JP3398924B2 - Wastewater treatment equipment for kitchen waste - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposer which is a device for crushing various kinds of food materials, such as cooking garbage and garbage, while adding a small amount of water and crushing the garbage. The present invention relates to an apparatus for discharging waste water containing kitchen waste. 2. Description of the Related Art A conventional apparatus for treating garbage-containing sewage is a crusher for crushing solids in garbage-containing sewage, and fixing anaerobic microorganisms to garbage-containing sewage containing the crushed material in the crusher. An anaerobic decomposition tank that anaerobically decomposes in the presence of a bed, an aerobic treatment tank that aerobically treats the treated water anaerobically decomposed in the anaerobic decomposition tank in the presence of a fixed bed of aerobic microorganisms, and the aerobic treatment tank. There is an apparatus provided with a means for returning excess sludge or the like for returning the trapped or generated suspended matter or excess sludge to the anaerobic decomposition tank. [0003] With the above-mentioned structure, the solid garbage crushed by the disposer is solubilized in a liquid state by the anaerobic microorganisms, and the anaerobic treated water is treated by the aerobic microorganisms in the aerobic treatment zone. Then, the BOD load is reduced. Suspended substances and excess sludge that floated by aeration in the aerobic treatment means are returned to the anaerobic decomposition zone, and the treatment is repeated again. Generally, garbage containing garbage is crushed by adding a small amount of water to a garbage such as cooking garbage of various food materials and garbage such as garbage, and discharged from the kitchen. . In particular, fine solids in garbage-containing sewage contain a large amount of organic matter, so that BOD value and S
If the S value is very high and discharged without sufficient treatment,
Pollution problems such as water pollution will occur. Therefore, oxidative decomposition treatment methods such as the activated sludge method and the biofilm method have been conventionally performed.
A sufficient effect cannot be obtained, and in recent years, the above-described conventional processing apparatus has been developed. However, in the above-mentioned conventional apparatus,
Suspended substances and excess sludge trapped or generated in the aerobic treatment tank are returned directly to the anaerobic decomposition tank, and are only anaerobically decomposed again and released, eliminating the work of collecting excess sludge. In this case, the excess sewage and the like must be reduced to almost zero by the anaerobic decomposition again. However, surplus sludge and the like are naturally generated even by a large amount of aerobic bacteria generated during the aerobic treatment, and cannot be completely eliminated. The sludge is accumulated in the anaerobic decomposition tank, the aerobic decomposition tank, and the anaerobic decomposition tank. Both aerobic decomposition tanks have to be cleaned, and maintenance of both tanks is difficult. In addition, naturally, undegraded sludge is also included in the treated water discharged. In view of the above, the present invention provides anaerobic decomposition by concentrating undegraded precipitates such as suspended sludge and excess sludge and collecting them in one place, and recovering the concentrated excess sludge and other precipitates. It is not necessary to clean tanks, aerobic decomposition tanks, and solid-liquid decomposition tanks, so that maintenance and management of the equipment is easy, and the treated water discharged is clear and does not cause pollution such as water pollution. It is intended to provide. [0008] In order to solve the above problems, the apparatus of the present invention comprises a crusher for crushing kitchen garbage while adding a small amount of water, and an anaerobic sewage containing crushed material from the crusher. An anaerobic decomposition tank that performs anaerobic decomposition in the presence of a fixed bed of anaerobic microorganisms, and the treated water anaerobically decomposed in the anaerobic decomposition tank is subjected to aerobic treatment in the presence of a fixed bed or a fluidized bed where aerobic microorganisms grow and propagate. An aerobic decomposition tank, a solid-liquid separation tank that precipitates suspended substances and suspended solids, excess sludge, and the like in the treatment water of the aerobic decomposition tank, and discharges supernatant water to the outside; and a sediment in the solid-liquid separation tank. And a transfer means for extracting and transferring a part of the treated water, and storing a part of the precipitate and the treated water transferred by the transfer means,
