JP4611120B2 - Wastewater recycling system - Google Patents

Description

The present invention relates to a waste water recycling system that biological reaction treatment.

  Generally, a wastewater recycling system for treating organic factory wastewater is equipped with a wastewater treatment facility that biologically treats wastewater, and the wastewater treated in this wastewater treatment facility is separated from sludge and disinfected before being discharged. Is known (for example, see Patent Document 1). The factory wastewater treated and discharged in this way is discharged into sewage or rivers.

For example, even in a fish processing plant that processes seafood such as octopus and sea cucumber, cleaning wastewater generated after processing and washing seafood is processed by the wastewater recycling system. In addition, food residues of seafood are generated after processing, and in the current situation, such food residues of seafood are subjected to industrial waste processing by requesting a contractor.
JP 2003-136091 A

  In fisheries processing plants that process seafood, it is necessary to request a food residue treatment of seafood from a contractor, and industrial waste disposal costs are required. In addition, in a processing plant that discharges treated factory wastewater, a sewerage usage fee for sewage discharge is required. In addition, since the fishery processing plant performs primary cleaning of the processing plant floor, seafood and the like with clean water, a water usage fee for these cleaning is also required.

  This invention makes it a subject to aim at the cost reduction of industrial waste disposal costs, such as seafood, and the water supply fee used in a factory, and a sewerage usage fee.

The present invention has been made in the waste water recycling system in view of the above problems, its features, biological response processing waste water drainage food processing hall is introduced from the waste water regulation tank and the drainage regulating tank flowing A wastewater treatment facility comprising a biological reaction tank, a food residue treatment device that pulverizes food residues and supplies the wastewater adjustment tank, and wastewater treated in the biological reaction tank is separated from sludge and further processed. Treated water recycling facility to be reusable, treated water monitoring device for monitoring the quality of treated water reusable at the treated water recycling facility, and treatment to which treated water from the treated water monitoring device is supplied A water storage tank, and the treated water monitoring device samples the water quality monitoring tank into which the treated water treated in the treated water recycling facility is introduced, and the treated water in the water quality monitoring tank, When the water quality automatic measurement device that measures the water quality of the sample is compared with the measured water quality measurement value of the sampled water and the preset water quality standard value, and the water quality measurement value reaches the predetermined water quality standard value, And a control device for stopping the treated water in the water quality monitoring tank from being supplied to the treated water storage tank.

  In the wastewater recycling system of the present invention, food residues are decomposed by being ground to a paste of, for example, about 100 μm with a food residue treatment apparatus and put into a wastewater treatment facility. The treated water treated at the wastewater treatment facility can be used as the primary washing water at the processing plant by advanced treatment at the treated water recycling facility.

  In addition, there is a concern that the inflow load will increase due to the introduction of food residues into the wastewater treatment facility, but at the processing site at night after the end of processing work or when the inflow load during processing work is low, By appropriately introducing the residue, fluctuations in the inflow load can be suppressed.

The treated water storage tank of the wastewater recycling system of the present invention is provided with a water supply device that replenishes the treated water storage tank with clean water, and the control device uses water in the treated water storage tank for processing. When the water in the water storage tank becomes less than a predetermined amount, the water supply device controls the water to be supplied into the treated water storage tank. In such a case, stable water can be supplied from the treated water storage tank.

  The food residue treatment apparatus of the wastewater recycling system of the present invention includes a first residue pulverizing unit into which a food residue is charged, a second residue pulverizing unit that pulverizes a food residue more finely than the first residue pulverizing unit, A residue storage tank for storing the processing residue pulverized by the second residue pulverizing means; and a metering pump device for supplying a predetermined amount of the processing residue from the residue storage tank to the wastewater treatment facility. The food residue can be efficiently and quickly pulverized to a predetermined state by the first residue pulverizing means and the second residue pulverizing means, and a predetermined amount of the processing residue can be supplied to the wastewater treatment facility by the metering pump device.

  According to the present invention, the food processing residue is mixed with the raw water in the processing plant and disposed, so that the industrial waste disposal cost can be reduced. In addition, since the treated water can be used as the primary washing water in the processing plant, it is possible to reduce water and sewage usage charges.

  Embodiments of the present invention will be described with reference to the drawings. In the present embodiment, as a wastewater recycling system that performs sewage treatment by the continuous inflow intermittent aeration method, for example, an aquatic processing wastewater treatment system in a fishery processing plant that processes seafood such as octopus and squid.

  FIG. 1 is a diagram showing a schematic system of a fishery processing wastewater-in-water treatment system according to this embodiment. As shown in this figure, an aquatic processing wastewater-in-water treatment system 1 includes a wastewater treatment facility 2, a food residue treatment device 3, a treated water recycling facility 4, a treated water monitoring device 6, and a treated water storage tank 7. The main composition is.

