System for neutralizing ammonia-containing waste liquid and method for neutralizing ammonia-containing waste liquid

Abstract

To provide a system for neutralizing ammonia-containing waste liquid, capable of efficiently neutralizing ammonia-containing waste liquid. [Solution] A neutralization treatment system 100 for ammonia-containing waste liquid neutralizes waste liquid WF containing ammonia AM. The neutralization treatment system 100 for ammonia-containing waste liquid includes one or more sludge tanks 700, a sludge discharge line 160 that supplies the waste liquid WF to the sludge tank 700, a neutralizing agent supply line 170 that supplies a neutralizing agent N to the sludge tank 700, and a sensor 720 that measures the pH of the waste liquid WF or the ammonia concentration of the waste liquid WF.

Description

[Technical field]

[0001] The present invention relates to a system for neutralizing an ammonia-containing waste liquid and a method for neutralizing an ammonia-containing waste liquid. [Background technology]

[0002] As a measure to combat global warming, ammonia fuel, which does not emit carbon dioxide, a greenhouse gas, during combustion, has been attracting attention as a promising energy source for realizing a carbon-neutral society. In recent years, the practical application of ammonia-burning gas turbines and ammonia-burning engines that use liquid ammonia as fuel has been progressing. Development is also underway to operate ammonia-fueled ships that use liquid ammonia as fuel, so-called zero-emission ships.

[0003] However, when liquid ammonia is used as fuel for ships, etc., unburned ammonia gas in the engine dissolves in the water in the lubricating oil. The water is mixed into the lubricating oil due to humidity during operation or condensation after the engine is stopped. If the engine is operated without removing the water, the ammonia concentration in the engine increases and the ammonia dissolves in the water in the lubricating oil. There is a problem in that materials exposed to ammonia water or an ammonia atmosphere are easily corroded. For this reason, lubricating oil containing ammonia is disposed of as waste liquid.

[0004] Such waste liquid containing ammonia is collected in a collection tank or neutralized (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6934555 [Patent Document 2] Patent No. 3863610 Summary of the Invention [Problem to be solved by the invention]

[0006] Since the space available for installation of recovery tanks and the like is limited on ships and at land-based power plant facilities, it is desirable to be able to neutralize waste liquid containing ammonia more efficiently.

[0007] Therefore, an object of the present invention is to provide a system for neutralizing an ammonia-containing waste liquid and a method for neutralizing an ammonia-containing waste liquid, which can solve the above-mentioned problems and efficiently neutralize the waste liquid containing ammonia. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides Sludge and other wastes were collected from lubricating oils used in marine diesel engines. Ammonia at least The waste liquid contained Separate the waste liquid A system for neutralizing an ammonia-containing waste liquid, comprising: a purifier for purifying the lubricating oil; One or more sludge tanks; a sludge discharge line for supplying the waste liquid separated from the lubricating oil by the purifier to the sludge tank; The sludge tank is provided with a neutralizing agent supply line for supplying a neutralizing agent to the sludge tank, and a sensor for measuring the pH of the waste liquid or the ammonia concentration of the waste liquid.

[0009] In addition, the present invention A system for neutralizing an ammonia-containing waste liquid, which separates a waste liquid containing at least sludge and ammonia from lubricating oil used in a marine diesel engine, and neutralizes the waste liquid, The above A purifier for purifying lubricating oil and one or more waste tanks; a sludge discharge line for supplying the waste liquid separated from the lubricating oil by the purifier to the waste liquid tank; From the waste tank The above A sludge tank for storing waste liquid; In the waste liquid tank The waste liquid The sludge tank the waste liquid tank includes a waste liquid discharge line for supplying a neutralizing agent to the waste liquid tank, and a sensor for measuring the pH of the waste liquid in the waste liquid tank or the ammonia concentration of the waste liquid. The present invention also provides a system for neutralizing an ammonia-containing waste liquid, which separates sludge and ammonia water from lubricating oil after use in a marine diesel engine, and neutralizes a waste liquid containing at least the sludge and the ammonia water, The above The system comprises a purifier for purifying the lubricating oil, one or more waste liquid tanks, a sludge discharge line for supplying the sludge separated from the lubricating oil by the purifier to the waste liquid tank, a heavy liquid discharge line for supplying the ammonia water separated from the lubricating oil by the purifier to the waste liquid tank, a neutralizing agent supply line for supplying a neutralizing agent to the waste liquid tank, a sensor for measuring the pH of the waste liquid in the waste liquid tank or the ammonia concentration of the waste liquid, and a sludge tank for storing the waste liquid discharged from the waste liquid tank.

[0010] The present invention also provides a system for neutralizing an ammonia-containing wastewater, which separates sludge and ammonia water from lubricating oil after use in a marine diesel engine, and neutralizes a wastewater containing at least the sludge and the ammonia water, comprising: a purifier for purifying the lubricating oil; The system comprises one or more sludge tanks, a sludge discharge line that supplies the sludge separated from the lubricating oil by the purifier to the sludge tank, a heavy liquid discharge line that supplies the ammonia water separated from the lubricating oil by the purifier to the sludge tank, a neutralizing agent supply line that supplies a neutralizing agent to the sludge tank, and a sensor that measures the pH of the waste liquid in the sludge tank or the ammonia concentration of the waste liquid. The present invention also provides a method for producing a semiconductor device comprising the steps of: Sludge and other waste from lubricating oil used in marine diesel engines Ammonia at least The waste liquid contained Separate the waste liquidA method for neutralizing an ammonia-containing waste liquid, comprising the steps of: The lubricating oil is purified by a purifier, and the waste liquid separated from the lubricating oil by the purifier is supplied to one or more waste liquid tanks through a sludge discharge line. The pH or ammonia concentration of the waste liquid is measured by a sensor, and a neutralizing agent is added to the waste liquid to neutralize the waste liquid depending on either or both of the measured pH value of the waste liquid or the measured ammonia concentration of the waste liquid measured by the sensor. Effect of the Invention