A sludge concentration digestion tank for separating the supernatant water and returning the supernatant water to the aerobic decomposition tank to concentrate the precipitate is provided. According to the present invention, according to the present invention, kitchen waste discarded from a kitchen is pulverized by a pulverizer while adding a small amount of water, and sewage containing the pulverized material is liquefied and decomposed by anaerobic microorganisms in an anaerobic decomposition tank. . The treated water liquefied and decomposed in the anaerobic decomposition tank is oxidatively decomposed by the aerobic microorganisms that grow and propagate in the fluidized bed or the fixed bed in the aerobic decomposition tank, and the BOD load is reduced. Next, suspended solids and suspended matter in the treated water subjected to aerobic decomposition treatment in the solid-liquid separation tank, excess sludge, etc. are precipitated,
The supernatant water is discharged outside. [0010] The suspended solids and suspended solids precipitated in the solid-liquid separation tank and a part of the treated water such as excess sludge and the treated water are again filtered in the sludge concentration and digestion tank by the transfer means, and undegraded excess sludge is removed. Is concentrated and deposited, and the supernatant water is filtered again, separated and returned to the aerobic decomposition tank, so that no precipitate such as excess sludge is deposited in the solid-liquid separation tank and returned. Only the filtered supernatant water is introduced into the aerobic decomposition tank, and no excess sludge is mixed. After the aerobic decomposition is performed again, the supernatant water is discharged from the solid-liquid separation tank.
It becomes clear drainage without S generation. [0011] Since only the sludge concentration and digestion tank has precipitates such as surplus sludge which has been concentrated by the re-filtration process, only the work of collecting the precipitate in the sludge concentration and digestion tank needs to be performed. Since the anaerobic decomposition tank, the aerobic decomposition tank, and the solid-liquid separation tank do not need to be cleaned, maintenance is facilitated. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the processing apparatus of the present invention. In the figure, reference numeral 1 denotes a sink of a cooking place, and a pulverizer 2 such as a disposer is installed at the bottom of the sink 1. Reference numeral 3 denotes a drainage flow pipe disposed between the crusher 2 and the anaerobic decomposition tank 4, and garbage containing garbage containing pulverized material crushed by the crusher 2 is introduced into the anaerobic decomposition tank 4 from the sewage flow pipe 3. Is done. Reference numeral 5 denotes an anaerobic microorganism fixed bed provided in the anaerobic decomposition tank 4. The anaerobic microorganism fixed bed 5 is filled with a large number of polyurethane foam carriers as porous carriers to carry anaerobic microorganisms. In addition, kitchen waste water is liquefied and decomposed by anaerobic microorganisms. Reference numeral 6 denotes an overflow port through which the treated water liquefied and decomposed in the anaerobic decomposition tank 4 flows out into the aerobic decomposition tank 7 in the first chamber. The anaerobic decomposition tank 4 and the aerobic decomposition tank 7 in the first chamber are provided. Above the partition wall 8. Reference numeral 9 denotes an aerobic microorganism fixed bed provided in the aerobic decomposition tank 7 of the first chamber. The aerobic microorganism fixed bed 9 is filled with a large number of polyurethane foam carriers as porous carriers. Is carried. Further, a second chamber is disposed adjacent to the first aerobic decomposition tank 7.