  The wastewater treatment facility 2 includes a drainage adjustment tank 21 into which wastewater generated at a fishery processing plant (for example, wastewater from which seafood is washed or floor surface of a processing plant) is introduced, and the drainage adjustment tank 21 A biological reaction tank 23 into which drainage is introduced from the drainage adjustment tank 21 and a measuring device 27 that measures organic substances contained in the wastewater in the drainage adjustment tank 21 are provided by the installed drainage pump P1. This measuring device 27 is, for example, a TOC measuring device, and measures the value of TOC (Total Organic Carbon).

  The drainage liquid feed pump P1 and the biological reaction tank 23 of the drainage adjustment tank 21 are connected by a drainage liquid feed pipe 25. The drainage liquid feed pipe 25 has a belt screen 26 for removing foreign matters such as floating substances. Intervened.

  The biological reaction tank 23 controls internal dissolved oxygen (DO) by the aeration blower B1. As the biological reaction process, drainage denitrification and dephosphorization are performed by alternately switching between an anaerobic process for stopping the aeration blower B1 and an aerobic process for driving the aeration blower B1. In other words, the nitrogen compounds contained in the wastewater are oxidized by activated sludge in the aerobic process to become nitrate nitrogen, and then switched to the anaerobic process to remove oxygen from nitrate nitrogen and generate nitrogen gas. Denitrification is performed by Further, phosphorus is once released from the activated sludge in the anaerobic process, and thereafter, the phosphorus is removed by excessively collecting phosphorus in the activated sludge by switching to the aerobic process.

  The food residue treatment apparatus 3 includes a chopper 31 as a first residue grinding means, a grinder 32 as a second residue grinding means, a residue storage tank 33, and a metering pump device 34. The chopper 31 is a device that crushes the input food residue (seafood residue) to a predetermined roughness. The attritor 32 has a hopper 32a into which the seafood residue crushed by the chopper 31 is charged. It is.

  The residue storage tank 33 is a tank in which the processed residue ground by the grinder 32 is charged and the processed residue is stored. The metering pump device 34 is a device for supplying a predetermined amount of the treated residue in the residue storage tank 33 to the drainage adjustment tank 21.

  The treated water recycling facility 4 is a facility that separates the wastewater treated in the biological reaction tank 23 from sludge and further recycles it as intermediate water through advanced treatment. The membrane separation tank 40, the activated carbon raw water tank 41, the activated carbon An adsorption tower 42 and an ultraviolet sterilizer 43 are provided.

  The membrane separation tank 40 is provided with a membrane unit 45 in the tank. The membrane unit 45 has, for example, a configuration in which a plurality of flat membrane-shaped elements are arranged at intervals, and sludge and treated water can be separated into solid and liquid by this flat membrane. The shape of the membrane element constituting the membrane unit 45 may be a hollow fiber shape other than a flat membrane, and the membrane material may be either organic or inorganic. It is also possible to eliminate the need for a membrane separation tank by installing the membrane unit 45 in the biological reaction tank 23 and using a tubular membrane installed outside the tank.

  The membrane separation tank 40 and the biological reaction tank 23 are connected to each other by a drainage extraction pipe 50 and a drainage return pipe 51. The drainage pipe 50 is connected to the pump P2 of the biological reaction tank 23 so that sludge can be circulated between the membrane separation tank 40 and the biological reaction tank 23. The membrane unit 45 and the activated carbon raw water tank 41 are connected by a treated water take-out pipe 53 with a membrane filtration pump P3 interposed therebetween. Air is supplied as bubbles from the membrane blower B <b> 2 to the membrane unit 45 through the air supply pipe 55, and sludge is prevented from staying in the membrane unit 45.

  The activated carbon raw water tank 41 is provided with an activated carbon raw water pump P5, and the treated water stored in the activated carbon raw water tank 41 is supplied to the activated carbon adsorption tower 42 via the treated water transfer pipe 56 by the activated carbon raw water pump P5. The activated carbon adsorption tower 42 is an apparatus that adsorbs and removes trace organic components (hereinafter referred to as trace organic components) that could not be processed in the biological reaction tank 23 such as odor and color from the supplied treated water. The treated water discharged from the activated carbon adsorption tower 42 is sterilized with a chemical solution in the chemical tank 45 before being introduced into the ultraviolet sterilizer 43 through the treated water transfer pipe 57. When the sterilized treated water flows through the apparatus, the ultraviolet sterilizer 43 irradiates the treated water with ultraviolet rays, thereby sterilizing bacteria in the water and purifying the treated water. .

