Neutralization treatment system for ammonia-containing waste liquid and neutralization treatment method for ammonia-containing waste liquid

Abstract

The invention relates to an ammonia-containing waste liquid neutralization treatment system and an ammonia-containing waste liquid neutralization treatment method. Ammonia mixed in the lubricating oil can be neutralized to a safe level after separation, so that sludge can be unloaded and incinerated on a ship. A neutralization treatment system (100) for an ammonia-containing waste liquid is a device for neutralizing an ammonia-containing waste liquid (WF) containing ammonia (AM). A neutralization treatment system (100) for an ammonia-containing waste liquid is provided with: one or more neutralization sludge tanks (500); a sludge discharge line (160) for supplying ammonia-containing waste liquid (WF) to the neutralization sludge tank (500); a neutralizing agent supply line (180) that supplies a neutralizing agent (N) to the neutralizing sludge tank (500); a sludge circulation line (170) for circulating the ammonia-containing waste liquid (WF) stored in the neutralization sludge tank (500); and a sludge transfer pump (171) that is provided in the sludge circulation line (170) and moves the ammonia-containing waste liquid (WF).

Description

Technical Field

[0001] This invention relates to a neutralization treatment system and method for ammonia-containing wastewater. Background Technology

[0002] When ammonia fuel, considered a carbon-neutral fuel, is used in generators, ammonia engines, etc., in ships, ammonia may mix into the lubricating oil. When it mixes into the lubricating oil, ammonia also mixes with the sludge and separated water discharged from the lubricating oil purifier. If the odor concentration inside the ship exceeds 25 ppm, the sludge and separated water cannot be incinerated or unloaded onto land.

[0003] In order to reduce the impact of ammonia gas or ammonia water generated on ships like this on human health and the environment, for example, the ammonia water storage system and ammonia fuel ship described in Patent Document 1 are known.

[0004] The ammonia storage system described in Patent Document 1 includes: an ammonia storage tank for storing ammonia gas or ammonia water; a water supply pipeline for supplying seawater to the ammonia storage tank; and a drainage pipeline for discharging the ammonia water from the ammonia storage tank to the outside of the ship.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2023-93265

[0008] The ammonia storage system and ammonia fuel ship described in Patent Document 1 discharge the ammonia gas or ammonia water generated on board through a drainage pipeline after neutralizing the ammonia gas or ammonia water generated on board by an ammonia neutralization device.

[0009] In recent years, the ideal approach has been to neutralize ammonia-containing lubricating oils used in machinery installed on ships and other vessels to a safe level on board, and then incinerate them on board, or to unload the sludge accompanying the lubricating oil purification process onto land for disposal. Summary of the Invention

[0010] The present invention addresses the aforementioned problem by providing a system and method for neutralizing ammonia mixed in lubricating oil to a safe level after separation, thereby enabling the unloading of sludge from ships and the neutralization of ammonia-containing wastewater incinerated on ships.

[0011] Solution for solving the problem

[0012] To address the aforementioned problem, the present invention provides a neutralization treatment system for ammonia-containing wastewater, comprising: one or more neutralization sludge tanks; a sludge discharge pipeline for supplying the ammonia-containing wastewater to the neutralization sludge tanks; a neutralizing agent supply pipeline for supplying a neutralizing agent to the neutralization sludge tanks; a sludge circulation pipeline for discharging the ammonia-containing wastewater stored in the neutralization sludge tanks through the neutralization sludge tanks and returning it to the neutralization sludge tanks; and a sludge transfer pump, disposed in the sludge circulation pipeline, for moving the ammonia-containing wastewater.

[0013] Furthermore, the present invention is a neutralization treatment method for ammonia-containing wastewater containing ammonia, wherein a neutralizing agent is supplied from a neutralizing agent supply line to a neutralization sludge tank storing the ammonia-containing wastewater to neutralize the ammonia-containing wastewater, and the neutralized ammonia-containing wastewater in the neutralization sludge tank is circulated in the sludge circulation pipeline by a sludge transfer pump provided in the sludge circulation pipeline and supplied to the neutralization sludge tank, thereby agitating it.