[0011] The system for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid of the present invention can efficiently neutralize waste liquid containing ammonia. [Brief description of the drawings]

[0012] [Figure 1] 1 is a block diagram showing a system for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a modified example of the system for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a block diagram showing a modified example of the system for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a block diagram showing a system for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to a second embodiment of the present invention. [Diagram 5] FIG. 13 is a diagram showing a system for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to a third embodiment of the present invention, and is a schematic diagram showing a waste liquid tank for storing waste liquid. [Figure 6] FIG. 13 is a diagram showing a system for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to a fourth embodiment of the present invention, and is a schematic diagram showing a waste liquid tank for storing waste liquid. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] [First embodiment] A system 100 for neutralizing an ammonia-containing waste liquid and a method for neutralizing an ammonia-containing waste liquid according to a first embodiment of the present invention will be described in detail with reference to FIG.

[0014] <Neutralization treatment system for ammonia-containing wastewater> The neutralization treatment system 100 for ammonia-containing waste liquid shown in FIG. 1 (hereinafter referred to as the "neutralization treatment system" as appropriate) is an apparatus for purifying and neutralizing waste fluid (hereinafter referred to as the "waste fluid WF") such as lubricating oil LO, fuel oil, bilge water, etc., that contains ammonia (hereinafter referred to as the "ammonia AM") used in an engine 200 such as a combustion engine installed on a ship or in a limited installation space on land (for example, a remote island power plant or an existing power plant, etc.).

[0015] Hereinafter, an example of the neutralization processing system 100 according to the present invention will be described using a case where the waste liquid WF is lubricating oil LO used in an engine 200 that burns liquid ammonia. The neutralization processing system 100 according to the present invention can be used for all ammonia waste liquid as long as the waste liquid WF contains ammonia AM, and below, an example of the neutralization processing system 100 equipped with a purifier 1 will be described. In an engine 200 that uses liquid ammonia as fuel, the lubricating oil LO inside the engine 200 may become contaminated with sludge SG and ammonia water AW.

[0016] The neutralization processing system 100 includes a purifier 1. The purifier 1 is a three-phase separation type separation plate type centrifuge that separates the raw liquid DO, which is lubricating oil LO mixed with ammonia water (hereinafter referred to as "ammonia water AW"), into a light liquid, which is the purified lubricating oil LO, a heavy liquid, which is ammonia water AW containing ammonia AM, and a sludge, which is a solid content (hereinafter referred to as "sludge SG"). The neutralization processing system 100 mainly includes a lubricating oil tank 300, a lubricating oil supply pump P1, the purifier 1, a waste liquid tank 500, a neutralization tank 600, a sludge tank 700, a heavy liquid discharge line 120, a neutralizing agent supply line 170, a waste liquid discharge line 180, a sensor 720 (pH meter 721, ammonia sensor 722, liquid level meter 730), a raw liquid supply line 130, and a sludge discharge line 160. The neutralization system 100 is located on board a ship.

[0017] ≪Organization≫ For example, the engine 200 shown in Fig. 1 is a marine diesel engine arranged inside a ship, which uses liquid ammonia as fuel, which has zero emissions of carbon dioxide, a greenhouse gas, and may be a turbine engine. The engine 200 is made up of a mechanism that connects a crankshaft and a piston only with a connecting rod. In the engine 200, side pressure, which is a lateral force, is generated in the piston, causing uneven wear in the cylinder. For this reason, the engine 200 uses a lubricating oil LO to improve the movement of the piston. The engine 200 may be one that burns a mixture of liquid ammonia and a fossil fuel such as natural gas.

[0018] <Lubricant oil discharge line> 1 is a piping for sending lubricant LO (undiluted DO) used in the engine 200 to a lubricant tank 300. One end of the lubricant discharge line 150 is connected to the engine 200, and the other end is connected to the lubricant tank 300.

[0019] <Lubricating oil tank and lubricating oil> 1, the lubricant oil tank 300 is a tank for storing the stock solution DO containing the lubricant oil LO used by the engine 200. The stock solution DO supplied from the engine 200 to the lubricant oil tank 300 contains ammonia AM derived from the ammonia fuel. For this reason, the lubricant oil tank 300 is made of a tank with a lid that prevents the vaporized ammonia AM from leaking out of the lubricant oil tank 300. Furthermore, the raw solution DO contains moisture that has been mixed in the engine 200 .

[0020] <Ammonia water and water> Ammonia water AW is an alkaline aqueous solution in which ammonia AM is dissolved in water. Ammonia water AW has a characteristic pungent odor. There is a risk that ammonia water AW will corrode the fluororubber O-rings and the heavy liquid / light liquid impellers made of copper alloy used in the purifier 1. For this reason, it is preferable that these parts are made of a corrosion-resistant material.

