JP2010253400A - Device for controlling ph increase using photosynthesis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for controlling pH increase using photosynthesis which can safely control pH increase at a low cost without using chemicals. <P>SOLUTION: The device for controlling pH increase using photosynthesis includes: a container 2 in which aquatic plants having chloroplasts are fixed and into which sewage to be treated after a final sedimentation basin flows in a sewage treatment process; a pH measuring means 4 for measuring the pH value of the sewage to be treated flowing into the container 2; an opening/closing means 5 of the container 2; an illuminance measuring means 10 for measuring illuminance in the container 2; and a controller 3 for controlling lighting into the container 2 by controlling the opening/closing means 5 of the container 2 to control the opening/closing of the container 2 when the illuminance measured by the illuminance measuring means 10 is higher than a reference value and the pH value measured by the pH measuring means 4 is lower than a set value. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pH increase control device using photosynthesis of sewage using an ion concentration gradient by photosynthesis of chloroplasts.

  In the quality standard of sewage drained into public sewers in Japan, there is a regulation of hydrogen ion concentration (pH value). As a solution when the pH value falls below the regulation value due to fluctuations in sewage water quality, it is for pH adjustment. There is a chemical injection method. In this method, as described in [Patent Document 1], the injection rate of the chemical for pH adjustment is obtained from the difference between the actually measured pH value and the target set value, and the injection is performed based on the injection rate. The value is optimized.

  In [Patent Document 2], the intermediate treated water from the sedimentation tank or the aeration second chamber is led to a sludge reformer in which lactic acid bacteria, photosynthetic bacteria, actinomycetes, yeast, etc. are proliferated in a balanced manner in the treated sludge. A sewage treatment method is described in which sewage treatment is efficiently performed by a useful microorganism group.

JP 2004-243277 A JP 2008-6351 A

  The conventional technique described in [Patent Document 1] has a problem that the running cost is high because chemicals are added for pH adjustment. The conventional technology described in [Patent Document 2] is configured to control an amount of sludge to be gradually increased with reference to pH, MLSS, OPR measurement values, SV, and the like so as to gradually increase the amount of the sedimentation tank withdrawn and returned. Need to be adjusted so that the environment is suitable for the activity and growth of useful microorganisms, maintenance work such as soil bacterial carrier replacement is necessary, and the amount of intermediate treated water is not large There is.

  An object of the present invention is to provide a pH increase control device using photosynthesis that does not require the use of chemicals and that can control pH increase safely at low cost.

  In order to achieve the above object, the pH increase control device using photosynthesis of the present invention is a container in which an underwater plant having a chloroplast flows into which treated sewage after the final sedimentation basin flows in a sewage treatment step. And a pH measuring means for measuring the pH value of the treated sewage flowing into the container, a container opening / closing means, an illuminance measuring means for measuring the illuminance in the container, and the illuminance measured by the illuminance measuring means is a reference value When the pH value measured by the pH measuring means is lower than the set value, the controller is provided with a controller that controls the opening and closing means of the container to control the opening and closing of the container, thereby controlling the lighting in the container. .

  In addition, when the illuminance measured by the illuminance measuring means is higher than the reference value and the pH value measured by the pH measuring means is lower than the set value, the container opening / closing means is controlled to control the opening and closing of the container. The amount of carbon dioxide injected is controlled by means of daylighting and carbon dioxide injection means.

  Further, when the pH value measured by the pH measuring means is lower than the set value, the lighting device is turned on using the energy stored by the solar power generation device provided with the battery, and the lighting in the container is controlled. It is.

  Further, when the pH value measured by the pH measuring means is lower than the set value, the lighting device is turned on using the energy stored by the solar power generation device provided with the battery, and the lighting in the container and the carbon dioxide injection are performed. The amount of carbon dioxide injection is controlled by availability.

  When the illuminance measured by the illuminance measuring means is higher than the reference value and the pH value measured by the pH measuring means is lower than the set value, the container opening / closing means is controlled to control the opening / closing of the container, and the battery is provided. The lighting device is turned on using the energy stored by the solar power generation device, and the lighting in the container is controlled.