[0014] Invention Effects

[0015] The neutralization treatment system and method for ammonia-containing waste liquid of the present invention can neutralize ammonia mixed in lubricating oil to a safe level after separation, thereby enabling the unloading of sludge onto land and its incineration on board. Attached Figure Description

[0016] Figure 1 This is a block diagram illustrating the structure of the ammonia-containing waste liquid neutralization treatment system and the ammonia-containing waste liquid neutralization treatment method according to the first embodiment of the present invention.

[0017] Figure 2 This is a block diagram showing the main parts of the neutralization treatment system and method for ammonia-containing waste liquid according to the second embodiment of the present invention, and the control device is omitted.

[0018] Figure 3 This is a block diagram showing the main parts of the neutralization treatment system and method for ammonia-containing waste liquid according to the third embodiment of the present invention, and the control device is omitted.

[0019] Figure 4 This is a block diagram showing the main parts of the neutralization treatment system and method for ammonia-containing waste liquid according to the fourth embodiment of the present invention, and the control device is omitted.

[0020] Figure 5 This is a block diagram showing the main parts of the neutralization treatment system and method for ammonia-containing waste liquid according to the fifth embodiment of the present invention, and the control device is omitted.

[0021] Figure 6 This is a block diagram showing the main parts of the neutralization treatment system and method for ammonia-containing waste liquid according to the sixth embodiment of the present invention, and the control device is omitted.

[0022] Figure 7 This is a block diagram illustrating the neutralization treatment method for ammonia-containing wastewater according to the seventh embodiment of the present invention.

[0023] Figure 8 This is a block diagram illustrating the neutralization treatment method for ammonia-containing wastewater according to the eighth embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1: Purifier; 100, 100A, 100B, 100C, 100D, 100E: Neutralization treatment system for ammonia-containing wastewater (neutralization treatment system); 160: Sludge discharge pipeline; 170: Sludge circulation pipeline; 171: Sludge transfer pump; 172: Switching valve; 173A: Static mixer; 180: Neutralizing agent supply pipeline; 181: Neutralizing agent transfer pump; 200: Machine; 500: Neutralization sludge tank; 520: Sensor; 600: Main sludge tank; 601: Main sludge tank transfer pipeline; 700: Neutralizing agent tank; 900: Control device; AM: Ammonia; AW: Ammonia water; DO: Concentrate; LO: Lubricating oil; N: Neutralizing agent; SG: Sludge; WF: Ammonia-containing wastewater (waste liquid). Detailed Implementation

[0026] [First Implementation]

[0027] Reference Figure 1 The neutralization treatment system 100 for ammonia-containing wastewater according to the first embodiment of the present invention and the neutralization treatment method for ammonia-containing wastewater will be described in detail below. Furthermore, in the following description, components with the same structure will be labeled with the same reference numerals and their descriptions will be omitted.

[0028] <Neutralization Treatment System for Ammonia-Containing Waste>

[0029] Figure 1 The ammonia-containing wastewater neutralization system (hereinafter, appropriately referred to as the "neutralization system") 100 shown is a device for purifying and neutralizing waste fluids (hereinafter, appropriately referred to as "waste fluid WF") such as lubricating oil LO, fuel oil, and bilge water containing ammonia (hereinafter referred to as "ammonia AM") and sludge SG. The neutralization system 100 is used to neutralize waste fluid WF containing ammonia AM that has been used in machines such as gas turbines 200 installed in limited installation spaces (e.g., isolated island power plants, existing power plants, etc.) on ships or land.

[0030] Hereinafter, as an example of the neutralization treatment system 100 of the present invention, we will describe the case where lubricating oil LO used in the machine 200 that burns liquid ammonia is treated as waste liquid WF. The neutralization treatment system 100 of the present invention can be used for all ammonia waste liquids, as long as the waste liquid WF contains ammonia AM. Hereinafter, as an example, we will describe the neutralization treatment system 100 equipped with a purifier 1.

[0031] In machine 200, which uses liquid ammonia as fuel, sludge SG and ammonia water AW may mix into the lubricating oil LO inside machine 200.