[0021] <Concentrated solution supply line> 1 is a piping for supplying the raw solution DO (lubricating oil LO mixed with sludge SG and ammonia water AW) stored in the lubricating oil tank 300 to the purifier 1. The raw solution supply line 130 is made up of a heater upstream side line 131 from the lubricating oil tank 300 to the heater 400, and a heater downstream side line 132 from the heater 400 to the purifier 1. A lubricating oil supply pump P1 is provided in the heater upstream side line 131, and a three-way valve 134 is provided in the heater downstream side line 132.

[0022] <Lubricating oil supply pump> The lubricant supply pump P1 is a pump for sending the raw solution DO in the lubricant tank 300 from the raw solution supply line 130 to the purifier 1 via the heater 400. As shown in FIG. 1, the raw solution DO in the heater upstream line 131 is mixed with ammonia water AW.

[0023] <Heater> The heater 400 is an oil heater that heats the lubricating oil LO to be sent to the purifier 1. The heater 400 heats the lubricating oil LO to reduce the viscosity, thereby increasing the efficiency of separation of solids and / or water in the purifier 1. As shown in Fig. 1, the raw solution DO in the heater downstream line 132 is mixed with ammonia water AW and sludge SG.

[0024] <Light liquid discharge line> The light liquid discharge line 140 is a flow path for returning the lubricant LO (light liquid) purified by the purifier 1 to the lubricant tank 300. The light liquid discharge line 140 is composed of a piping path from the discharge port of the purifier 1 to the lubricant supply port of the lubricant tank 300.

[0025] Purifier The purifier 1 is a device for separating / removing sludge SG (solids) and ammonia water AW contained in the raw solution DO supplied from the lubricating oil tank 300 from the lubricating oil LO. The purifier 1 may be, for example, a separation plate type centrifuge that separates the raw solution DO into three phases of liquid (light liquid)-liquid (heavy liquid)-solids by the centrifugal force of a rotor rotating at high speed.

[0026] <Sludge discharge line> The sludge discharge line 160 is a discharge path for discharging the sludge SG centrifuged by the purifier 1 to the outside of the purifier 1. The upstream side of the sludge discharge line 160 is connected to a sludge discharge port of the purifier 1, and the downstream side is connected to a sludge tank 700 via a waste liquid discharge line 180 (see FIG. 1). The sludge SG in the purifier 1 is released into the waste liquid discharge line 180 and stored in the sludge tank 700, and then discarded.

[0027] <Waste liquid discharge line> The waste liquid discharge line 180 is a waste liquid discharge means for supplying the waste liquid WF to the sludge tank 700 .

[0028] <Waste tank> 1 is a tank for storing waste liquid WF including sludge SG separated by the purifier 1. The waste liquid tank 500 is disposed downstream of the sludge discharge line 160. The waste liquid tank 500 may be one or more. The sludge SG is accumulated on the outermost diameter side inside the rotor 3 by the centrifugal force of the purifier 1, and is discharged from the sludge discharge port to the sludge discharge line 160. In the first embodiment, the ammonia water AW (heavy liquid) separated in the purifier 1 is also stored in the waste liquid tank 500. The waste liquid tank 500 may be provided with an input water supply line 712 and a vent line 770, similar to the sludge tank 700.

[0029] <Neutralization tank, neutralizing agent supply line and waste liquid> The neutralization tank 600 is a tank for storing a neutralizer (hereinafter referred to as "neutralizer N") that neutralizes the mixture of sludge SG and ammonia water AW (hereinafter referred to as "waste liquid WF") stored in the waste liquid tank 500. The neutralization tank 600 is provided with a neutralizer supply line 170 that supplies the neutralizer N in the neutralization tank 600 to the waste liquid tank 500. The neutralizing agent supply line 170 is a neutralizing agent supply means for supplying the neutralizing agent N to the waste liquid tank 500 .

[0030] <Neutralizing agent> The neutralizing agent N is for neutralizing the waste liquid WF containing the ammonia water AW in the waste liquid tank 500, and is composed of, for example, a material having an acidic component such as citric acid. The neutralizing agent N may be a solid (powder (including a crystalline state)) or a liquid, so long as it neutralizes the waste liquid WF containing the ammonia water AW. The neutralizing agent N is introduced into the waste liquid WF in the sludge tank 700 from the neutralizing agent supply line 170. The neutralizing agent N is supplied according to the measured pH value and the measured ammonia concentration value of the waste liquid WF detected by the sensor 720, and neutralizes the waste liquid WF. The neutralizing agent N is preferably citric acid. Citric acid is easy to handle and highly safe. The neutralizing agent N may be citric acid powder (crystals of anhydrous citric acid (C6H8O7) or citric acid hydrate (C6H8O7·H2O)) or an aqueous citric acid solution. When citric acid is used as the neutralizing agent N, iron oxide may be added to the waste liquid WF as a detoxifying agent. When citric acid and iron oxide are added to the ammonia water AW, ferric ammonium citrate is produced. The neutralizing agent N and the detoxifying agent consist of a solid or liquid.

[0031] <Sludge tank> The sludge tank 700 is a tank for storing the waste liquid WF discharged from the waste liquid tank 500. The sludge tank 700 is provided with the waste liquid discharge line 180. If the neutralized waste liquid WF in the sludge tank 700 is at 40° C. or higher, a cooling device for cooling the waste liquid WF may be installed. The sludge tank 700 storing the neutralized waste liquid WF in which the ammonia AM has been neutralized and rendered harmless can be easily carried out and moved from the installation site.

