JP2013158252A - Waste fluid treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a method for positively using organic substances drained from a factory for producing electric parts has little been discussed, although it has been discussed to degrade and release the organic substances with microorganisms.SOLUTION: Organic substances in a waste fluid are used as a feed to culture phytoplankton, and a fish bank is disposed in a sea close to a factory. The cultured phytoplankton is released in the fish bank. Thus, the waste fluid is used for growing marine resources. More specifically, a waste fluid treatment system is characterized by comprising a culture tank disposed in a factory to store culture water and phytoplankton, a mixing means for mixing an organic substances-containing waste water from the factory with the culture fluid to prepare a mixed waste fluid, a supply means for supplying the mixture waste fluid to the culture tank, a measurement means for counting the number of the phytoplankton in the culture tank, a carrying means for carrying the content of the culture tank to a place of natural water having the same salt degree as that of the culture fluid, and a fish bank containing a fish bank structure having at least one release port for releasing the content into sea.

Description

  The present invention relates to a processing system for waste liquid discharged from a manufacturing factory for electronic components and the like, and in particular nitrogen (N) and phosphorus (P) in the waste liquid is taken into plankton and returned naturally to the factory. Provide a treatment system for exhausted nitrogen and phosphorus.

  In a manufacturing factory for components such as electronic components, liquid crystal displays, and organic EL displays, various substances are used as raw materials and auxiliary materials in the manufacturing process. These materials are classified and processed in a predetermined way because they can affect the ecosystem when released naturally. For example, a substance containing a heavy metal element or a substance containing a radioactive element is processed as industrial waste.

  Nitrogen (N), phosphorus (P), and potassium (K) are said to be essential elements for the growth of autotrophic organisms that produce organic compounds from inorganic compounds by photosynthesis. Of these, nitrogen and phosphorus are used in large quantities in factories. For example, a chemical solution made of phosphoric acid or nitric acid is used in the process of making the metal wiring on the substrate.

  On the other hand, a large amount of materials composed of organic constituent elements such as carbon (C), hydrogen (H), oxygen (O), nitrogen (N), phosphorus (P), and silicon (Si) are also used in factories. The For example, an organic solvent is used for cleaning the surface of the substrate. In addition, if a process using photolithography is used, organic substances such as a resist and a release agent thereof are used. These may be usually burned and released as carbon dioxide, or wastewater treated by a system using denitrifying bacteria and nitrifying bacteria to decompose inorganic substances and return them naturally.

  Wastewater treatment releases organic matter into the environment as inorganic matter, such as nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, and phosphorous phosphorus. At this time, nitrogen and phosphorus are provided with a discharge standard and must be treated so as to satisfy the numerical value.

  By the way, as an industry using such a substance, there is a field in which marine resources are fertilized and marine resources are propagated. For example, Patent Document 1 and Patent Document 2 disclose inventions in which deep sea water is used to fertilize the sea area to promote the growth of marine resources such as seafood, or to regenerate contaminated sea areas.

JP 2003-158944 A JP 2001-299127 A

  In the above-mentioned patent documents, deep ocean water is used, but it is noted that deep ocean water contains a large amount of nitrate nitrogen or the like as a nutrient salt and is free from germs. On the other hand, even though such nutrients are discharged from factories, it cannot be said that these wastes are effectively used.

  The present invention has been conceived in view of the above-described problems, and effectively uses a substance that becomes a nutrient salt of marine organisms among the emissions from the factory. Specifically, phytoplankton is propagated with the emissions from the factory. Alternatively, zooplankton that ingests phytoplankton is grown. The plankton that has been propagated is released within a fishing reef in the seawater, thereby promoting the natural growth of seafood and contributing to increased production of marine resources.

More specifically, the waste liquid treatment system of the present invention is:
An aquaculture tank with aquaculture water and plankton stored in the factory or in the vicinity of the factory;
Mixing means for mixing the waste water containing nitrogen and phosphorus from the factory and the aquaculture water, and adjusting the mixed waste liquid;
Supply means for supplying the mixed waste liquid to the culture tank;
Plankton measuring means for measuring the number of plankton in the aquaculture tank;
A transport means for transporting the contents of the aquaculture tank to a natural water location having the same salinity as the aquaculture water;
It includes a fish reef including a fish reef structure having at least one discharge port for discharging the contents into the sea.