[0032] The neutralization treatment system 100 includes a purifier 1. The purifier 1 is a three-phase separation type centrifuge that separates lubricating oil LO (original liquid DO) mixed with ammonia water (hereinafter referred to as "ammonia water AW") into a light liquid as purified lubricating oil LO, a heavy liquid as ammonia water AW containing ammonia AM, and sludge (hereinafter referred to as "sludge SG") as a solid component.

[0033] The neutralization treatment system 100 mainly includes a lubricating oil tank 300, a lubricating oil supply pump P1, a purifier 1, a neutralization sludge tank 500, a main sludge tank 600, a neutralizing agent tank 700, a heavy liquid discharge pipeline 120, a raw liquid supply pipeline 130, a light liquid discharge pipeline 140, a sludge discharge pipeline 160, a sludge circulation pipeline 170, a neutralizing agent supply pipeline 180, and a cleaning water discharge pipeline 190.

[0034] <Machine>

[0035] For example, Figure 1 The illustrated machine 200 is a marine diesel engine installed on a ship. It uses liquid ammonia, which emits zero carbon dioxide (a greenhouse gas), as fuel, and therefore can also be a turbine. Machine 200 consists of a mechanism that connects the crankshaft and piston solely via a connecting rod. In machine 200, lateral forces (side pressure) are generated on the piston, and uneven wear occurs on the cylinder. Therefore, machine 200 uses lubricating oil LO to ensure proper piston movement. Machine 200 can also co-fire fossil fuels such as liquid ammonia and natural gas.

[0036] <Lubricating oil discharge line>

[0037] Figure 1 The lubricating oil discharge line 150 shown is a piping path for delivering lubricating oil LO (current DO) used in machine 200 to lubricating oil tank 300. One end of the lubricating oil discharge line 150 is connected to machine 200, and the other end is connected to lubricating oil tank 300.

[0038] <Lubricating oil tank and lubricating oil>

[0039] like Figure 1 As shown, lubricating oil tank 300 is a tank for storing raw liquid DO containing lubricating oil LO used in machine 200. The raw liquid DO supplied from machine 200 to lubricating oil tank 300 contains ammonia AM derived from ammonia fuel. Therefore, lubricating oil tank 300 is a covered tank that prevents the vaporized ammonia AM from leaking outside the lubricating oil tank 300.

[0040] In addition, the original DO solution contains water that has been mixed in with the machine 200.

[0041] <Ammonia and Water>

[0042] Ammonia solution (AW) is an alkaline aqueous solution of ammonia (AM) dissolved in water. Ammonia solution (AW) has a characteristic pungent odor. Ammonia solution (AW) may corrode components used in the purifier, such as fluororubber O-rings and copper alloy heavy / light liquid impellers. Therefore, these parts are preferably made of corrosion-resistant materials.

[0043] <Potent Solution Supply Line>

[0044] Figure 1 The crude oil supply line 130 shown is a piping path for supplying crude oil DO (lubricating oil LO mixed with sludge SG and ammonia water AW) stored in the lubricating oil tank 300 to the purifier 1. The crude oil supply line 130 consists of an upstream line 131 from the lubricating oil tank 300 to the heater 400 and a downstream line 132 from the heater 400 to the purifier 1. A lubricating oil supply pump P1 is provided on the upstream line 131, and a three-way valve 134 is provided on the downstream line 132.

[0045] Lubricating oil supply pump

[0046] The lubricating oil supply pump P1 is used to deliver the raw lubricating oil (DO) from the lubricating oil tank 300 to the purifier 1 via the heater 400 and the raw lubricating oil supply line 130. For example... Figure 1 As shown, the raw liquid DO in the upstream pipeline 131 of the heater contains ammonia water AW.

[0047] <Heater>

[0048] Heater 400 is an oil heater that heats the lubricating oil LO supplied to purifier 1. Heater 400 heats the lubricating oil LO, reducing its viscosity, thereby improving the separation efficiency of solid components and / or moisture in purifier 1. Figure 1 As shown, the raw liquid DO in the downstream pipeline 132 of the heater contains ammonia water AW and sludge SG.

[0049] <Light Liquid Discharge Line>

[0050] The light liquid discharge line 140 is a flow path used to return the lubricating oil LO (light liquid) purified by the purifier 1 to the lubricating oil tank 300. The light liquid discharge line 140 consists of a piping path from the discharge port of the purifier 1 to the lubricating oil supply port of the lubricating oil tank 300.