[0032] <Input water supply line> The input water supply line 712 is a flow path for supplying an appropriate amount of water to the sludge tank 700 or the waste liquid tank 500 in accordance with the components, concentration, etc. of the waste liquid WF in the sludge tank 700 or the waste liquid tank 500. The input water supply line 712 may be provided as necessary, and may be omitted.

[0033] <Vent line> The vent line 770 is a pipe for discharging gas or water vapor in the gas phase of the sludge tank 700 or the waste liquid tank 500. The vent line 770 serves to adjust the expansion and contraction of gas caused by changes in the pressure and temperature of the gas in the sludge tank 700, and to remove unnecessary gas. This vent line 770 may be provided with a valve, a pump, a filter, etc.

[0034] <Sensor> The sensor 720 shown in FIG. 1 or FIG. 4 is a detector including a pH meter 721 that measures the pH of the waste liquid WF in the sludge tank 700 or the waste liquid tank 500, an ammonia sensor 722 that measures the ammonia concentration of the waste liquid WF, and the like. The pH meter 721 measures the pH of the waste liquid WF in the sludge tank 700 or the waste liquid tank 500, and by adding an optimal amount of neutralizing agent N to the waste liquid WF based on the measured value, the waste liquid WF can be efficiently neutralized. The ammonia sensor 722 measures the ammonia concentration of the waste liquid WF in the sludge tank 700 or the waste liquid tank 500, and by adding an optimal amount of neutralizing agent N to the waste liquid WF based on the measured value, the waste liquid WF can be efficiently neutralized.

[0035] <Heavy liquid discharge line> The heavy liquid discharge line 120 is a flow path for discharging the ammonia water AW (separated water) centrifuged in the purifier 1. The ammonia water AW in the purifier 1 is stored in a sludge tank 700 and then discarded.

[0036] ≪Effect≫ Next, the operation of the system 100 for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment of the present invention will be described with reference to FIG.

[0037] As shown in FIG. 1, lubricating oil LO (undiluted oil DO) used in an engine 200 is stored in a lubricating oil tank 300 and then introduced into a purifier 1 through an undiluted oil supply line 130.

[0038] The ammonia water AW and sludge SG (waste liquid WF) separated in the purifier 1 shown in FIG. 1 are discharged from a sludge discharge line 160 to a waste liquid tank 500, and then sent from a waste liquid discharge line 180 to a sludge tank 700 where they are stored.

[0039] On ships, sludge SG must be landed and treated as industrial waste. However, if the ammonia concentration of the sludge SG is high, landing may be refused. For this reason, it is preferable to neutralize the waste liquid WF containing ammonia AM on board the ship.

[0040] In the waste liquid tank 500, as shown in FIG. 1, at least one of the pH and the ammonia concentration of the waste liquid WF stored in the waste liquid tank 500 is measured by a sensor 720 (a pH meter 721, an ammonia sensor 722) (measurement step). Then, the neutralizing agent N is added to the waste liquid WF to neutralize the waste liquid WF (neutralization step) according to at least one of the measured pH value of the waste liquid WF and the measured ammonia concentration value of the waste liquid WF measured by the sensor 720. In this manner, the waste liquid WF containing ammonia AM can be efficiently neutralized.

[0041] 1, the neutralization processing system 100 according to the first embodiment neutralizes waste liquid WF containing ammonia AM. The neutralization processing system 100 includes one or more waste liquid tanks 500, a sludge discharge line 160 that supplies waste liquid WF to the waste liquid tank 500, a neutralizing agent supply line 170 that supplies a neutralizing agent N to the waste liquid tank 500, and a sensor 720 (pH meter 721, ammonia sensor 722) that measures the pH of the waste liquid WF or the ammonia concentration of the waste liquid WF.

[0042] According to this configuration, the neutralizing agent N can be supplied to the waste liquid WF according to at least one of the measured pH value of the waste liquid WF detected by the sensor 720 and the measured ammonia concentration of the waste liquid WF, thereby enabling efficient neutralization.

[0043] The process of supplying the neutralizing agent N to the waste liquid WF in accordance with the measured value of the ammonia concentration of the waste liquid WF may be performed by automatically operating a pump or a valve using a control device, or may be performed manually.

[0044] In addition, the neutralizing agent N has an acidic component. If the neutralizing agent N is acidic, it can neutralize the waste liquid WF containing ammonia AM.

[0045] Also, the sensor 720 shown in FIG. 1 is either or both of a pH meter 721 and an ammonia sensor 722. In this configuration, the pH value and ammonia concentration can be directly measured, so that an appropriate amount of neutralizing agent N can be supplied to the waste liquid WF.

[0046] In addition, it is preferable that the neutralizing agent N contains citric acid. According to this configuration, citric acid is easy to handle and highly safe, and therefore it can be easily transported and stored.

[0047] As shown in FIG. 1, the waste liquid tank 500 is provided with an input water supply line 712 for supplying water to the waste liquid tank 500 . According to this configuration, the waste liquid tank 500 is provided with the input water supply line 712, and by supplying water from the input water supply line 712, the waste liquid WF in the waste liquid tank 500 can be appropriately cooled and diluted.

[0048] The neutralization processing system 100 includes one or more waste liquid tanks 500 for storing the waste liquid WF. According to this configuration, the neutralization processing system 100A includes one or a plurality of waste liquid tanks 500, and thus can store waste liquid WF generated on a ship or the like as needed according to the amount of the waste liquid WF.