  In addition, when the illuminance measured by the illuminance measuring means is higher than the reference value and the pH value measured by the pH measuring means is lower than the set value, the container opening / closing means controls the opening / closing of the container, and the solar power generation provided with the battery. The lighting device is turned on using the energy stored in the device, and the amount of carbon dioxide injected is controlled by the lighting into the container and the carbon dioxide injection means.

  According to the present invention, it is possible to control the increase in pH without using a chemical for pH adjustment, and it is possible to reduce the running cost. Moreover, the apparatus which does not discharge | emit carbon dioxide can be comprised by providing a solar power generation device.

The block diagram of the pH rise control apparatus using the photosynthesis which is one Example of this invention. The main process flow figure of a present Example. The carbon dioxide injection process flow figure of a present Example. The lighting lighting process flow figure of a present Example.

  In this example, in the sewage treatment step, as a countermeasure when the pH value of the treated sewage after the final sedimentation basin is lower than the reference value, the pH increase due to the photosynthesis reaction of the underwater plant with chloroplasts is used. It is a device for pH control. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a pH increase control device using photosynthesis of the present embodiment. As shown in FIG. 1, the treated sewage 1 flowing from the final sedimentation basin passes through the pH measuring means 4 and flows into a container 2 in which an underwater plant having a chloroplast is fixed. The pH measuring means 4 is connected to the controller 3.

  An illuminating device 7 and an illuminance measuring means 10 are installed in the container 2, and the illuminating device 7 is connected to the solar power generator 9 and the illuminance measuring means 10 is connected to the controller 3. The solar power generation device 9 is provided with battery remaining amount measuring means 8, and the battery remaining amount measuring means 8 is connected to the controller 3.

  Carbon dioxide gas injection means 6 is connected to the container 2, carbon dioxide gas injection means 6 is provided with carbon dioxide remaining amount measurement means 11, and carbon dioxide gas residual amount measurement means 11 is connected to controller 3, A control signal is input to the carbon dioxide gas injection means 6. A container opening / closing means 5 is installed in the upper part of the container 2 and is controlled to be opened and closed by a control signal from the controller 3.

  In the controller 3, the pH value measured by the pH measuring unit 4, the remaining battery level measured by the remaining battery level measuring unit 8, the remaining carbon dioxide level measured by the remaining carbon dioxide level measuring unit 11, and the illuminance measurement The container 2 in which the illuminance of the container measured by the means 10 is calculated as an input value, the container opening / closing means 5, the carbon dioxide gas injecting means 6, and the lighting device 7 are controlled to fix the underwater plant having chloroplasts. Perform daylighting and carbon dioxide injection. By controlling the amount of light collected into the container 2 and the amount of carbon dioxide injected, the increase in pH value caused by the photosynthetic reaction occurring in the chloroplasts of the underwater plant is promoted or stopped. The treated sewage 1 treated by the pH increase control device is sent to the disinfection tank.

  FIG. 2 is a main process flow chart of control in the controller 3. This main process flow chart is a flowchart for controlling whether or not to take in external light by opening and closing the container opening / closing means 5 with the pH value of the treated sewage 1 measured by the pH measuring means 4 as an input value.

  In step 201, it is determined whether or not the measured pH value measured by the pH measuring means 4 is smaller than the pH target value. If the measured pH value is smaller than the pH target value, step 202 and Proceed to 208.

  In step 208, it is determined whether or not the actual illuminance value measured by the illuminance measuring means 10 is smaller than the illuminance reference value. If the actual illuminance value is smaller than the illuminance reference value, the process starts from step 202. Even if the process of step 205 is being executed, the process proceeds to step 206.

  In step 202, a container opening command is output from the controller 3 to the container opening / closing means 5, the container opening / closing means 5 performs a container opening operation in step 203, and if it is determined in step 204 that the container is fully opened, the process proceeds to step 205. . The pH of the sewage 1 to be treated is increased by taking outside light into the container 2 in which the underwater plants having chloroplasts are immobilized by the container opening / closing means 5 and causing the underwater plants to undergo photosynthesis reaction.