[0051] Air purifier

[0052] Purifier 1 is a device used to separate / remove sludge SG (solid components) and ammonia water AW from the raw lubricating oil LO, which contains lubricating oil LO used in a machine 200 fueled by ammonia AM. Purifier 1 can be, for example, a plate centrifuge that separates the raw lubricating oil DO into three phases—liquid (light liquid), liquid (heavy liquid), and solid components—by the centrifugal force of a high-speed rotating body, or it can be modified accordingly.

[0053] <Sludge Discharge Pipeline>

[0054] The sludge discharge line 160 is a discharge path for discharging the waste liquid WF containing sludge SG, separated by centrifugation in the purifier 1, to the neutralization sludge tank 500. The upstream side of the sludge discharge line 160 is connected to the sludge outlet of the purifier 1, and the downstream side is connected to the main sludge tank 600 via the neutralization sludge tank 500 and the sludge circulation line 170. After being discharged into the sludge discharge line 160 and stored in the neutralization sludge tank 500, the waste liquid WF containing sludge SG in the purifier 1 is then stored in the main sludge tank 600 via the sludge circulation line 170. Furthermore, the waste liquid WF containing sludge SG stored in the neutralization sludge tank 500 is neutralized by neutralizing agent N supplied from the neutralizing agent tank 700 via the neutralizing agent supply line 180.

[0055] <Cleaning water drain line>

[0056] Sometimes, to remove residual ammonia AG in purifier 1, cleaning water is supplied to dissolve the ammonia AG in the cleaning water, thereby cleaning purifier 1. The cleaning water discharge line 190 is the discharge path for discharging the cleaning water injected into the frame of purifier 1. Therefore, the cleaning water containing ammonia AG drawn into the frame of purifier 1 is discharged into the neutralization sludge tank 500.

[0057] <Sludge Tank>

[0058] Figure 1The neutralization sludge tank 500 shown is used to store and neutralize the waste liquid WF containing sludge SG separated by the purifier 1. It should be noted that the sludge SG accumulates on the outermost diameter side of the rotating body due to the centrifugal force of the purifier 1, and is discharged from the sludge discharge outlet through the sludge discharge pipeline 160 into the neutralization sludge tank 500. The neutralization sludge tank 500 also stores ammonia water AW (heavy liquid) and washing water separated by the purifier 1. The neutralization sludge tank 500 is equipped with a sludge tank vapor outlet 510, a sensor 520, a level switch 530, a sludge circulation pipeline 170, and a neutralizing agent supply pipeline 180.

[0059] It should be noted that there may be multiple neutralization sludge tanks 500. Furthermore, if the sensor 520 is installed in the sludge circulation pipeline 170 (described later), it may not need to be installed in the neutralization sludge tank 500.

[0060] The sludge tank steam outlet 510 is an outlet for discharging gases, vapors, etc. generated in the neutralization sludge tank 500.

[0061] Sensor 520 is a measuring device used to measure the hydrogen ion index, ammonia concentration, etc., of waste liquid WF containing sludge SG stored in neutralization sludge tank 500. Sensor 520 can be, for example, a pH meter or an ammonia sensor. The following explanation uses a pH meter as an example of sensor 520. Sensor 520 measures the pH of the waste liquid WF in neutralization sludge tank 500 and adds the optimal amount of neutralizing agent N to the waste liquid WF based on the measured value, thereby efficiently neutralizing the waste liquid WF.

[0062] <Horizontal Switch>

[0063] The level switch 530 is a sensor that monitors the amount of waste liquid WF containing sludge SG stored in the neutralization sludge tank 500. The level switch 530 only needs to detect the amount of waste liquid WF containing sludge SG stored in the neutralization sludge tank 500, but it can also be modified to use other sensors. For example, the level switch 530 can be configured to have a high level switch (LSH) and a low level switch (LSL).

[0064] The high-level switch LSH operates when the waste liquid WF containing sludge SG in the neutralization sludge tank 500 reaches a preset high level. When the level of sludge SG in the neutralization sludge tank 500 reaches the specified height, the high-level switch LSH issues an alarm or stops the inflow from the sludge discharge line 160, the neutralizing agent supply line 180, etc. Therefore, the high-level switch LSH prevents overflow from the neutralization sludge tank 500.

