated milk fat and the waste water sucked in the second suction pipe 25 are contacted with these precipitated milk. Fat and waste water are made into emulsified aqueous solution. Then, the aqueous emulsified solution generated based on the catalytic action, physical phenomenon, surface active function, etc. by the contact with the ceramic 31 flows through the common discharge pipe 29 with respect to the two suction pipes 23 and 25 and is discharged. It is discharged from the exit part 28.

  The discharge pipe 29 is connected to the downstream end of an air supply pipe 26a for supplying air to the emulsified aqueous solution flowing through the discharge pipe 29. The upstream end of the air supply pipe 26a is connected to the first treatment tank 11. Open at a position on the surface of the drainage. The air supply pipe 26a is connected to, for example, two places of the pipe portion 29a of the discharge pipe 29 and the accommodating portion 30 via an orifice or the like. Note that the air supply pipe 26a may be connected to only one of the pipe part 29a and the accommodating part 30 of the discharge pipe 29.

  In the first treatment tank 11, aeration means 41 for supplying air to the waste water in the first treatment tank 11 is disposed. The aeration means 41 is constituted by, for example, an air diffusion pipe 43 that is horizontally disposed in the lower part of the first treatment tank 11 and has a large number of holes 42 formed therein. A pipe (not shown) is connected to the air diffusion pipe 43. An air pump 44 is connected via A flow rate adjusting valve (not shown) for adjusting the amount of air flowing through the pipe is provided in the middle of the pipe.

  Further, in the first treatment tank 11, porous activated coal 46 that serves as a source of aerobic microorganisms for purifying the wastewater in the first treatment tank 11 is contained in the wastewater in the first treatment tank 11. It arrange | positions so that it may be located above the diffuser tube 43. The activated coal 46 is, for example, formed by treating coal with dilute hydrochloric acid to form fine pores, and aerobic microorganisms are fixed in the fine pores, and the wastewater in an emulsified aqueous state by the fixed aerobic microorganisms or the like. The emulsified milk fat and the like are decomposed.

  The second treatment tank 12 receives and stores the waste water from the first treatment tank 11, and the waste water stored in the second treatment tank 12 is purified by aerobic microorganisms. In the second treatment tank 12, as with the first treatment tank 11, aeration means 51 for supplying air to the waste water in the second treatment tank 12 is disposed. The aeration means 51 is constituted by an air diffusion pipe 53 that is horizontally disposed in the lower part of the second processing tank 12 and has a large number of holes 52 formed therein. A pump 44 is connected. A flow rate adjusting valve 55 for adjusting the amount of air flowing through the pipe 54 is provided in the middle of the pipe 54.

  Also, in the second treatment tank 12, porous activated coals 56 and 57 that serve as a source of aerobic microorganisms for purifying the wastewater in the second treatment tank 12 are drained in the second treatment tank 12. It is arranged in two upper and lower stages so as to be located above the diffuser tube 53. These activated coals 56 and 57 are the same as the activated coal 46 in the first treatment tank 11, for example, in which coal is treated with dilute hydrochloric acid to form fine pores, and aerobic microorganisms are fixed in these fine pores. Then, the milk fat content that could not be processed in the first processing tank 11 is decomposed by the fixed aerobic microorganisms.

  The third treatment tank 13 receives and stores the waste water from the second treatment tank 12, and the waste water stored in the third treatment tank 13 is purified by cyanobacteria that propagate on the surface of the waste water and flows out. Out of the pipe 3 as treated water.

  In addition, as shown by a two-dot chain line in FIG. 1, a sterilizer 50 for disinfecting the waste water may be disposed in the third treatment tank 13. Five treatment tanks (disinfection tanks) may be provided. Further, instead of cyanobacteria, a drainage purification process may be performed by hydroponically cultivating a plant such as cabbage.

  On the other hand, as shown in FIG. 2, the wastewater treatment apparatus 1 includes a transparent house that covers at least the third treatment tank 13, that is, a transparent house 60 that covers, for example, the entire tank body 4. For this reason, in the 3rd processing tank 13, the inside of this 3rd processing tank 13 is set in the state suitable for the growth of cyanobacteria by water temperature adjustment and sunlight regardless of the change of the four seasons. Milk fat and the like that could not be processed in the processing tanks 11 and 12 are decomposed. Although not shown, only the third treatment tank 13 having an opening on the upper surface may be covered with a transparent house.

  Next, the operation of the waste water treatment apparatus 1 will be described.

  When the wastewater containing milk fat and cow manure flows through the inflow pipe 2 and flows into the first treatment tank 11, the milk fat content in the wastewater floats on the water surface and is separated in the first treatment tank 11. Further, the precipitated milk fat content is retained near the bottom of the first treatment tank 11.

  When the submersible pump 21 is activated, the floating milk fat component (floating oil component) is sucked from the suction port 22 of the first suction pipe 23 together with the drainage when the flow path switching means is in the floating oil suction state. An aqueous emulsified solution is generated in contact with the ceramic 31 in the housing portion 30, and the aqueous emulsified solution is discharged from the discharge port portion 19 of the discharge pipe 29. Further, when the flow path switching unit is in a state of sucking in the precipitated oil by the control of the control unit, the precipitated milk fat (precipitated oil and fat) is sucked together with the drainage from the suction port 24 of the second suction pipe 25 and accommodated in the discharge pipe 29. An emulsified aqueous solution is generated in contact with the ceramic 31 in the section 30, and this emulsified aqueous solution is discharged from the discharge port portion 19 of the discharge pipe 29.