  In step 205, it is determined whether the measured pH value measured by the pH measuring means 4 is larger than the pH target value. If the measured pH value is larger than the pH target value, the process proceeds to step 206. That is, the container opening / closing means 5 is opened until the pH value of the treated sewage 1 falls within the normal value range, and the pH increase due to the photosynthesis reaction is continued.

  In step 206, when a container closing command is output from the controller 3 to the container opening / closing means 5, the container opening / closing means 5 performs a container closing operation in step 207, and if it is determined in step 208 that the container is fully closed, End.

  When the container is fully closed, the external light is blocked in the container 2 in which the underwater plant having chloroplasts is immobilized, and the increase in pH is suppressed by inhibiting photosynthesis. By repeating the main process, it is possible to increase the pH of the treated sewage 1 whose pH is lowered and the water quality is inclined to be acidic without using chemicals, and to maintain the measured pH value within an appropriate range.

In addition to the main process flow for controlling the opening and closing of the container opening and closing means 5, injection of CO ₂ required for the photosynthesis reaction can promote the pH increase.

FIG. 3 is a carbon dioxide injection process flow diagram for promoting pH increase by CO ₂ injection. In step 301, when the operator instructs carbon dioxide injection, the controller 3 outputs a carbon dioxide injection command to the carbon dioxide injection means 6, and the process proceeds to steps 302, 305, and 304.

  In step 304, the carbon dioxide injection means 6 starts carbon dioxide injection. Carbon dioxide injection can be continued as long as the remaining amount of gas exceeds the lower limit.

  In step 305, it is determined whether or not the gas remaining amount actual measurement value measured by the carbon dioxide remaining amount measuring means 11 is smaller than the gas remaining amount lower limit value. If it is smaller, the process proceeds to step 303 even if the process of step 302 is being executed.

  In step 302, it is determined whether or not the measured pH value measured by the pH measuring means 4 is larger than the pH target value. If the measured pH value is larger than the pH target value, the process proceeds to step 303. That is, carbon dioxide gas is injected until the pH value of the treated sewage 1 falls within the normal value range, and the pH increase due to a more efficient photosynthesis reaction is continued than when carbon dioxide gas is not injected.

  In step 303, a carbon dioxide gas stop command is output from the controller 3 to the carbon dioxide gas injection means 6, and when the carbon dioxide gas injection is stopped in step 306, the process ends. The carbon dioxide gas injection process flow is executed when the measured illuminance value measured by the illuminance measuring means 10 is larger than the illuminance reference value.

  FIG. 4 is a lighting device lighting process flow diagram. The illumination device 7 is turned on when the pH does not increase even in the processing by the main process shown in FIG. 2, when it is desired to increase the pH in a short time, or when natural light is difficult to collect such as in bad weather or at night.

  The photosynthesis reaction requires light energy, and the reaction is not performed if the illuminance is insufficient. Therefore, the photosynthesis reaction is promoted by turning on the lighting device 7. Moreover, the power supply for lighting the illuminating device 7 is supplied by a solar power generation device 9 provided with a battery, thereby realizing power feeding that does not discharge carbon dioxide.

  In step 401, when the lighting is instructed by the operator, an illumination lighting command is output from the controller 3 to the lighting device 7, and the process proceeds to steps 404, 405 and 402.

  In step 404, the lighting device 7 is turned on. The lighting can be continued as long as the remaining battery level exceeds the lower limit. In step 405, it is determined whether or not the battery remaining amount measured value measured by the battery remaining amount measuring means 8 is smaller than the battery remaining amount lower limit value. If it becomes smaller, the process proceeds to step 403 even if the process of step 402 is being executed.

  In step 402, it is determined whether or not the measured pH value measured by the pH measuring means 4 is larger than the pH target value. If the measured pH value is larger than the pH target value, the process proceeds to step 403. That is, the lighting is turned on until the pH value of the treated sewage 1 falls within the normal value range, and the pH increase due to the photosynthesis reaction is continued.

  In step 403, an illumination extinction command is output from the controller 3 to the illumination device 7, and when the illumination is extinguished in step 406, the process ends.