[0049] 1, the method for neutralizing ammonia-containing waste liquid of this embodiment neutralizes waste liquid WF containing ammonia AM. Specifically, the pH or ammonia concentration of the waste liquid WF stored in the sludge tank 700 or the waste liquid tank 500 is measured by a sensor 720 (pH meter 721, ammonia sensor 722, etc.), and the neutralizing agent N is added to the waste liquid WF to neutralize the waste liquid WF according to either or both of the measured pH value of the waste liquid WF measured by the sensor 720 and the measured ammonia concentration of the waste liquid WF.

[0050] According to this method for neutralizing ammonia-containing waste liquid, the neutralizing agent N can be added to the waste liquid WF according to the measured pH value or the measured ammonia concentration value of the waste liquid WF measured by the sensor 720, thereby efficiently neutralizing the waste liquid WF.

[0051] [Modification of the first embodiment] The present invention is not limited to the first embodiment described above, and various modifications and changes are possible within the scope of the technical concept thereof. It goes without saying that the present invention also covers such modifications and changes.

[0052] In the following, the modified examples of the system 100 for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment will be described, focusing on the differences from the system 100 for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment. Note that the same reference numerals are used to designate the configurations that have already been described, and the description thereof will be omitted. 2 and 3 are block diagrams showing modified examples of the system 100 for neutralizing ammonia-containing waste liquid and the method for neutralizing ammonia-containing waste liquid according to the first embodiment of the present invention.

[0053] The neutralization treatment system 100 for ammonia-containing waste liquid shown in FIG. 1 may further include a detoxifying agent tank 780 for storing a detoxifying agent (additives for detoxification (hereinafter referred to as "detoxifying agent AD")) and a detoxifying agent supply line 711 for supplying the detoxifying agent AD stored in the detoxifying agent tank 780 to the sludge tank 700 or the waste liquid tank 500, like the neutralization treatment systems 100A and 100B for ammonia-containing waste liquid shown in FIGS. 2 and 3.

[0054] According to this configuration, the neutralization treatment systems 100A, 100B are equipped with a detoxifying agent tank 780 and a detoxifying agent supply line 711, and are therefore able to detoxify the waste liquid WF by supplying a detoxifying agent AD to the waste liquid WF in the sludge tank 700 or the waste liquid tank 500.

[0055] Thus, the ammonia-containing waste liquid neutralization treatment systems 100A, 100B include a sludge discharge line 160 for discharging sludge SG, one or more waste liquid tanks 500 provided at the end of the sludge discharge line 160, a sludge tank 700 for storing waste liquid WF from the waste liquid tank 500, a waste liquid discharge line 180 for supplying the waste liquid WF to the sludge tank 700, a neutralizing agent supply line 170 for supplying neutralizing agent N to the waste liquid tank 500, and a sensor 720 for measuring the pH of the waste liquid WF in the waste liquid tank 500 or the ammonia concentration of the waste liquid WF.

[0056] According to this configuration, the neutralization processing systems 100A, 100B are equipped with a sensor 720 that measures the pH of the waste liquid WF in the waste liquid tank 500 or the ammonia concentration of the waste liquid WF, so that the pH value and the ammonia concentration can be measured directly, and therefore an appropriate amount of neutralizing agent N can be supplied to the waste liquid tank 500.

[0057] 2, the neutralization treatment system 100A is provided with a detoxifying agent supply line 711 that supplies a detoxifying agent AD containing iron oxide to the sludge tank 700. When citric acid is used as the neutralizing agent N, it is preferable to supply iron oxide as the detoxifying agent to the waste liquid WF. In this configuration, when citric acid and iron oxide are added to the ammonia water AW, ferric ammonium citrate is generated, and the waste liquid WF can be rendered harmless.

[0058] 3, the neutralization treatment system 100B is provided with a detoxifying agent supply line 711 for supplying a detoxifying agent AD containing iron oxide to the waste liquid tank 500. In this case, the upstream side of the detoxifying agent supply line 711 is preferably connected to a detoxifying agent tank 780 for storing the detoxifying agent AD. According to this configuration, the neutralization processing system 100B is provided with the detoxifying agent supply line 711, and thus can supply the detoxifying agent AD to the waste liquid WF in the waste liquid tank 500 to detoxify the waste liquid WF.

[0059] [Second embodiment] FIG. 4 is a block diagram showing a system 100C for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to the second embodiment of the present invention.

[0060] The waste liquid tank 500 and the waste liquid discharge line 180 of the first embodiment shown in FIG. 1 may be omitted as in the neutralization processing system 100C shown in FIG. In this case, the downstream side of the sludge discharge line 160 to which the purifier 1 is connected is connected to the sludge tank 700. In addition, the downstream side of the neutralizing agent supply line 170 connected to the neutralization tank 600 is connected to the sludge tank 700. Note that the number of sludge discharge lines 160 and purifiers 1 is not limited to one, and there may be multiple sludge discharge lines 160 and purifiers 1. The sludge tank 700 is provided with sensors 720 (pH meter 721, ammonia sensor 722, etc.) in the same manner as the waste liquid tank 500 shown in FIG. Even in this case, the neutralization system 100C exhibits the same effects as the neutralization system 100 of the first embodiment.