  The waste liquid treatment system is characterized in that the aquaculture water is seawater.

  Further, the culture tank has a chelating agent feeding means for feeding a chelating agent.

  The plankton includes phytoplankton.

  The aquaculture tank has at least two types for phytoplankton and zooplankton.

  Further, the culture tank has means for supplying gaseous components of nitrate nitrogen and nitrite nitrogen containing nitrogen components generated in the factory.

  The aquaculture tank has high-concentration oxygen gas supply means for supplying high-concentration oxygen gas (oxygen concentration of about 30%) generated when nitrogen gas is produced in the factory. It is.

  Further, the culture tank has a carbon dioxide gas supply means for supplying carbon dioxide gas contained in exhaust gas such as a boiler.

  The nutrients required for plankton growth can be obtained from the factory. Further, chelating agents that are effective in fixing these nutrient salts in plankton are often used as cleaning agents for substrates in factories.

  In addition, when using a process such as photolithography, which often dislikes oxidation of the substrate surface, nitrogen gas is produced from the atmosphere on the premises of the factory. During the production of this nitrogen gas, a high-concentration oxygen gas with an oxygen concentration of 30% can be obtained as an exhaust gas as a by-product.

  Since phytoplankton is grown using these materials, the factory side has the merit of being able to safely treat the waste, and the natural world has the merit of being able to increase resources.

It is a figure which shows the location relationship of the waste liquid processing system which concerns on this invention. It is a figure which shows the structure of the waste liquid processing system which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings, but the following description exemplifies an embodiment of the present invention and can be modified without departing from the spirit of the present invention.

  FIG. 1 is a diagram showing the location relationship of the waste liquid treatment system of the present embodiment. The factory 10 is assumed to be constructed near the beach. However, it is not particularly limited to the sea 11 and may be in the vicinity of a river. The aquaculture tank 20 is installed in the site of the factory 10 or between the factory 10 and the sea 11. In addition, it is preferable to make the culture tank 20 into an open-air state. From the factory 10, various usable resources 3 are sent together with the waste liquid, and after being subjected to various controls by the control device 50, they are put into the culture tank 20. The waste liquid is used as a nutrient for plankton in the aquaculture tank 20, and is useful for the growth of plankton.

  On the other hand, a fish reef 2 is provided in the seawater. Then, the plankton cultivated by the transportation means 300 is transported from the culture tank 20 and released within the fish reef 2. Then, the released plankton increases near the fish reef 2, and the seafood also proliferates accordingly. Next, the waste liquid treatment system 1 of the present invention will be described in more detail with reference to FIG.

  Culture water 21 and phytoplankton 22 are placed in the culture tank 20. The culture water 21 is seawater in this embodiment. However, when using plankton that grows in fresh water, river water may be used. The type of phytoplankton is not particularly limited, but when silicon (Si) is contained in the wastewater to be treated, diatoms such as Skeletonema costat and Chaetoceros sp are included. It is good to make it. This is because these phytoplankton use silicon for the skeleton, so that the waste liquid containing silicon is decomposed. Moreover, you may include the chlorella (chlorella) which is a green algae in the culture tank 20. FIG. This is because it has high photosynthetic ability and can be grown in large quantities if it has carbon dioxide, water, sunlight and a very small amount of inorganic substances.

  Some plankton have substances that are addictive or neurotoxic to humans. Therefore, it is preferable to avoid the types of plankton containing these already known harmful substances. This is because the marine resources that have been propagated will eventually be reused by humans.

  In addition, even if the above-mentioned useful plankton algae are introduced in large quantities in the reef 2 ignoring the ecosystem, the red tide and blue tide will be attracted and the ocean will be contaminated. It is necessary to. For example, ocean pollution can be prevented by measuring turbidity at a depth of about 1 m from the ocean surface using an absorptiometer. The turbidity at a depth of about 1 m from the ocean surface is affected by the temperature of seawater and dissolved oxygen in seawater. However, when the seawater temperature is high in August and September and the concentration of dissolved oxygen is low, the turbidity is about 1 m. By setting the turbidity to 6 ppm or less and 3 ppm or more, marine pollution can be prevented, and by introducing phytoplankton into the ocean, it increases in the vicinity of the fish reef 2 and is attracted to this, and seafood also proliferates.

