JPH05111698A - Rice washing waste water disposal equipment - Google Patents

Abstract

PURPOSE:To dry dehydrated sludge and to reutilize it for feed and manure. CONSTITUTION:A sludge drier 104 for drying dehydrated sludge by dry wind is provided in the rear stage of a dehydrator 96 in a rice washing waste water disposal equipment 67 which is constituted of a precipitation device 75, biological treatment devices 83, 84 and the dehydrator 96.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice washing wastewater treatment apparatus for treating wastewater generated by washing rice grains.

[0002]

2. Description of the Related Art A large amount of sugars, proteins, etc. are contained in rice washing wastewater generated in a large-scale rice cooking factory or a brewing factory,
If it is discharged as it is, the river will be polluted due to high nutrition. Therefore, a method is known in which activated sludge fungus or yeast is used to perform a washing wastewater treatment. In the wastewater treatment, a precipitate generated is dehydrated by a dehydrator to form a dehydrated cake.

[0003]

The dehydrated sludge formed by the dehydrator is incinerated or treated as industrial waste,
It was hardly reused. This invention is
It is an object of the present invention to provide a rice washing wastewater treatment device that can reuse dehydrated sludge formed in a rice washing wastewater treatment device that has not been reused as feed or fertilizer by efficiently performing a drying process.

[0004]

[Means for Solving the Problems] A settling device for separating washed rice sewage into a precipitate and a liquid, a biological treatment device for biologically treating the liquid with activated sludge fungus or yeast, and dehydration by dehydrating the precipitate. In a rice washing wastewater treatment device comprising a dehydrator for forming sludge, a sludge drying device for drying the dehydrated sludge with a drying air is provided in a subsequent step of the dehydrator.

[0005]

[Function] The rice rinsing wastewater is separated into a sediment and a liquid by a sedimentation device, the liquid is sent to a biological treatment device for biological treatment by activated sludge fungus or yeast, and the sediment is sent to a dehydrator to be dehydrated sludge. The formed and dehydrated sludge is placed in a sludge drying device, dried by a drying air, and processed into sludge having a predetermined water content.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flow chart of a rice washing wastewater treatment apparatus according to the present invention, FIG. 2 is a flow chart of a rice washing processing apparatus, and FIG.
Is a partial side sectional view of the agitation dryer, and FIG. 4 is a side view of the sludge dryer.

A supply hopper 2 of the rice washing processing apparatus 1 is connected to a mixing tank 4 via a rotary valve 3, and 5 is a level meter for keeping the water in the mixing tank 4 at a constant level.
The mixing tank 4 is provided with a supply pipe 13 of a rice washer / dewaterer 12 via a rice washer 11 including pumps 6, 7, 8 and switching valves 9, 10.
Have been contacted. The rice washing machine is not limited to the one used in this embodiment, and may be any of various types such as washing rice by stirring.

Next, the rice washing and dehydrating machine 12 will be described with reference to FIG. A motor 15 is attached to one side wall of a pedestal 14 of the rice washer / dewaterer 12, and a pulley 16 mounted on the motor 15 is connected to a pulley 19 mounted on a main shaft 18 via a belt 17. The pulley 20 is connected to a pulley 23 of a hollow rotary shaft 22 via a belt 21, and 24 is a tension pulley. The main shaft 18 is connected to a stirring body 26 via a connecting shaft 25, and a connecting body 27 attached to the stirring body 26 is connected to a rice washing cylinder 28. 29 is a rice washing chamber. A spiral blade 30 for lifting is attached to the outer periphery of the rice washing cylinder 28, and a dehydration chamber 32 is formed by the rice washing cylinder 28 and a perforated wall cylinder 31 surrounding the spiral blade 29. The perforated wall cylinder 31 is connected to the rotary shaft 22 via a rotary table 33, and the upper end of the spiral blade 30 communicates with a discharge gutter 35 via a discharge port 34. A nozzle 36 provided on the rice washing cylinder 28 faces the dehydration chamber 32, the nozzle 36 communicates with a water supply pipe 40 through a water storage chamber 37, a through hole 38, and a water supply passage 39, and 41 indicates a supply pipe 13 and a rice washing chamber 29. It is a supply route to communicate with. 42 is a discharge port for collecting and discharging dehydrated water, and the discharge port 42 communicates with a pump 45 via a discharge cylinder 43 and a solenoid valve 44.
An air shutter 47 is attached to a discharge tube 46 connected to the discharge gutter 35.
Is provided, and the lower portion of the discharge tube 46 is formed as a porous wall to which water droplets fall.