[0065] The low-level switch LSL operates when the waste liquid WF containing sludge SG in the neutralization sludge tank 500 reaches a preset low level. When the level of sludge SG in the neutralization sludge tank 500 reaches the designated low position, the low-level switch LSL begins supplying the waste liquid from the purifier 1, the sludge circulation line 170, or the neutralizing agent supply line 180. Therefore, the low-level switch LSL prevents the neutralization sludge tank 500 from becoming empty.

[0066] <Sludge Circulation Pipeline>

[0067] The sludge circulation pipeline 170 is a flow path that circulates waste liquid WF containing sludge SG through and back to the neutralization sludge tank 500 to efficiently neutralize the waste liquid WF containing sludge SG stored in the neutralization sludge tank 500. The sludge circulation pipeline 170 is equipped with a sludge transfer pump 171 and a switching valve 172, and is connected to the main sludge tank transfer pipeline 601. It should be noted that a sensor 520 can also be installed in the sludge circulation pipeline 170.

[0068] <Sludge Transfer Pump>

[0069] The sludge transfer pump 171 is a pump used to transfer or agitate waste liquid WF containing sludge SG within the sludge circulation pipeline 170. The sludge transfer pump 171 is positioned in the sludge circulation pipeline 170 between the neutralization sludge tank 500 and the switching valve 172. The sludge transfer pump 171 is electrically connected to the control device 900 and is driven by electrical signals from the control device 900.

[0070] <Switching valve>

[0071] Switching valve 172 is a three-way valve used to switch the direction of movement of ammonia-containing waste liquid WF flowing in the sludge circulation pipeline 170 between the neutralization sludge tank 500 side and the main sludge tank transfer pipeline 601 side. Switching valve 172 is located in the sludge circulation pipeline 170, downstream of the sludge transfer pump 171, between the sludge transfer pump 171 and the neutralization sludge tank 500. Switching valve 172 is electrically connected to control device 900 and is opened and closed by electrical signals from control device 900.

[0072] <Main sludge tank transfer pipeline>

[0073] The main sludge tank transfer line 601 is a flow path used to supply ammonia-containing waste liquid WF circulating in the sludge circulation line 170 from the neutralization sludge tank 500 to the main sludge tank 600. One side of the main sludge tank transfer line 601 is connected to the switching valve 172, and the other side is connected to the main sludge tank 600.

[0074] <Main Sludge Tank>

[0075] Figure 1 The main sludge tank 600 shown is a tank for storing neutral waste liquid (hereinafter referred to as "neutral waste liquid NLW") that has been neutralized in the neutralization sludge tank 500 by neutralizers (hereinafter referred to as "neutralizer N") from the neutralizer tank 700.

[0076] <Neutralizing Agent Tank>

[0077] Neutralizing agent tank 700 is a tank used to store neutralizing agent N, which is used to neutralize ammonia-containing waste liquid WF and render it harmless. Neutralizing agent tank 700 is equipped with a neutralizing agent supply line 180.

[0078] Neutralizing agent

[0079] Neutralizing agent N is used to neutralize ammonia-containing waste liquid WF in the neutralization sludge tank 500. For example, it is composed of a substance containing acidic components such as citric acid. Neutralizing agent N only needs to neutralize the ammonia-containing waste liquid WF and can be a solid (powder, including crystalline states) or a liquid. Neutralizing agent N is added to the ammonia-containing waste liquid WF in the neutralization sludge tank 500 through neutralizing agent supply line 180. Neutralizing agent N is supplied based on the measured pH value and ammonia concentration value of the ammonia-containing waste liquid WF detected by sensor 520, thereby neutralizing the ammonia-containing waste liquid WF. Neutralizing agent N is preferably citric acid. Citric acid is easy to handle and has high safety. It should be noted that neutralizing agent N can be citric acid powder (anhydrous citric acid (C6H8O7) or citric acid hydrate (C6H8O7·H2O) crystals) or an aqueous solution of citric acid.