  The aquaculture tank 20 is provided with seawater intake means 24. This can be achieved with a pump. This is because the culture tank 20 is exposed to the open air in order to acquire sunlight, and the seawater in the culture tank 20 may evaporate. The seawater intake means 24 is preferably provided with a sterilization means 25 for destroying germs, viruses and the like by a method such as ultraviolet irradiation on the taken seawater. This is because it may be possible to incorporate not only the mixed waste liquid of seawater and seawater, which will be described later, but also seawater alone. For example, adjustment of salinity in the culture tank 20 or the like.

  Waste liquid from the factory is mixed with seawater which is the aquaculture water 21, and adjusted as mixed waste liquid. This is done by the mixing means 26. For example, the mixing means 26 can be realized by mixing a predetermined amount of waste liquid and seawater in a tank of a predetermined capacity and supplying it to the culture tank 20. This is because the waste liquid has almost no impurities other than the materials used, and it is considered that substances such as natural minerals necessary for the growth of organisms are insufficient in the culture tank 20 over time. In addition, since the waste liquid contains almost no NaCl, if the culture water 21 is seawater, the salt content in the culture tank 20 may be depleted.

The components of the mixed waste liquid in the culture tank 20 are 25 g of NaCl, 7 g of MgSO ₄ , 0.7 g of KCl, 0.4 g of CaCl ₂ .2H ₂ O, and 0.4 g of ethylenediaminetetraacetic acid in 1 liter of the mixed waste liquid. .3.0 g, iron chloride 0.1 g, manganese chloride 0.2 g, boron 0.6 g, Mo 0.1 g, cobalt chloride 0.002 g to 0.003 g, vitamin 12 (sinoacobalamine, hydride (Xoxocobalamin) is contained in an amount of 0.04 to 0.02 μg, which enhances the activity and proliferation of plankton.

  Seawater taken for mixed drainage may use seawater intake means 24. When separately provided, it is desirable to provide the sterilization means 25 as well as the seawater intake means 24.

  In the aquaculture tank 20, plankton measuring means 28 for measuring the number of plankton is provided. This is to grasp the approximate number of plankton. Specifically, it can be realized by measuring the transmitted light intensity or absorbance of the cultured water 21. This is because when the amount of plankton per unit volume increases, the cultured water 21 becomes congested, so that its turbidity can be estimated from transmitted light intensity or absorbance and a calibration curve measured in advance.

The aquaculture tank 20 preferably has a chelating agent charging means 30. This is because the chelating agent has a function of promoting the fixation of plankton nutrients in the plankton body. The chelating agent is a substance that easily forms a complex, and in the factory, ethylenediaminetetraacetic acid or a salt thereof is used as a cleaning agent for Mg ²⁺ or Ca ^{2+ on} the substrate surface. The waste liquid after washing contains not only a chelating agent but also magnesium and calcium as minerals, and can be suitably used for plankton growth.

  In the factory 10, a nitrogen gas production device 32 is often provided. In the manufacture of electronic components, etc., oxidation of the substrate surface is often a problem. This is because the thin film formed on the substrate surface is easily peeled off when an oxide layer is present on the substrate surface. Therefore, in the factory 10 as described above, the nitrogen gas production device 32 is arranged in the site, and the nitrogen gas is procured in the factory site.

  The nitrogen gas production device 32 obtains nitrogen gas by concentrating nitrogen in the atmosphere. Therefore, a high concentration oxygen gas having an oxygen concentration of about 30% is discharged from the nitrogen gas production device 32. This high-concentration oxygen gas can also be used for plankton growth. Phytoplankton performs photosynthesis under sunlight during daytime, but breathes oxygen when the sun goes down. In other words, it is an ideal breeding environment for phytoplankton by soaking up sunlight during the day and supplying oxygen gas at night. The means for taking out the high-concentration oxygen gas from the nitrogen gas production apparatus 32 and supplying it to the culture tank 20 is referred to as oxygen gas supply means 31 (or high-concentration oxygen gas supply means 31). Of course, nitrogen is sent to the factory for use. Moreover, in the factory, in order to generate heat, combustion is performed, and carbon dioxide can be supplied into the aquaculture tank 20 from there. A means for this purpose is called carbon dioxide supply means 38.