The discharge cylinder 46 of the rice washing / drying machine 12 is connected to the supply tank 48 of the stirring / drying machine 58. A stirring rotator 51 is rotatably mounted on a main shaft 50 rotatably provided in a perforated wall cylinder 49 provided side by side in a stirring dryer 58, and the main shaft 50 has a plurality of ventilation ports 52.
The stirrer 51 is provided with a jet port 53. The stirring chamber 51 and the perforated wall cylinder 49 form a drying chamber 54, and the main shaft 5
One end of 0 connects to the hot air generator 57 via the blower pipe 55 and the blower 56, and also connects the discharge gutter 59 of the stirring dryer 58 to the grain elevator 60.

Reference numerals 61 and 62 are water storage tanks, and the tank 6
1, 62 are connected to a water supply device (not shown) via a switching valve 63, and are connected to the washing and dehydrating machine 12 via a switching valve 64, and one of the switching valves 65 and 66 is connected to the mixing tank 4. The other is connected to the raw water tank 68 of the rice washing wastewater treatment device 67. Further, 69 is a concentration measuring device for measuring the concentration of water.

Next, the rice washing water treatment device 67 will be described with reference to FIG. In addition, the rice washing wastewater treatment device 67 shown in FIG.
Is a method in which the waste water from washing rice is treated with activated sludge and the clean water is discharged to the sewer. The raw water tank 68 is a tank for temporarily storing the washing water having a certain concentration, and the raw water tank 68 communicates with the aggregating reaction tanks 71 and 72 via a raw water measuring tank 70. The flocculation reaction tank 71 is a flocculation agent tank 73, and the flocculation reaction tank 72 is
Contact the flocculant tank 74, and
% Calcium chloride is stored, and coagulant bath 74 stores 0.05% sodium alginate.

The coagulation reaction tanks 71 and 72 are connected to a raw water adjusting tank 76 via a coagulating sedimentation tank 75, and 77 is a raw water adjusting tank 76.
Is a pump for pumping the raw water (primary treated water) to the PH adjusting tank 78, and 79 and 80 are water level gauges for detecting the water level of the raw water adjusting tank 76. The pH adjusting tank 78 communicates with the neutralizing agent tank 81 storing caustic soda, and the PH adjusting tank 78 is the measuring tank 8
It communicates with the aeration tank 83 via 2. The aeration tank 83 and the aeration tank 84 are partitioned by a partition wall 86 having an opening 85, and the raw water adjusting tank 76 and the air diffusers 87, 88, 89 provided in the aeration tanks 83, 84 communicate with the blower 90 to perform aeration. Tank 8
A heater 91 is provided at 3, 84.

The aeration tank 84 communicates with a settling tank 92 for solid-liquid separation of the aerated water, and the settling tanks 75 and 92, via a pump 93, temporarily store excess sludge of activated sludge.
Have been contacted. The activated sludge tank 94 communicates with the dehydrator 96 via the coagulation reaction tank 95, and connects with the coagulation agent tank 97 in which the coagulant (diatomaceous earth) is stored. Dehydrator 9
Reference numeral 6 includes a coating 98 that is rotatably mounted and a roller 99 that compresses sludge into dehydrated cake. 100 is a settling tank 92
Is a treated water tank for temporarily storing treated water (clean water) from the above, this treated water is used as washing water for the filter cloth 98 of the dehydrator 96, and the washing water is temporarily stored in the filtrate tank 101 and then the raw water adjusting tank Returned to 76.