[0080] When using citric acid as neutralizing agent N, ferric oxide can be added to waste liquid WF as a harmless agent. When citric acid and ferric oxide are added to ammonia water AW, ferric ammonium citrate is formed. Neutralizing agent N and the harmless agent can be either solid or liquid.

[0081] <Neutralizing agent supply pipeline>

[0082] The neutralizing agent supply line 180 is a flow path for supplying neutralizing agent N from the neutralizing agent tank 700 to the neutralizing sludge tank 500. The neutralizing agent supply line 180 is equipped with a neutralizing agent transfer pump 181 and a check valve 182.

[0083] Neutralizing agent transfer pump 181 is a pump used to draw neutralizing agent N from neutralizing agent tank 700 and deliver it from neutralizing agent supply line 180 to neutralizing sludge tank 500.

[0084] Check valve 182 is a valve that restricts the flow direction of neutralizing agent N flowing in neutralizing agent supply line 180 to flow from neutralizing agent tank 700 to neutralizing sludge tank 500. In other words, check valve 182 is a valve that prevents flow from neutralizing sludge tank 500 to neutralizing agent tank 700.

[0085] <Control Device>

[0086] The control device 900 is an electrical connection to and controls the purifier 1, sensor 520, level switch 530, sludge transfer pump 171, switching valve 172, and neutralizer transfer pump 181. When the pH or ammonia concentration detected by sensor 520 is below a threshold, the control device 900 performs the following control: it activates the sludge transfer pump 171 and switching valve 172 to supply ammonia-containing waste liquid WF from the sludge circulation line 170 to the main sludge tank 600.

[0087] In addition, when the pH or ammonia concentration detected by the sensor 520 is greater than or equal to the threshold, the control device 900 performs the following control: it activates the neutralizing agent transfer pump 181 to supply neutralizing agent N from the neutralizing agent supply line 180 to the neutralizing sludge tank 500 to neutralize the ammonia-containing waste liquid WF.

[0088] Furthermore, if the control device 900 determines that the neutralization of the ammonia-containing waste liquid WF is incomplete based on the pH or ammonia concentration detected by the sensor 520, it performs the following control: it activates the sludge transfer pump 171 to supply the ammonia-containing waste liquid WF from the sludge circulation line 170 to the neutralization sludge tank 500 and circulates and stirs it.

[0089] Furthermore, if the control device 900 determines that the neutralization of the ammonia-containing waste liquid WF is incomplete based on the pH or ammonia concentration detected by the sensor 520, it performs the following control: it activates the sludge transfer pump 171 to supply the ammonia-containing waste liquid WF from the sludge circulation line 170 to the neutralization sludge tank 500 and circulates and stirs it, and it performs the following control: it activates the neutralizing agent transfer pump 181 to supply neutralizing agent N from the neutralizing agent supply line 180 to the neutralization sludge tank 500 to neutralize the ammonia-containing waste liquid WF.

[0090] In addition, the control device 900 drives the purifier 1, the sludge transfer pump 171, and the neutralizing agent transfer pump 181.

[0091] <Function>

[0092] Next, refer to Figure 1 The function of the neutralization treatment system 100 for ammonia-containing waste liquid WF and the neutralization treatment method for ammonia-containing waste liquid WF according to the first embodiment of the present invention will be explained.

[0093] like Figure 1As shown, the lubricating oil LO (original DO) used in machine 200 is stored in lubricating oil tank 300 and then introduced into purifier 1 from original DO supply line 130.

[0094] pass Figure 1 The ammonia water AW and sludge SG (waste liquid WF) separated by the purifier 1 shown are discharged from the sludge discharge pipeline 160 into the neutralization sludge tank 500.

[0095] On ships, sludge (SG) needs to be unloaded and disposed of as industrial waste. However, in cases where the ammonia concentration in the sludge (SG) is high, unloading is sometimes refused. Therefore, wastewater (WF) containing ammonia (AM) is preferably neutralized onboard.

[0096] It should be noted that if gas or vapor is generated inside the neutralization sludge tank 500, it will be discharged from the sludge tank vapor outlet 510.

[0097] The amount of sludge SG stored in the neutralization sludge tank 500 is detected during neutralization by a horizontal switch 530.