  In addition, a gas containing nitrate nitrogen is generated from the step of using a large amount of concentrated nitric acid. These exhaust gases are collected and temporarily stored in the exhaust gas tank 35. The nitrogen gas supply means 33 can be configured by releasing this gas in the aquaculture tank 20 using the aeration device 34 or the like.

  Further, in the factory 10, a process of applying a functional material to form a thin film is often performed. Here, the solvent in the paint is finally dried and discharged. However, the solvent cannot be discharged into the atmosphere as it is. Therefore, condensation and recovery are performed. Therefore, there are many high heat sources and low heat sources in the factory 10. These are collectively referred to as the heat source 36. The heat from the heat source 36 may be used to control the water temperature of the culture tank 20.

  Specifically, a pipe formed of a material having high thermal conductivity is placed in the culture tank 20, and a heat medium from the heat source 36 is passed through the pipe. The heat medium may be water, for example. The heat exchange means 37 including the switching of the heat source 36 and the circulation of the heat medium is referred to.

  The aquaculture tank 20 is provided with a transportation means 300 for transporting plankton to the fish reef 2 in the sea together with the aquaculture water 21. The conveying means 300 can be constituted by only a pump and a discharge pipe, but it is desirable that the remaining liquid in the discharge pipe can be pushed out by the aquaculture water 21 without plankton. More specifically, the discharge pump (discharge pump) 40, the transport path (discharge pipe) 42, the flow meter 43 for measuring the flow rate in the discharge pipe 42, the seawater intake means 24, and the culture tank side switching The conveying means 300 is configured by the valve 44 and the discharge side switching valve 45. There may be a plurality of conveying means 300. This is because the fish reef 2 described later may be provided at a plurality of locations.

  As a means for transporting plankton to the fish reef 2 in the sea, a method of concentrating the plankton in the aquaculture tank 20 using a membrane and pumping it to the fish reef 2 through the discharge pipe 42 for discharge, Any method may be used such as a method of transporting by ship.

  This is because the cultured plankton is transported to the fish reef 2 to be described later, but it is considered that there is a distance from the factory 10 and the discharge pipe 42 cannot be filled with the capacity of the aquaculture tank 20 alone. Further, it is considered that plankton is discharged periodically. If plankton remains in the discharge pipe 42, the plankton remaining in the discharge pipe 42 may be killed when the discharge pipe 42 is not used. is there.

  Therefore, after discharging a predetermined amount of the contents in the culture tank 20, the remaining plankton in the discharge pipe 42 is pushed out with the culture water 21 obtained from the sea by the seawater intake means 24.

  The culture tank side switching valve 44 switches whether the liquid fed into the discharge pipe 42 is in the culture tank 20 or the seawater intake means 24. Further, the discharge side switching valve 45 switches whether the discharge port is a fish reef 2 described later or the sea before it.

  The fish reef 2 is provided in the sea near the factory 10. The installation location is desirably a location with a depth of about 10 to 20 m where there is a certain amount of tide flow and fish and fishery products are likely to live in. The shape of the fish reef 2 is not particularly limited, and the fish reef 2 is not limited to a block shape or a tetrapod shape, but may be other waste as long as it does not contaminate seawater. A model that forms the fish reef 2 is called a fish reef structure. A plurality of fish reef structures may be combined. Note that the discharge port 42o of the discharge pipe 42 is connected to at least one of the fish reef structures. This is to release plankton to the fish reef 2.

  The fish reef structure provided with the discharge port 42o may not have the same shape as the other fish reef structures, and may not be arranged at the same position as the other fish reef structures. This is because the plankton may be effectively retained in the fish reef 2 when the plankton is released from a position away from the fish reef 2 due to the flow of the tide. Therefore, the fish reef structure provided with the discharge port 42o may be a fixing means such as a rib or a bracket that only fixes the discharge port 42o of the discharge pipe 42 to the seabed.