The roller 99 of the dehydrator 96 is replaced by the sludge dryer 10.
The sludge dryer 104 rotatably mounts the perforated wall rotary cylinder 107 in the casing 106, and the spiral blade 108 is provided around the inner wall of the perforated wall rotary cylinder 107. An air supply device 110 whose lower side is opened to an air supply port 109 is faced in the multi-walled rotary cylinder 107, and a supply cylinder 111 is connected to a kerosene or gas combustor (not shown). The discharge end of the perforated wall rotary cylinder 107 faces the discharge gutter 112, and the exhaust cylinder 113 attached to the lower portion of the casing 106 is connected to a suction device (not shown).

Next, the operation of the above configuration will be described. Water is supplied from a water supply device (not shown) to the water storage tank 61 via the switching valve 63, and the water in the water storage tank 61 is poured into the mixing tank 4 via the switching valve 65. Mixing tank 4
When a certain level of water is stored therein, the white rice in the supply hopper 2 is intermittently discharged by the rotary valve 3 and put into the mixing tank 4 to be mixed with water. White rice is a rice washing machine 1
Although the rice is pre-washed by the pumps 6, 7, and 8 of No. 1, the number of passages of the pump is changed by adjusting the control device (not shown) according to the type of white rice. In other words, white rice, which is relatively easy to wash like fresh rice, passes only the pump 6 and the switching valve 9
Is switched to supply to the washing and dehydrating machine 12. In addition, if it is difficult to wash rice like old rice, pass pumps 6 and 7 and switch the switching valve 10 to supply it to the rice washing dehydrator 12. , Pump 6,
All of them are passed through and supplied to the washing and dehydrating machine 12.

The white rice sent to the rice washing and dehydrating machine 12 is supplied from the supply pipe 13 to the rice washing chamber 29 through the supply passage 41. When the motor 15 is activated, the rice washing cylinder 28 is about 1,500 to 2,
It rotates at 000 rotations, and the stirring body 26 rotates by the rotation, and the white rice supplied to the rice washing chamber 29 receives the rice washing action. By the washing action, the bran layer remaining in the white rice is separated and eluted, and the washed white rice is removed by the spiral blade 30 in the dehydration chamber 3
3 is pumped. At that time, the perforated wall cylinder 31 rotating about 100 rotations slower than the rice washing cylinder 28 performs a dehydration action, and the water containing the bran eluted from the white rice is discharged from the hole of the perforated wall cylinder 31. In the dehydration chamber 32, the initial dehydration is first performed in the lower part thereof, and then the nozzle 3 facing the dehydration chamber 32.
The white rice is rewashed by pouring water from No. 6, the adhering substances such as bran remaining on the surface of the white rice are removed, and the rewashed white rice is pumped and re-dehydrated. Then, the discharged waste water of washed rice is collected in the discharge port 42, flows down the discharge cylinder 43, and flows through the solenoid valve 44.
Is discharged and the pump 45 is operated to discharge it to the outside of the machine. Then, the drainage of the washed rice passes through the switching valve 79 and the water storage tank 76.
Is sent to the mixing tank 4 again via the switching valve 80 and circulated. After washing the rice, when washing the rice washing dehydrator 12, the air shutter 47 is closed to prevent the water from flowing to the subsequent steps, and then the water is supplied.

The dewatered white rice is pumped by the spiral blade 30 and discharged from the discharge port 35, and from the discharge gutter 35 to the discharge cylinder 4.
6 is made to flow down and is put into the supply tank 48 of the stirring dryer 58. The white rice put in the supply tank 48 is stored in the drying chamber 54.
Rotation of the stirring rotator 51 (peripheral speed 100 to 300 m /
By the stirring action of (minute), the polished rice is rubbed into particles and the surface of the rice grains is made smooth.

The outside air is heated by the hot air generator 57 to become hot air (60 ° C. or less), and the air blower 56 blows air into the blow pipes 55,
It is sent to the hollow main shaft 50 via 53. Hot air is the main shaft 5
The water adhering to the white rice (residence time is 5 to 10 seconds) jetted from the air outlet 53 to the drying chamber 54 through the 0 ventilation port 52 and agitated and flowed in the drying chamber 54 is dried. The dried white rice is sent from the discharge gutter 59 through the grain elevator 60 to the next step.