  The treated water monitoring device 6 includes a water quality monitoring tank 60 connected to the ultraviolet sterilizer 43 through a treated water transfer pipe 58 and a water quality automatic measuring device 61. The water quality monitoring tank 60 is provided with a sampling pump P 6, and the sampling pump P 6 supplies treated water in the water quality monitoring tank 60 to the water quality automatic measuring device 61 via the sampling water pipe 62. The treated water in the water quality monitoring tank 60 is subjected to highly accurate water temperature control by the chiller unit 63. The water quality monitoring tank 60 is connected to the treated water storage tank 7 by a middle water pipe 65 with a cold water transfer pump P7 interposed therebetween, and the treated water in the water quality monitoring tank 60 is supplied to the treated water storage tank 7. It is like that. The treated water in the treated water storage tank 7 is supplied in an amount corresponding to the use in the processing plant.

  The automatic water quality measuring device 61 samples the treated water in the water quality monitoring tank 60 and constantly measures its properties. The automatic water quality measuring device 61 is provided with a control device 66 that controls the activated carbon raw water pump P5, the cold water transfer pump P7, and the metering pump device 34. In other words, the control device 66 compares the measured water quality measurement value of the sampled water with a preset water quality reference value, and if it is determined that the water quality measurement value has reached the water quality reference value, the activated carbon raw water pump P5 And the cold water transfer pump P7 is stopped, and the input of the treated water to the treated water storage tank 7 is stopped.

  Further, the control device 66 compares the measured TOC value obtained based on the information from the TOC measuring device 27 with the set TOC value, and the measured TOC value substantially matches the set TOC value or the set TOC. A predetermined range is given to the value, and the metering pump device 34 is controlled so that the measured TOC value falls within the range, thereby adjusting the amount of treatment residue input to the drainage adjustment tank 21.

  The treated water storage tank 7 is connected with a water supply pipe 70 so that clean water can be appropriately supplied from a water supply device 75. The water pipe 70 is provided with an electromagnetic valve 71, and the electromagnetic valve 71 is normally closed. Further, the water in the treated water storage tank 7 is supplied to the activated carbon adsorption tower 42 through the treated water return pipe 72 by the operation of the backwash pump P8 and used for backwashing. The operation of the solenoid valve 71 and the backwash pump P8 can be performed by the control device 66.

  Next, processing steps of the fishery processing wastewater-in-water treatment system having the above-described configuration will be described with reference to FIG.

When the food processing plant is not operated for 24 hours First, the seafood residue charging process will be described. The worker inputs the seafood residue generated at the food processing plant into the chopper 31. After the seafood residue is pulverized by the chopper 31, it is crushed to about 100 μm or less by a grinder 32 and automatically put into the residue storage tank 33. The operation of putting the seafood residue into the chopper 31 is performed for a predetermined time (for example, at the time of cleaning after completion of the operation).

  The factory cleaning wastewater generated at the food processing plant appropriately flows into the wastewater adjustment tank 21. At this time, the TOC measuring device 27 installed in the drainage adjustment tank 21 measures the amount of inflowing organic matter, and the control device 66 is based on the information, and the residue ground according to the wastewater treatment load from the food processing plant Adjust the input amount. Specifically, the TOC measuring device 27 measures the TOC value, and the information is sent to the control device 66. The control device 66 compares the measured TOC value obtained based on the information with the set TOC value. . When the measured TOC value reaches the set TOC value (when the measured TOC value is greater than or equal to the measured value), the control device 66 determines that the wastewater treatment load (inflow load) from the food processing plant is large, and the metering pump device 34 is By controlling, the amount of treatment residue in the residue storage tank 33 to the drainage adjustment tank 21 is reduced or stopped.

  When the measured TOC value does not reach the set TOC value (if less), the control device 66 determines that the wastewater treatment load from the food processing plant is small, and the treatment residue in the residue storage tank 33 is metered into the metering pump. A certain amount is supplied to the drainage adjustment tank 21 by the device 34. In such a case, the processing residue is supplied until the measured TOC value substantially matches the set TOC value, or the metering pump device 34 is controlled within the range of the set TOC value. Thereby, the inflow load to the drainage adjustment tank 21 can be made uniform, and stable biological treatment can be performed.

  Next, the biological treatment process and the treated water purification process will be described. Drainage in the drainage adjustment tank 21 (which may include processing residues supplied from the residue storage tank 33) is supplied to the biological reaction tank 23 by the wastewater feed pump P1. In the biological reaction tank 23, denitrification and dephosphorization processes are performed by biological reaction treatment with activated sludge. Only the treated water is filtered from the sludge introduced into the membrane separation tank 40, and the treated water is introduced into the activated carbon raw water tank 41. The treated water in the activated carbon raw water tank 41 is supplied to the activated carbon adsorption tower 42, and the activated carbon adsorption tower 42 effectively removes and removes trace organic components. The treated water from which the trace organic substance component has been removed is sterilized by the ultraviolet sterilizer 43 after being sterilized with chlorine.