[0061] 4, the sludge tank 700 of the neutralization treatment system 100C may be provided with an input water supply line 712 for supplying water to the sludge tank 700. In this case, it is preferable to provide a vent line 770 in the sludge tank 700. According to this configuration, the sludge tank 700 is provided with the input water supply line 712, so that the waste liquid WF in the sludge tank 700 can be diluted. In addition, the sludge tank 700 of the neutralization treatment system 100C may be equipped with a detoxifying agent supply line 711 for supplying a detoxifying agent AD, a liquid level gauge 730 for monitoring the amount (liquid level) of waste liquid WF stored in the sludge tank 700, and a device or structure 740 with an agitation function described below.

[0062] [Third embodiment] FIG. 5 is a diagram showing a system 100D for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to a third embodiment of the present invention, and is a schematic diagram showing a sludge tank 700 for storing the waste liquid WF.

[0063] As shown in FIG. 5, the waste liquid tank 500 may be provided with a waste liquid discharge line 180, a waste liquid transfer pump 761, a device or structure 740 with an agitation function, a neutralizing agent supply line 170, a sludge discharge line 160, a detoxifying agent supply line 711, an input water supply line 712, a vent line 770, a liquid level measuring device 730, and a sensor 720 (e.g., a pH measuring device 721, an ammonia sensor 722, etc.). Unlike FIG. 1, a plurality of purifiers 1 are provided.

[0064] The waste liquid discharge line 180 is a flow path for transferring the waste liquid WF in the waste liquid tank 500 to the sludge tank 700. A waste liquid transfer pump 761 is provided in the waste liquid discharge line 180. The waste liquid transfer pump 761 is a pump for transferring the waste liquid WF in the waste liquid tank 500 to the sludge tank 700. In this embodiment, the amount of waste liquid WF stored in the waste liquid tank 500 is measured by a liquid level gauge 730, and the flow rate of the waste liquid discharge line 180 (the discharge amount of the waste liquid transfer pump 761) is controlled according to the amount of waste liquid WF stored.

[0065] Note that a plurality of sludge tanks 700, waste liquid discharge lines 180, and waste liquid transfer pumps 761 may be provided depending on the amount of waste liquid WF generated in the ship. Also, for example, the liquid level gauge 730 can transfer the waste liquid WF to an arbitrary tank depending on the liquid level in the tank. Alternatively, for example, the waste liquid WF that has overflowed from the waste liquid tank 500 may be configured to be guided to the sludge tank 700. In this case, the waste liquid transfer pump 761 may be omitted.

[0066] The neutralization system 100D may include one or more sludge tanks 700 for storing neutralized waste fluid WF (Waste fluid). According to this configuration, the neutralization treatment system 100D is provided with one or a plurality of sludge tanks 700, and thus can store waste liquid WF generated on board a ship or the like as appropriate according to the amount of the waste liquid WF.

[0067] A device or structure 740 having a stirring function for stirring the waste liquid WF may be provided in the waste liquid tank 500. The device or structure 740 having a stirring function may be any device or structure having a function for stirring the waste liquid WF in the waste liquid tank 500, and may be composed of, for example, a stirrer. The device or structure 740 having a stirring function may be provided as appropriate according to the situation of the waste liquid WF in the waste liquid tank 500, the neutralizing agent N, the detoxifying agent AD to be added to the waste liquid WF, and the like, and may be omitted. According to this configuration, by providing a device or structure 740 with a stirring function in the waste liquid tank 500, the waste liquid WF in the waste liquid tank 500 can be efficiently mixed with the neutralizing agent N or the detoxifying agent AD, making the waste liquid WF harmless.

[0068] Similarly, the sludge tank 700 may be provided with a device or structure 740 having a stirring function for stirring the waste liquid WF. According to this configuration, by providing a device or structure 740 with a stirring function within the sludge tank 700, the waste liquid WF in the sludge tank 700 can be efficiently mixed with the neutralizing agent N or the detoxifying agent AD, making the waste liquid WF harmless.

[0069] As in the first embodiment, the neutralizing agent supply line 170 is a conveying path for supplying the neutralizing agent N into the waste liquid tank 500. In the neutralizing agent supply line 170, the neutralizing agent N is sent into the waste liquid tank 500 in an amount corresponding to the measured pH value of the waste liquid WF measured by a sensor 720 (e.g., a pH meter 721, an ammonia sensor 722, etc.).

[0070] As in the first embodiment, the sludge discharge line 160 is a flow path for discharging the waste liquid WF discharged from the purifier 1 into the waste liquid tank 500. The number of sludge discharge lines 160 and purifiers 1 is not limited to one, and may be multiple. By providing an appropriate number of sludge discharge lines 160 and purifiers 1, the neutralization treatment system 100D can suitably treat a large amount of waste liquid WF.

[0071] The detoxifying agent supply line 711 is a transport path for supplying the detoxifying agent AD, which detoxifies the waste liquid WF in the waste liquid tank 500, to the waste liquid tank 500. An appropriate detoxifying agent can be selected according to the components of the waste liquid WF. When the neutralizing agent N is citric acid, the detoxifying agent is preferably iron oxide. In the detoxifying agent supply line 711, an amount of the detoxifying agent AD according to the measured values ​​of the pH and ammonia concentration of the waste liquid WF measured by the sensor 720 is sent into the waste liquid tank 500. The neutralization processing system 100D can detoxify the waste liquid WF in the waste liquid tank 500 by providing the detoxifying agent supply line 711 and adding the detoxifying agent AD. The detoxifying agent supply line 711 may be provided appropriately depending on the components of the waste liquid WF in the waste liquid tank 500, and may be omitted.