The water used for washing rice in the rice washing and dehydrating machine 12 is returned to the water storage tank 61 and is recirculated.
When the (biochemical oxygen demand) reaches about 8,000 PPM (which is judged by measuring the concentration of water by the concentration measuring device 69), the changeover valve 65 is changed over to the rice washing wastewater treatment device 67. Sent to the raw water tank 68. At that time, the switching valve 63 is switched, water is supplied from the water supply device (not shown) to the water storage tank 62, and the water is sent to the mixing tank 4 through the switching valve 66. Similarly, the BOD is about 8,
It is circulated until it reaches 000PPM. BOD is about 8.0
When the pressure reaches 00 PPM, the switching valve 66 is switched and the water is sent to the raw water tank 68. At this time, by switching the switching valve 63, water for washing rice is supplied to the water storage tank 61.

Waste rice washing water in the raw water tank 68 is sent to the raw water measuring tank 70, and is measured in the raw water measuring tank 70 (flow rate 1.25 m3 /
After that, it is supplied to the flocculation reaction tank 71, and excess waste water for washing rice is returned to the raw water tank 68. Calcium chloride is supplied from the flocculant tank 73 to the rice washing wastewater in the flocculation reaction tank 71 to cause the flocculation reaction. Addition of calcium chloride (300 PPM or more) promotes floc aggregation and improves floc recovery rate. The rice washing wastewater is sent from the flocculation reaction tank 71 to the flocculation reaction tank 72, and the flocculation reaction is similarly performed with sodium alginate (3 PPM) supplied from the flocculation agent tank 74. In addition, the residence time of the rice rinsing wastewater in the flocculation reaction tanks 71 and 72 is about 10 to 15 minutes. The rice rinsing wastewater that has undergone the flocculation reaction is sent to a flocculation sedimentation tank 75 for sedimentation and separation, and the sediment (sludge = sludge) is periodically sent by a timer to a sludge adjusting tank 94 by a pump 93 and the supernatant water (BOD). Is about 2,000 PPM or less) is a coagulating sedimentation tank 75
Overflows and is sent to the raw water adjusting tank 76. In addition, the residence time of the rice washing wastewater in the coagulation sedimentation tank 85 is approximately 2.5 to 3 hours, and when the sediment is accumulated for a time longer than the set time of the timer, the pump 93 is activated by the detection of the sludge sensor 111 to cause the sedimentation. The product is sent to the sludge adjusting tank 94.

The raw water adjusting tank 76 (capacity 7.5 m3) is
It is an intermediate adjustment tank to prevent the treatment capacity of activated sludge bacteria in the aeration tanks 88 and 89 from decreasing, and aeration and stirring is performed by the air (air amount 50 m3 / hour) sent from the blower 90 to the air diffuser 87. , We are trying to make the water quality uniform. When the water level meter 79 in the raw water adjusting tank 76 detects the raw water, the secondary treatment process after the raw water adjusting tank 76 (the pre-aggregation sedimentation tank 75 is the primary treatment process) is activated, and the water level indicator 80 detects the raw water. The primary processing process is stopped and an alarm is issued. The pump 77 is activated by the detection of the water level indicator 79, and a predetermined amount of raw water (primary treated water) is sent to the PH adjusting tank 78,
In the pH adjusting tank 78, the PH value of the primary treated water supplied to the aeration tanks 88 and 89 is automatically adjusted within a predetermined range (6.8 to 7.5). That is, when the PH value of the primary treated water is constantly measured by the PH meter 101 and becomes less than or equal to the set value (for example, the set value is 7) in the PH indicator adjuster (not shown), the caustic sorter in the neutralizer tank 81. Is supplied to the pH adjusting tank 78, and the PH value is corrected within a predetermined range.