  Further, the waste liquid treatment system 1 of the present invention may include a control device 50 for managing the whole. This is because the running cost can be reduced by automation to some extent. The control device 50 includes an illuminance meter 60 for observing the amount of sunlight hitting the cultivation tank 20, a water temperature meter 61 for detecting the water temperature in the cultivation tank 20, a dissolved oxygen meter 62 for measuring the oxygen amount in the cultivation water 21, and the cultivation water 21. A salinity meter 63 for detecting the salinity concentration, a water level meter 64 for detecting the water level in the culture tank 20, a pH meter 65 for measuring the pH in the aquaculture water 21, a plankton measuring means 28 for detecting the amount of plankton, and a seawater intake means 24 , Chelating agent charging means 30, sterilizing means 25, discharge pump 40, culture tank side switching valve 44, discharge side switching valve 45, nitrogen gas supply means 33, oxygen gas supply means 31, waste liquid 13 and culture water 21 are mixed. The mixing means 26 and the heat exchange means 37 are connected to each other and can be controlled. Further, display means 50d such as a display for displaying the results of these controls may be provided.

  Next, the operation of the above waste liquid treatment system 1 will be described. A predetermined phytoplankton 22 is placed in the aquaculture tank 20 together with the aquaculture water 21 and is bred. The phytoplankton 22 is provided with the waste liquid 13 containing organic matter from the factory 10 and the mixed waste liquid 14 obtained by the seawater intake means 24 and mixed with seawater.

  Moreover, the culture tank 20 is provided under the open-air, and the phytoplankton 22 grows while performing photosynthesis with sunlight while there is sunlight. When the illuminance meter 60 detects that sunlight has disappeared, or when the dissolved oxygen meter 62 detects that the oxygen in the aquaculture water 21 has decreased, the control device 50 uses the oxygen gas supply means 31. Then, oxygen is supplied into the aquaculture water 21. In addition, when it can be determined that sunlight is applied, carbon dioxide can be supplied from the carbon dioxide supply means 38. This is to activate photosynthesis.

  Further, when the water temperature of the cultured water 21 exceeds the predetermined temperature range by the water temperature gauge 61, the control device 50 adjusts the water temperature of the cultured water 21 to the predetermined temperature by the heat exchange means 37. In addition, when the water level meter 64 and the salinity meter 63 cause the amount and the salinity of the cultured water 21 to be out of the predetermined range, the seawater is supplied from the seawater intake means 24 into the aquaculture tank 20. In this way, the environment in the aquaculture tank 20 is managed uniformly regardless of the season and the amount of plankton. Further, a chelating agent may be added every predetermined period. When only seawater is supplied by the seawater intake means 24, it can be supplied through the mixing means 26 in a state where the waste liquid 13 does not enter.

  Further, when the pH of the aquaculture water 21 falls below a predetermined value by the pH meter 65, the control device 50 adjusts the pH to a predetermined pH by an alkaline agent (for example, KOH waste liquid) addition device (not shown).

  The control device 50 detects the degree of plankton growth by the plankton measuring means 28 and also detects the amount of waste liquid introduced into the aquaculture tank 20. Here, if the amount of plankton does not increase in proportion to the amount of waste liquid input, it can be determined that the aquaculture environment is not appropriate. The control device 50 preferably displays this information on the display means. Moreover, if it is a certain range, you may control to control the chelating agent injection | throwing-in means 30 and to increase the quantity of the chelating agent input.

  On the other hand, when the amount of plankton increases in proportion to the amount of waste liquid input, a predetermined amount of plankton is released together with the aquaculture water 21. In order to discharge plankton, seawater is first caused to flow through the discharge pipe 42 by the seawater intake means 24. The discharge side switching valve 45 is set to the underwater side. When the inside of the discharge pipe 42 is filled with seawater, the culture tank side switching valve 44 is then switched to the culture tank 20 side. Then, a predetermined amount of phytoplankton 22 is released together with the aquaculture water 21. This may be monitored by a drop in the water surface of the aquaculture tank 20 or may be measured by the discharge time.

  When the flow meter 43 determines that the phytoplankton 22 has reached the vicinity of the discharge side switching valve 45, the discharge side switching valve 45 is switched to the fish reef 2 side. By this operation, the phytoplankton 22 is released into the fish reef 2.

  Moreover, when discharge | release of predetermined amount is complete | finished, the culture tank side switching valve 44 is switched to the seawater intake means 24 side, and seawater is flowed until all the phytoplankton 22 in the discharge pipe 42 is sent out to the fish reef 2. On the other hand, since the culture water 21 is low in the culture tank 20, the mixed waste liquid 14 or seawater (culture water 21) is injected into the culture tank 20 by the mixing means 26 and the seawater intake means 24.