  Next, the treated water monitoring process will be described. The treated water sterilized by the ultraviolet sterilizer 43 is introduced into the water quality monitoring tank 60. The water quality automatic measuring device 61 samples the treated water in the water quality monitoring tank 60. The control device 66 determines that the water quality is good when the measured quality value of the treated water does not reach (below) the water quality reference value, and continues to supply the treated water to the treated water storage tank 7. .

  In addition, when the control device 66 determines that the measured water quality value has reached (or is more than) the water quality reference value, the control device 66 stops the input of the treated water into the treated water storage tank 7. Since treated water is not supplied to the treated water storage tank 7, when the amount of water in the input treated water storage tank 7 becomes less than a predetermined amount, the electromagnetic valve 71 is opened to replenish water to a predetermined amount. . In addition, when the processing residue is input to the drainage adjustment tank 21, the control device 66 controls the metering pump device 34 to stop the processing residue input to the drainage adjustment tank 21.

  At night when the food processing plant stops operating and there is no inflow of drainage into the drainage adjustment tank 21, the measured TOC value does not reach the set TOC value. Therefore, the control device 66 controls the metering pump device 34 and grinds it during the daytime. The processing residue in the residue storage tank 33 is automatically supplied to the drainage adjustment tank 21 in a fixed amount. Thereby, even if the food processing plant has stopped the operation, the inflow load into the drainage adjustment tank 21 can be made uniform, and stable drainage treatment can be performed.

  When the food processing plant is operated for 24 hours, the cleaning wastewater always flows into the drainage adjustment tank 21. The control device 66 controls the metering pump device 34 in the same manner as described above to adjust the amount of treatment residue input to the drainage adjustment tank 21, thereby making the inflow load into the drainage adjustment tank 21 uniform and stable drainage treatment. It can be carried out.

  Water is required to grind food residues and clean the equipment, but the water used here uses treated water in the treated water storage tank 7 obtained from this system as intermediate water. Further, since the treated water in the treated water storage tank 7 is used as a primary cleaning water for a floor surface or the like in the food processing plant, it is possible to reduce water and sewerage usage charges. In addition, since the food residue is disposed as waste water in the food processing plant and mixed with the cleaning wastewater, the industrial waste disposal cost can be reduced.

  Note that the present invention is not limited to this, and in the above-described embodiment, the treated water treated in the biological reaction tank 23 is filtered by the membrane separation tank 40. The waste water recycling system is not limited to the above embodiment. Moreover, the processed food is not limited to seafood such as octopus and squid.

It is a figure showing a schematic structure of an aquatic processing drainage middle water treatment system of one embodiment concerning the present invention. It is a figure which shows the flow of the same fisheries processing wastewater middle water treatment system.

Explanation of symbols

1 Fishery processing wastewater wastewater treatment system (drainage recycling system)
2 Wastewater treatment facility 3 Food residue treatment device 4 Treated water recycling facility 6 Treated water monitoring device 7 Treated water storage tank 31 Chopper (first residue grinding means)
32 Mill (second residue grinding means)
33 Residue storage tank 34 Metering pump device 66 Control device

Claims (3)

A wastewater treatment facility comprising a wastewater adjustment tank into which wastewater in the food processing plant flows and a biological reaction tank that biologically treats the wastewater introduced from the wastewater adjustment tank;
A food residue treatment apparatus for crushing food residue and supplying the wastewater adjustment tank;
A treated water recycling facility that separates wastewater treated in the biological reaction tank from sludge and further treats it for reuse.
A treated water monitoring device for monitoring the quality of treated water reusable at the treated water recycling facility;
A treated water storage tank to which treated water of the treated water monitoring device is supplied,
The treated water monitoring device includes a water quality monitoring tank into which treated water treated at the treated water recycling facility is introduced, and samples the treated water in the water quality monitoring tank, and measures the quality of the sampled water. The measurement device compares the measured water quality value of the sampled water with a preset water quality reference value, and when the measured water quality value reaches a predetermined water quality reference value, the treated water in the water quality monitoring tank And a control device for stopping the supply of water to the treated water storage tank.   A water supply device for replenishing the treated water storage tank is provided, and the control device uses water in the treated water storage tank so that the water in the treated water storage tank is less than a predetermined amount. The waste water recycling system according to claim 1, wherein the water supply device controls the water to be supplied into the treated water storage tank.   The food residue treatment apparatus includes a first residue pulverizing unit into which a food residue is charged, a second residue pulverizing unit that further finely pulverizes the food residue by the first residue pulverizing unit, and a pulverization by the second residue pulverizing unit. The waste water recycling system of Claim 1 or 2 provided with the residue storage tank which stores the processed residue, and the metering pump apparatus which supplies the predetermined amount of processing residue from this residue storage tank to the said waste water treatment facility.

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