[0098] In the sludge neutralization tank 500, such as Figure 1 As shown, at least one of the pH and ammonia concentration of the waste liquid WF stored in the neutralization sludge tank 500 is measured by sensor 520 (measurement process).

[0099] Then, based on at least one of the measured values ​​of pH and ammonia concentration of waste liquid WF as measured by sensor 520, neutralizing agent N is added to waste liquid WF in neutralization sludge tank 500 to neutralize waste liquid WF (neutralization process).

[0100] The neutralized waste liquid WF from the neutralization sludge tank 500 is circulated in the sludge circulation pipeline 170 via the sludge transfer pump 171, and is agitated by being supplied to the neutralization sludge tank 500 (agitation process). By doing so, waste liquid WF containing ammonia AM can be neutralized efficiently.

[0101] Furthermore, if the control device 900 determines that neutralization is incomplete based on the pH or ammonia concentration of the waste liquid WF in the neutralization sludge tank 500 as measured by the sensor 520, it continues to circulate and stir. During the circulation and stirring, the control device 900 drives the neutralizing agent transfer pump 181 to continue feeding the neutralizing agent N into the neutralization sludge tank 500.

[0102] When the control device 900 determines that the waste liquid WF has reached a level of complete neutralization based on the pH or ammonia concentration of the waste liquid WF measured by the sensor 520, it supplies the waste liquid WF from the sludge circulation pipeline 170 to the main sludge tank 600 for storage.

[0103] Except in cases of malfunction in purifier 1 or the system, or in emergency situations such as the neutralizer tank 700 being in a state where the liquid level rises to an emergency level, all waste liquid WF delivered to the main sludge tank 600 can be neutralized.

[0104] In this way, the wastewater WF is circulated and neutralized to a pre-set pH value or ammonia concentration, and stored as neutral wastewater NLW in the main sludge tank 600. Therefore, when the neutralization treatment system 100 is used for bilge sewage treatment, the ammonia-containing wastewater WF accumulated at the bilge can be neutralized to a safe level, and thus can be discharged overboard after treatment by the bilge separator.

[0105] like Figure 1 As shown, the neutralization treatment system 100 of the first embodiment is a neutralization treatment system for ammonia-containing waste liquid WF containing ammonia AM, comprising: one or more neutralization sludge tanks 500; a sludge discharge pipeline 160 for supplying ammonia-containing waste liquid WF to the neutralization sludge tanks 500; a neutralizing agent supply pipeline 180 for supplying neutralizing agent N to the neutralization sludge tanks 500; a sludge circulation pipeline 170 for discharging and returning the ammonia-containing waste liquid WF stored in the neutralization sludge tanks 500; and a sludge transfer pump 171 provided in the sludge circulation pipeline 170 for moving the ammonia-containing waste liquid WF.

[0106] According to this configuration, the neutralization treatment system 100 can neutralize the ammonia-containing waste liquid WF by supplying neutralizing agent N to the neutralization sludge tank 500 via a neutralizing agent supply line 180. Furthermore, the neutralized ammonia-containing waste liquid WF in the neutralization sludge tank 500 can be circulated in the sludge circulation line 170 by the power of the sludge transfer pump 171, and agitated by supplying it to the neutralization sludge tank 500. Therefore, the ammonia-containing waste liquid WF containing ammonia AM and the like mixed in with the lubricating oil LO can be neutralized to a safe level after separation, thus enabling the unloading of sludge SG from the ship and its incineration on board using a boiler.

[0107] Furthermore, when the neutralization treatment system 100 is used for bilge sewage treatment, the ammonia-containing waste liquid WF accumulated at the bilge can be neutralized to a safe level, and therefore can be discharged outside the ship after treatment by the bilge sewage separator.

[0108] In addition, the neutralization treatment system 100 includes a purifier 1, which separates the original liquid DO containing lubricating oil LO used in the machine 200 fueled by ammonia AM into lubricating oil LO and sludge SG and ammonia water AW as ammonia-containing waste liquid WF.

[0109] In this configuration, by having a purifier 1, the original liquid DO can be separated into lubricating oil LO, sludge SG, and ammonia water AW, thereby removing them. Therefore, sludge SG and ammonia AM can be easily disposed of.