The primary treated water is supplied to the aeration tank 88 through the measuring tank 82 after being adjusted to a PH value within a predetermined range, and the activated sludge bacteria and the inflow raw water (primary treated water) supplied to the aeration tank 88.
Are aerated and mixed by the air (air amount 50 m3 / hour) sent from the blower 90 to the air diffuser 88. Organic matter in the raw water is digested by the activated sludge bacteria, and the primary treated water is purified and treated into stable sludge with good sedimentation. The primary treated water of the aeration tank 88 is sent to the aeration tank 89,
The ratio of the amount of air that is aerated and mixed by the air sent from the blower 90 to the air diffuser 89 and is sent to the aeration tank 88 and the aeration tank 89 is about 6: 4. The heater 91 maintains the water temperature so that biological treatment can be stably performed, and in the winter, the heater 91 maintains the water temperature at about 15 ° C. (when the water temperature is 10 ° C. or less, the activated sludge bacteria are inactive).

The aerated water from the aeration tank 84 is sent to the settling tank 92 (capacity 2.5 m3), and the purified water is separated as supernatant water at the top of the tank and sludge at the bottom of the tank.
The separated sludge (almost all amount) is sent to the aeration tank 83 through the metering tank 82 by the air blow from the blower 90 and used for the activated sludge treatment, and the excess sludge accumulated periodically (about one year) is pumped by the pump 93. It is sent from the settling tank 92 to the sludge adjusting tank 94.

The precipitate from the coagulation-sedimentation tank 75 and the activated sludge from the sedimentation tank 92 are temporarily stored in the sludge adjusting tank 94 and then sent to the coagulation reaction tank 95 at a fixed amount (a flow rate of 300 l / hour). The coagulant in the coagulant tank 97 is added to the sludge in the coagulation reaction tank 95 to be coagulated, and the coagulation reaction tank 95
The more overflowed sludge (water content: about 99%) is supplied onto the filter cloth 98 of the dehydrator 96. The sludge is sucked by a suction device (not shown) in the dehydrator 96, and the sludge is removed.
Is compressed and discharged as a dehydrated cake. The supernatant water of the settling tank 92 is sent to the treated water tank 100, part of which is used as washing water for the filter cloth 98 of the dehydrator 99, and the other is discharged to the sewer. BOD of discharged water is 600PPM or less,
SS is 600PPM or less. The washing water that has washed the filter cloth 98 is sent to the filtrate tank 101 and then returned to the raw water adjusting tank 76.

Next, the operation of the sludge dryer 104 will be described.
Sludge 114 formed on the dehydrated cake by the dehydrator 96
(Length 200mm, width 20mm, thickness 5mm, moisture about 65-7
0%) flows down the supply gutter 105 and the perforated wall rotating cylinder 107
Be thrown into. The perforated wall rotary cylinder 107 is repeatedly rotated and stopped at intervals of 2 minutes, and when the perforated wall rotary cylinder 107 is in a stopped state, the sludge 114 is introduced and the surface of the sludge 114 is first solidified by the dry air. This is because when the perforated wall rotary cylinder 107 rotates when the sludge 114 is soft, the sludge 114
This is because the particles become spherical, the internal drying does not proceed and the drying time becomes long, and the high internal water content facilitates the decomposition. Then, the sludge 114 is intermittently conveyed in the perforated wall rotary cylinder 107 while being agitated by the spiral blades 108, and the dry air supplied from the combustor (not shown) through the cylinders 111 and 109. Hot air temperature 105 ℃
The drying air containing the moisture is discharged from the exhaust pipe 113 to the outside of the machine.
The sludge 114 has a residence time of about 30 in the perforated wall rotary cylinder 107.
The flow rate is 20 kg / hour, and the sludge 114 is dried to a water content of about 15%.

FIG. 5 shows another embodiment of the present invention. Below the casing 106, a belt conveyor 117 in which a belt 116 having a hole is stretched between rollers 115 is provided.
The operation is as follows.
The sludge 114 supplied onto 16 is dried by the dry air supplied from the air supply device 110 while being conveyed on the belt 116, and the dried sludge 114 is discharged from the discharge gutter 112 to the outside of the machine.

In the present embodiment, the biological treatment of the rice washing wastewater was treated with activated sludge bacteria, but the rice washing wastewater may be biologically treated with yeast such as polysaccharide-assimilating yeast. The sludge dryer is not limited to this embodiment, and may be any device that dries sludge.