  For this reason, the rot of the floating milk fat on the water surface of the waste water in the first treatment tank 11 is prevented, and the precipitated milk fat content does not remain at the bottom of the first treatment tank 11, so that the first treatment tank 11 The whole waste water in 11 is agitated, and the milk fat content and the like that are finely emulsified by this agitation are effectively decomposed by the aerobic microorganisms stagnant in the activated coal 46.

  In addition, since oxygen required for an aerobic microorganism is fully supplied by the air supply by the air supply pipes 26 and 26a and the air supply by the diffuser pipe 43 which is the aeration means 41, activation of the aerobic microorganism can be promoted. In addition, the chlorine-based disinfectant or cleaning agent in the waste water can be scattered by supplying air through the air diffuser 43.

  When the wastewater flows through the upper communication part 14 and flows into the second treatment tank 12, the milk fat and the like that could not be processed in the first treatment tank 11 in the previous process are activated in the second treatment tank 12. Decomposed by aerobic microorganisms stagnant in coals 56 and 57. In addition, the activation of aerobic microorganisms is promoted by supplying air through the air diffusing tube 53.

  Next, when the wastewater flows into the third treatment tank 13 from the lower communication part 15, in this third treatment tank 13, milk fat and the like remaining in the wastewater are decomposed by cyanobacteria and become treated water. And flows out from the outflow pipe 3.

  Thus, according to the waste water treatment apparatus 1, the floating milk fat and the waste water from the first suction pipe 23 can be made into an emulsified aqueous solution and the precipitated milk fat from the second suction pipe 25 by the ceramic 31 having a surface active function. Since the water and wastewater can be made into an emulsified aqueous solution, not only can the rot of the floating milk fat be prevented, but also the precipitated milk fat can be eliminated, and the wastewater containing a large amount of milk fat can be purified appropriately and efficiently. Therefore, for example, the tank body 4 can be reduced in size, and the manufacturing cost can be reduced.

  In the above embodiment, the configuration in which the tank body 4 includes the first processing tank 11, the second processing tank 12, and the third processing tank 13 has been described. For example, as shown in FIG. A configuration having only the first treatment tank 11 that is a tank may be used, and in this configuration, the treated water purified in the first treatment tank 11 flows out from the outflow pipe 3.

  Further, the submersible pump 21 is not limited to the configuration in which the flow path switching means is provided, and may not be provided with the flow path switching means, and may be sucked from both the first suction pipe 23 and the second suction pipe 25 at the same time. .

  Further, the configuration is not limited to the configuration in which the first suction pipe 23 and the second suction pipe 25 are connected to the common submersible pump 21, for example, a pump for sucking floating oil and fat into the first suction pipe 23, and the second suction pipe 25. A pump for sucking the precipitated oil and fat may be provided separately.

  Moreover, the waste water treatment apparatus 1 is applied to purification treatment of waste water containing a large amount of fat and oil discharged from restaurants, factories, etc., in addition to parlor waste water containing a large amount of milk fat discharged from milking facilities and the like. it can.

  Further, the configuration is not limited to the configuration in which the air supply pipes 26 and 26a are connected to both the second suction pipe 25 and the discharge pipe 29, and the configuration in which the air supply pipe 26 is connected only to the second suction pipe 25 or the air supply pipe. A configuration in which 26a is connected only to the accommodating portion 30 of the discharge pipe 29 may be employed.

It is a schematic sectional drawing of the waste water treatment equipment concerning one embodiment of the present invention. It is a schematic perspective view of a waste water treatment apparatus same as the above. It is a schematic sectional drawing of the waste water treatment equipment concerning other embodiments of the present invention.

Explanation of symbols

1 Wastewater treatment equipment
11 First processing tank that is a storage tank
21 Submersible pump
23 First suction pipe
25 Second suction pipe
26, 26a Air supply pipe
29 Discharge pipe
31 Ceramic as emulsifying means
41 Aeration means
46 Activated coal

Claims (4)

A storage tank in which wastewater is stored;
A first suction pipe for sucking together with drainage the floating oil and fat floating on the surface of the drainage in the storage tank;
A second suction pipe for sucking together with drainage the precipitated fat and oil that sinks to the bottom of the storage tank;
Emulsifying means for making the floating oil and fat sucked in the first suction pipe into an emulsified aqueous solution, and for making the precipitated fat and oil sucked in the second suction pipe into an emulsified aqueous solution,
A wastewater treatment apparatus comprising: a discharge pipe for discharging the aqueous emulsified solution generated by the emulsifying means into the storage tank. Aeration means for supplying air to the wastewater in the storage tank;
The wastewater treatment apparatus according to claim 1, further comprising coal having fine holes that serve as a home for aerobic microorganisms that purify the wastewater in the storage tank. The waste water treatment apparatus according to claim 1 or 2, wherein an air supply pipe is connected to at least one of the second suction pipe and the discharge pipe. It has a submersible pump arranged in the storage tank,
A first suction pipe, a second suction pipe and a discharge pipe are connected to the submersible pump;
The waste water treatment apparatus according to any one of claims 1 to 3, wherein an emulsifying means is provided in the middle of the discharge pipe.

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