  By repeating this cycle, the factory 10 can naturally discharge the waste liquid 13 in place of the phytoplankton 22. In addition, when the amount of plankton to be released is large, it can be processed and processed into feed on the ground, so that the amount of plankton in the sea can be controlled. In particular, the present invention is characterized in that wastewater components such as nitrogen and phosphorus are not discarded directly into seawater, and it is considered that the explosion of plankton due to natural conditions can be suppressed. This also leads to the suppression of the occurrence of red tides.

  In the present embodiment, only the case where the plankton is phytoplankton has been described. However, edible phytoplankton or zooplankton (collectively referred to as zooplankton or the like) that feed on phytoplankton may be cultured.

  In this case, a culture tank for cultivating zooplankton and the like is separately provided for the culture tank for culturing phytoplankton. A part of the cultivated phytoplankton is used as food for zooplankton and the like. The release of the cultured zooplankton and the aquaculture environment may be the same as those in the above embodiment except for the chelating agent input means 30. This is because zooplankton and the like feed on phytoplankton.

  By treating the waste liquid in this way, the waste liquid treatment from the factory 10 can be effectively used to cultivate phytoplankton in the factory 10, rather than releasing poor nutrient wastewater to the river etc. through the purification equipment. By doing so, the ecological pyramid on fishery resources can be enlarged in a similar manner.

  The present invention can be suitably used as a waste liquid treatment system in a factory that discharges organic substances such as electronic components, liquid crystals, organic EL, and semiconductors.

DESCRIPTION OF SYMBOLS 1 Waste liquid processing system 2 Fish reef 3 Available resources 10 Factory 11 Sea 13 Waste liquid 14 Mixed waste liquid 20 Aquaculture tank 21 Aquaculture water 22 Phytoplankton 24 Seawater intake means 25 Sterilization means 26 Mixing means 28 Plankton measuring means 30 Chelating agent input means 31 Oxygen Gas supply means 32 Nitrogen gas production apparatus 33 Nitrogen gas supply means 34 Aeration apparatus 35 Exhaust gas tank 36 Heat source 37 Heat exchange means 38 Carbon dioxide supply means 40 Discharge pump 42 Discharge pipe 42o Discharge port 43 Flow meter 44 Culture tank side switching valve 45 Release side switching valve 50 Controller 50d Display means 60 Illuminance meter 61 Water temperature meter 62 Dissolved oxygen meter 63 Salinity meter 64 Water surface meter 65 pH meter 300 Conveying means

Claims (8)

An aquaculture tank with aquaculture water and plankton stored in the factory or in the vicinity of the factory;
Mixing means for mixing the waste liquid containing organic matter from the factory and the aquaculture water, and adjusting the mixed waste liquid;
Supply means for supplying the mixed waste liquid to the culture tank;
Plankton measuring means for measuring the number of plankton in the aquaculture tank;
A transport means for transporting the contents of the aquaculture tank to a natural water location having the same salinity as the aquaculture water;
A waste liquid treatment system comprising a fish reef including a fish reef structure having at least one discharge port for discharging the contents into the sea.   The waste liquid treatment system according to claim 1, wherein the aquaculture water is seawater.   3. The waste liquid treatment system according to claim 1, wherein the aquaculture tank has a chelating agent charging means for charging a chelating agent. 4.   The waste liquid treatment system according to any one of claims 1 to 3, wherein the plankton includes phytoplankton.   The waste liquid treatment system according to any one of claims 1 to 4, wherein there are at least two of the aquaculture tanks for phytoplankton and zooplankton.   The waste liquid treatment system according to any one of claims 1 to 5, further comprising nitrogen gas supply means for supplying nitrogen gas generated in a factory to the culture tank.   The high-concentration oxygen gas supply means for supplying the high-concentration oxygen gas generated when nitrogen gas is produced in the factory to the aquaculture tank is provided. Waste liquid treatment system described in 1.   The waste liquid treatment system according to any one of claims 1 to 7, further comprising carbon dioxide supply means for supplying carbon dioxide generated in the factory to the culture tank.