1 treated sewage 2 container 3 controller 4 pH measuring means 5 container opening / closing means 6 carbon dioxide injecting means 7 lighting device 8 battery remaining amount measuring means 9 solar power generation device 10 illuminance measuring means 11 carbon dioxide remaining amount measuring means

Claims (6)

  In the sewage treatment step, a container in which an underwater plant having chloroplasts flows into which treated sewage after the final sedimentation basin flows, and a pH measuring means for measuring the pH value of the treated sewage flowing into the container The container opening / closing means, the illuminance measuring means for measuring the illuminance in the container, the illuminance measured by the illuminance measuring means is higher than a reference value, and the pH value measured by the pH measuring means is higher than a set value. A pH increase control device using photosynthesis, comprising a controller that controls the opening and closing of the container to control the opening and closing of the container and controlling the daylighting into the container when the temperature is low.   In the sewage treatment step, the container in which the treated sewage after the final sedimentation basin flows, the chloroplast-containing underwater plant immobilized thereon, the carbon dioxide gas injection means into the container, the container opening and closing means, Illuminance measuring means for measuring the illuminance of the container, pH measuring means for measuring the pH value of the treated sewage flowing into the container, and the illuminance measured by the illuminance measuring means is higher than a reference value, and the pH measuring means When the measured pH value is lower than a set value, the controller controls the opening and closing means of the container to control the opening and closing of the container, and controls the amount of carbon dioxide injected by the lighting and carbon dioxide injection means into the container PH increase control device using photosynthesis provided with.   In a sewage treatment process, a container in which an underwater plant having a chloroplast flows into which treated sewage after the final sedimentation basin flows, a solar power generation device including a battery, and an illumination device that illuminates the inside of the container PH measurement means for measuring the pH value of the sewage to be treated flowing into the container, and when the pH value measured by the pH measurement means is lower than a set value, is stored by the solar power generation device provided with the battery A pH increase control device using photosynthesis, comprising a controller for lighting the lighting device using energy and controlling the daylighting into the container.   In a sewage treatment process, a container in which an underwater plant having a chloroplast flows into which treated sewage after the final sedimentation basin flows, a solar power generation device including a battery, and an illumination device that illuminates the inside of the container The pH value measured by the pH measuring means for measuring the pH value of the treated sewage flowing into the container, the illuminance measuring means for measuring the illuminance of the container, the carbon dioxide injection means, and the pH value measured by the pH measuring means is a set value. A controller for turning on the lighting device using energy stored by a solar power generation device equipped with a battery and controlling the amount of carbon dioxide injected by the daylight into the container and the carbon dioxide injecting hand when lower PH increase control device using photosynthesis provided.   In a sewage treatment process, a container in which an underwater plant having chloroplasts flows into which treated sewage after the final sedimentation basin flows, a container opening / closing means, a solar power generation device including a battery, and the container An illumination device that illuminates the interior, a pH measurement unit that measures the pH value of the treated sewage flowing into the container, an illuminance measurement unit that measures the illuminance of the container, and the illuminance measured by the illuminance measurement unit is a reference When the pH value measured by the pH measurement means is lower than a set value, the energy stored by the solar power generation apparatus including the battery is controlled by controlling the container opening and closing means to open and close the container. The pH increase control apparatus using photosynthesis provided with the controller which lights the said illuminating device using and controls the lighting in the said container.   In a sewage treatment process, a container in which an underwater plant having chloroplasts flows into which treated sewage after the final sedimentation basin flows, a container opening / closing means, a solar power generation device including a battery, and the container The illuminance measured by the illumination device for illuminating the interior, the pH measurement means for the inflow water to the container, the illuminance measurement means for measuring the illuminance of the container, the carbon dioxide injection means, and the illuminance measurement means is more than the reference value. When the pH value measured by the pH measuring means is lower than a set value, the opening / closing control of the container is performed by the container opening / closing means, and the lighting device is operated using the energy stored by the solar power generation device including the battery. A pH increase control device using photosynthesis, which is provided with a controller that is lit and controls the amount of light in the container and the amount of carbon dioxide injected by the carbon dioxide injection means.

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