[0072] The input water supply line 712 is a flow path for supplying an appropriate amount of water W according to the components, concentration, etc. of the waste liquid WF in the waste liquid tank 500. The neutralization treatment system 100D is provided with the input water supply line 712 and can dilute the waste liquid WF in the waste liquid tank 500 by inputting water. The input water supply line 712 may be provided appropriately depending on the components and conditions of the waste liquid WF in the waste liquid tank 500, and may be omitted.

[0073] The vent line 770 is a pipe for discharging gas and water vapor in the gas phase of the waste liquid tank 500. The vent line 770 serves to adjust the expansion and contraction of gas caused by changes in the pressure and temperature of the gas in the waste liquid tank 500, and to remove unnecessary gas. The vent line 770 may be provided with a valve, a pump, a filter, and the like.

[0074] The liquid level gauge 730 is a gauge for measuring the amount (liquid level) of the waste liquid WF stored in the waste liquid tank 500. By providing the liquid level gauge 730, the waste liquid transfer pump 761 can be driven according to the amount of waste liquid stored in the waste liquid tank 500, and the waste liquid WF can be transferred to the sludge tank 700. The liquid level measuring device 730 may be provided as needed, or may be omitted. In addition, the neutralization processing system 100D may be provided with a weir instead of the liquid level gauge 730 so that when the waste liquid WF in the waste liquid tank 500 reaches a predetermined liquid level, it flows (overflows) from the waste liquid discharge line 180 into the sludge tank 700. The sensor 720 is composed of a pH meter 721, similar to the first embodiment.

[0075] In this way, the ammonia-containing waste liquid neutralization treatment system 100D is provided with a liquid level gauge 730 in the waste liquid tank 500, and the neutralized waste liquid WF is transferred to the sludge tank 700 at any time depending on the liquid level of the neutralized waste liquid WF in the waste liquid tank 500.

[0076] According to this configuration, the neutralization processing system 100D can transfer the neutralized waste liquid WF to the sludge tank 700 according to the liquid level of the waste liquid WF in the waste liquid tank 500. Therefore, if the amount of the waste liquid WF stored in the waste liquid tank 500 increases, the waste liquid WF can be automatically sent to the sludge tank 700 as appropriate, and a large amount of the waste liquid WF can be efficiently stored.

[0077] [Fourth embodiment] FIG. 6 is a diagram showing a system 100E for neutralizing ammonia-containing waste liquid and a method for neutralizing ammonia-containing waste liquid according to the fourth embodiment, and is a schematic diagram showing a sludge tank 700 for storing the waste liquid WF.

[0078] In the third embodiment, the neutralization treatment system 100D (see FIG. 5) for the ammonia-containing waste liquid has been described as having one waste liquid tank 500. However, as in the neutralization treatment system 100E shown in FIG. 6, a plurality of waste liquid tanks 500A, 500B may be provided. The neutralization processing system 100E includes a plurality of waste liquid tanks 500A, 500B and one sludge tank 700. Furthermore, since the amount of waste liquid WF that can be stored can be increased, it can be used for large ships and large facilities. In addition, since neutralization processing can be performed at multiple locations, even if one of the waste liquid tanks 500A, 500B cannot be used due to maintenance, a malfunction, or the like, processing of the waste liquid WF can be continued.

[0079] It is preferable that each of the two waste liquid tanks 500A, 500B is provided with a waste liquid discharge line 180, a waste liquid transfer pump 761A, 761B, a device or structure 740 with an agitation function, a neutralizing agent supply line 170, a sludge discharge line 160, a detoxifying agent supply line 711, an input water supply line 712, a vent line 770, a liquid level measuring device 730, and a sensor 720 (e.g., a pH measuring device 721, an ammonia sensor 722, etc.).

[0080] The waste liquid WF accumulated in each of the waste liquid tanks 500A, 500B may be transferred from the waste liquid discharge line 180 to the sludge tank 700 by driving the waste liquid transfer pumps 761A, 761B according to the liquid levels in each of the waste liquid tanks 500A, 500B.

[0081] [Variation 1] In the first embodiment, the purifier 1 is a three-phase separation plate-type centrifuge, but a two-phase separation plate-type centrifuge may be used. When a two-phase separation plate-type centrifuge is used as the purifier 1, it is preferable to provide a pressure sensor 840 for detecting the pressure of the ammonia water AW discharged from the heavy liquid discharge section 15 of the purifier 1, and to supply water into the separation chamber of the purifier 1 when the measurement value of the pressure sensor 840 falls below a predetermined value.

[0082] [Variation 2] In the first to fourth embodiments and the first modification, the neutralization processing systems 100, 100A, 100B, 100C, 100D, and 100E are exemplified as including the purifier 1, but they do not have to include the purifier 1. Even in this case, the same effects as those of the neutralization processing systems 100 to 100E of the first to fourth embodiments and the first modification can be achieved. [Explanation of symbols]

[0083] 1 Purifier 100,100A,100B,100C,100D,100E Ammonia-containing wastewater neutralization treatment system 160 Sludge discharge line 170 Neutralizer supply line 180 Waste liquid discharge line 500 Waste tank 600 Neutralization Tank 700, 700A, 700B Sludge Tank 701 Treated waste liquid tank 711 Detoxifying Agent Supply Line 712 Input water supply line 720 Sensors 721 pH Meter 722 Ammonia Sensor 730 Liquid level measuring device 740 Devices or structures with stirring function AM Ammonia AW Ammonia water N Neutralizer SG Sludge WF Waste liquid

Claims

1. A system for neutralizing ammonia-containing waste liquid, which separates waste liquid containing at least sludge and ammonia from lubricating oil used in a marine diesel engine, and neutralizes the waste liquid, comprising: a purifier for purifying the lubricating oil; one or more sludge tanks; a sludge discharge line for supplying the waste liquid separated from the lubricating oil by the purifier to the sludge tank; a neutralizing agent supply line for supplying a neutralizing agent to the sludge tank; A sensor for measuring the pH of the waste liquid or the ammonia concentration of the waste liquid. Ammonia-containing wastewater neutralization treatment system.