An aerobic decomposition tank 10 is installed in the room, and the same aerobic microorganism fixed bed 9 as before is installed inside. A communication port 12 communicating with both the first and second aerobic decomposition tanks 7 and 10 is provided below a partition wall 11 between the first and second chambers. Reference numeral 13 denotes an air diffuser provided at the bottom of the aerobic decomposition tank 7 in the first chamber and the aerobic decomposition tank 10 in the second chamber, and is maintained in an aerobic state by air sent from the air pump 14. The treated water liquefied and decomposed in the anaerobic decomposition tank 4 is oxidatively decomposed by the aerobic microorganism. Reference numeral 15 denotes an advection port through which the treated water oxidized and decomposed in the aerobic decomposition tank 10 in the second chamber flows out to an adjacent solid-liquid separation tank 16, and 17 discharges gas such as odor generated in the aerobic decomposition tank. The gas passing through the deodorizing device 18 is discharged to the outside. In the drawings, the aerobic microorganisms in the aerobic decomposition tank are in a fixed bed, but may be in a fluidized bed. Reference numeral 19 denotes a filtration layer provided in the solid-liquid separation tank 16. Excess sludge and the like in the oxidized and decomposed treated water precipitate at the bottom. The treated water is filtered by the filtration layer 19 and the supernatant water is solid-liquid. It is discharged outside through a discharge pipe 20 provided in the separation tank 16. Reference numeral 21 denotes a transfer pipe for sludge or the like for transferring a precipitate such as excess sludge settled in the solid-liquid separation tank 16 and a part of the treated water to a sludge concentration digestion tank 23 by a pump 22. A filtration layer 24 filled with a filter medium such as a polyurethane foam carrier, which is a porous carrier, is provided in the sludge concentration digestion tank 23, and a part of the sediment and treated water transferred from the solid-liquid separation tank 16 is removed. The stored supernatant water is separated and returned to the aerobic decomposition tank 7 of the first chamber via a separation water transfer pipe 25 via a filtration layer 24,
After undergoing aerobic treatment again, it is filtered again and discharged to the outside. According to the present invention, the garbage is crushed by a crusher, and the garbage containing the garbage containing the crushed material is anaerobically decomposed, then aerobically decomposed, and solid-liquid separated suspended substances, suspended Waste, excess sludge, etc. and a part of the treated water are transferred to a sludge concentration and digestion tank, and the excess sludge, etc. are filtered again, and the concentrated sludge is stored. Since it is treated, filtered, and discharged, the BOD load is reduced, clear water without SS is generated, and there is no water pollution and no pollution problem. In addition, since sediments such as suspended solids, suspended solids, and excess sludge accumulate only in the sludge concentration digestion tank in a concentrated state, there is no need to clean the anaerobic decomposition tank, the aerobic decomposition tank, and the solid-liquid separation tank at all. In addition, only the work of collecting the precipitate in the sludge thickening digestion tank is required, and the maintenance and management of the processing apparatus becomes very easy as compared with the related art.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the processing apparatus of the present invention. [Description of Signs] 1 sink 2 crusher 3 drainage pipe 4 anaerobic decomposition tank 5 anaerobic microorganism fixed bed 6 overflow 7 aerobic decomposition tank in first room 8 partition wall 9 aerobic microorganism fixed bed 10 second room Aerobic decomposition tank 11 partition wall 12 communication port 13 air diffuser 14 air pump 15 transfer port 16 solid-liquid separation tank 17 exhaust gas pipe 18 deodorizer 19 filtration layer 20 discharge pipe 21 transfer pipe 22 pump 23 sludge concentration digestion tank 24 filtration layer 25 Separation water transfer pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B09B 3/00 C02F 3/30 C02F 11/00-11/20 C02F 3/00 C02F 3/02-3 / Ten

Claims (1)

(57) [Claims] [Claim 1] A crusher for crushing kitchen garbage while adding a small amount of water, and sewage containing crushed material from the crusher is anaerobically digested in the presence of an anaerobic microorganism fixed bed. An anaerobic decomposition tank for decomposing, an aerobic decomposition tank for aerobically treating the treated water anaerobically decomposed in the anaerobic decomposition tank in the presence of a fluidized bed or a fixed bed in which aerobic microorganisms grow and propagate, A solid-liquid separation tank that precipitates suspended substances and suspended solids, excess sludge, and the like in the treated water of the decomposition tank and discharges the supernatant water to the outside, and pulls out and transfers the precipitate in the solid-liquid separation tank and part of the treated water. Transfer means, and store a part of the precipitate and treated water transferred by the transfer means,
An apparatus for treating garbage-containing sewage, comprising a sludge concentration and digestion tank for separating supernatant liquid and returning it to the aerobic decomposition tank to concentrate precipitates.