[0028]

According to the rice washing wastewater treatment apparatus of the present invention, a sludge drying apparatus for drying dehydrated sludge by dry air is provided.
Due to the configuration provided in the subsequent process of the dehydrator, the dehydrated sludge that was conventionally incinerated or treated as industrial waste can be efficiently dried by the drying air and can be reused for feed, fertilizer, etc. You can

[Brief description of drawings]

FIG. 1 is a flow chart of a rice washing wastewater treatment device.

FIG. 2 is a flow chart of a rice washing processing apparatus embodying the present invention.

FIG. 3 is a partial side cross-sectional view of a stirring dryer.

FIG. 4 is a side view of a sludge dryer.

FIG. 5 is a side view of another sludge dryer.

[Explanation of symbols]

 1 Rice Washing Processing Equipment 2 Supply Hopper 3 Rotary Valve 4 Mixing Tank 5 Level Meter 6 Pump 7 Pump 8 Pump 9 Switching Valve 10 Switching Valve 11 Rice Washing Machine 12 Rice Washing Dewatering Machine 13 Supply Cylinder 14 Frame 15 Motor 16 Pulley 17 Belt 18 Spindle 19 Pulley 20 pulley 21 belt 22 rotary shaft 23 pulley 24 tension pulley 25 connecting shaft 26 stirring body 27 connecting body 28 rice washing cylinder 29 rice washing chamber 30 spiral blade 31 perforated wall cylinder 32 dehydration chamber 33 turntable 34 discharge port 35 discharge gutter 36 nozzle 37 water storage Chamber 38 Passage 39 Water supply channel 40 Water supply pipe 41 Supply path 42 Discharge port 43 Discharge cylinder 44 Solenoid valve 45 Pump 46 Discharge cylinder 47 Air shutter 48 Supply tank 49 Perforated wall cylinder 50 Main spindle 51 Stirring rotor 52 Vent hole 53 Jet port 54 Drying room 55 Blower tube 56 Blower 57 Hot air generator 58 Stirring drier 59 Discharge gutter 60 Grain lifter 61 Water storage tank 62 Water storage tank 63 Switching valve 64 Switching valve 65 Switching valve 66 Switching valve 67 Rice washing wastewater treatment device 68 Raw water tank 69 Concentration measuring device 70 Raw water measuring tank 71 Coagulation reaction tank 72 Coagulation reaction tank 73 Coagulant tank 74 Coagulant tank 75 Coagulation sedimentation tank 76 Raw water adjusting tank 77 Pump 78 PH adjusting tank 79 Water level meter 80 Water level meter 81 Neutralizer tank 82 Metering tank 83 Aeration tank 84 Aeration tank 85 Opening 86 Partition wall 87 Diffuser tube 88 Diffuser tube 89 Diffuser tube 90 Blower 91 Heater 92 Settling tank 93 Pump 94 Sludge adjusting tank 95 Coagulation reaction tank 96 Dewatering machine 97 Coagulant tank 98 Filter cloth 99 Roller 100 Treated water tank 101 Filtration tank 102 PH Total 103 Sludge sensor 104 Sludge dryer 105 Supply gutter 106 Casing 107 Perforated Wall Rotating Cylinder 108 Spiral Blade 109 Air Supply Port 110 Air Supply Device 111 Supply Cylinder 112 Exhaust Gutter 113 Exhaust Cylinder 114 Sludge 115 Roller 116 Belt 117 Belt Conveyor

Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location C02F 11/12 D 7824-4D C05F 7/00 301 Z 7057-4H (72) Inventor Shikadera Azuma Hiroshima Prefecture 2-30, Saijo Nishihonmachi, Hiroshima City Satake Factory

Claims (1)

[Claims] 1. A settling device for separating the rice rinsing wastewater into a precipitate and a liquid, a biological treatment device for biologically treating the liquid with activated sludge fungus or yeast, and dehydrating the precipitate to form dehydrated sludge. A rice washing wastewater treatment device comprising a dewatering device and a sludge drying device for drying the dewatered sludge with a drying air in a subsequent step of the dewatering device.