2. A system for neutralizing ammonia-containing waste liquid, which separates waste liquid containing at least sludge and ammonia from lubricating oil used in a marine diesel engine and neutralizes the waste liquid, a purifier for purifying the lubricating oil; one or more waste tanks; a sludge discharge line for supplying the waste liquid separated from the lubricating oil by the purifier to the waste liquid tank; a sludge tank for storing the waste liquid from the waste liquid tank; a waste liquid discharge line that supplies the waste liquid in the waste liquid tank to the sludge tank; a neutralizing agent supply line for supplying a neutralizing agent to the waste liquid tank; a sensor for measuring a pH of the waste liquid in the waste liquid tank or an ammonia concentration of the waste liquid; Ammonia-containing wastewater neutralization treatment system.

3. A system for neutralizing an ammonia-containing waste liquid, which separates sludge and ammonia water from lubricating oil after use in a marine diesel engine, and neutralizes a waste liquid containing at least the sludge and the ammonia water, a purifier for purifying the lubricating oil; one or more waste tanks; a sludge discharge line for supplying the sludge separated from the lubricating oil by the purifier to the waste liquid tank; a heavy liquid discharge line that supplies the ammonia water separated from the lubricating oil by the purifier to the waste liquid tank; a neutralizing agent supply line for supplying a neutralizing agent to the waste liquid tank; a sensor for measuring a pH of the waste liquid in the waste liquid tank or an ammonia concentration of the waste liquid; A sludge tank that stores the waste liquid discharged from the waste liquid tank. Ammonia-containing wastewater neutralization treatment system.

4. A system for neutralizing an ammonia-containing waste liquid, which separates sludge and ammonia water from lubricating oil after use in a marine diesel engine, and neutralizes a waste liquid containing at least the sludge and the ammonia water, a purifier for purifying the lubricating oil; one or more sludge tanks; a sludge discharge line for supplying the sludge separated from the lubricating oil by the purifier to the sludge tank; a heavy liquid discharge line for supplying the ammonia water separated from the lubricating oil by the purifier to the sludge tank; a neutralizing agent supply line for supplying a neutralizing agent to the sludge tank; A sensor for measuring the pH of the wastewater in the sludge tank or the ammonia concentration of the wastewater. Ammonia-containing wastewater neutralization treatment system.

5. The neutralizing agent has an acidic component. The system for neutralizing an ammonia-containing waste liquid according to any one of claims 1 to 4.

6. The sensor is either a pH meter or an ammonia sensor, or both. The system for neutralizing an ammonia-containing waste liquid according to any one of claims 1 to 4.

7. The neutralizing agent includes citric acid. The system for neutralizing an ammonia-containing waste liquid according to any one of claims 1 to 4.

8. A detoxifying agent supply line is provided to supply iron oxide to the sludge tank. The system for neutralizing an ammonia-containing waste liquid according to claim 7.

9. The neutralizing agent contains citric acid, and a detoxifying agent supply line is provided for supplying iron oxide to the waste liquid tank. The system for neutralizing an ammonia-containing waste liquid according to claim 2.

10. A device having a stirring function for stirring the waste liquid is provided in the sludge tank. The system for neutralizing an ammonia-containing waste liquid according to claim 1.

11. A device having a stirring function for stirring the waste liquid is provided in the waste liquid tank. The system for neutralizing an ammonia-containing waste liquid according to claim 2.

12. The sludge tank is provided with a water supply line for supplying water to the sludge tank. The system for neutralizing an ammonia-containing waste liquid according to claim 1.

13. The waste liquid tank is provided with a water supply line for supplying water to the waste liquid tank. The system for neutralizing an ammonia-containing waste liquid according to claim 2.

14. A liquid level gauge is provided in the waste liquid tank, a liquid level gauge for measuring the amount of neutralized waste liquid stored in the waste liquid tank; a waste liquid transfer pump for transferring the waste liquid in the waste liquid tank to the sludge tank, The discharge amount of the waste liquid transfer pump is controlled according to the amount of the liquid stored measured by the liquid level gauge. The system for neutralizing an ammonia-containing waste liquid according to claim 2.

15. A method for neutralizing an ammonia-containing waste liquid, comprising: separating a waste liquid containing at least sludge and ammonia from lubricating oil after use in a marine diesel engine; and neutralizing the waste liquid, comprising the steps of: The lubricating oil is purified by a purifier; supplying the waste liquid separated from the lubricating oil by the purifier to one or more waste liquid tanks via a sludge discharge line; Measure the pH or ammonia concentration of the waste liquid in the waste liquid tank with a sensor; neutralizing the waste liquid by adding a neutralizing agent to the waste liquid in accordance with either or both of the measured pH value of the waste liquid measured by the sensor and the measured ammonia concentration of the waste liquid; A method for neutralizing ammonia-containing waste liquid.

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