[0110] In addition, such as Figure 1 As shown, the neutralization treatment system 100 is configured to include: a main sludge tank 600 for storing neutral waste liquid NLW after neutralization of ammonia-containing waste liquid WF; and a main sludge tank transfer pipeline 601, which branches off from the sludge circulation pipeline 170 and is used to supply neutral waste liquid NLW to the main sludge tank 600. The sludge circulation pipeline 170 is also provided with a switching valve 172 for switching the movement direction of the ammonia-containing waste liquid WF in the sludge circulation pipeline 170 and the main sludge tank transfer pipeline 601.

[0111] According to this configuration, the neutralization treatment system 100, through the sludge circulation pipeline 170, enables the ammonia-containing waste liquid WF, which has been neutralized by the neutralization sludge tank 500, to be circulated and returned, thereby neutralizing multiple times.

[0112] In addition, the neutralization treatment system 100, through a switching valve 172, enables the ammonia-containing waste liquid WF containing neutralizing agent N flowing in the sludge circulation pipeline 170 to flow to the main sludge tank 600 for storage.

[0113] In addition, such as Figure 1 As shown, in the neutralization sludge tank 500, a sensor 520 for measuring the pH or ammonia concentration of the ammonia-containing waste liquid WF is installed in either or both of the neutralization sludge tank 500 and the sludge circulation pipeline 170. A control device 900 is installed to control the sludge transfer pump 171 and the switching valve 172 based on the signal from the sensor 520. When the pH or ammonia concentration detected by the sensor 520 is lower than the threshold, the control device 900 performs the following control: switches the switching valve 172 to supply neutralization ammonia-containing waste liquid WF to the main sludge tank 600, and makes the sludge transfer pump 171 work.

[0114] In this configuration, if the pH and ammonia concentration of the ammonia-containing waste liquid WF in the neutralization sludge tank 500 are detected by sensor 520 and neutralized to an appropriate concentration, it is then sent to the main sludge tank 600 for storage.

[0115] In addition, such as Figure 1As shown, the neutralization sludge tank 500 is equipped with a sensor 520 for measuring the pH or ammonia concentration of the ammonia-containing waste liquid WF. The sensor 520 for measuring the pH or ammonia concentration of the ammonia-containing waste liquid WF is located in either or both of the neutralization sludge tank 500 and the sludge circulation pipeline 170. The sensor 520 and the sludge transfer pump 171 are connected to the control device 900. The neutralizing agent supply pipeline 180 is equipped with a neutralizing agent transfer pump 181 for supplying neutralizing agent N stored in the neutralizing agent tank 700 to the neutralization sludge tank 500. When the pH or ammonia concentration detected by the sensor 520 is greater than or equal to a threshold, the control device 900 performs the following control: it activates the neutralizing agent transfer pump 181 to supply neutralizing agent N from the neutralizing agent supply pipeline 180 to the neutralization sludge tank 500 to neutralize the ammonia-containing waste liquid WF.

[0116] In this configuration, when the pH or ammonia concentration of the ammonia-containing waste liquid WF in the neutralization sludge tank 500 is high, the concentration can be detected by the sensor 520, and the neutralizing agent transfer pump 181 can be activated. Therefore, the neutralizing agent transfer pump 181 can supply neutralizing agent N to the neutralization sludge tank 500 according to the concentration of the ammonia-containing waste liquid WF, thereby neutralizing it to the desired concentration.

[0117] In addition, such as Figure 1 As shown, in the neutralization sludge tank 500, a sensor 520 for measuring the pH or ammonia concentration of the ammonia-containing waste liquid WF is installed in either or both of the neutralization sludge tank 500 and the sludge circulation pipeline 170. The sensor 520 and the sludge transfer pump 171 are connected to the control device 900. If the control device 900 determines that the neutralization of the ammonia-containing waste liquid WF is incomplete based on the pH or ammonia concentration detected by the sensor 520, it performs the following control: it activates the sludge transfer pump 171 to supply the ammonia-containing waste liquid WF from the sludge circulation pipeline 170 to the neutralization sludge tank 500 and circulates and stirs it.

[0118] In this configuration, by including sensor 520, it is possible to detect and confirm whether the neutralization of ammonia-containing waste liquid WF in the neutralization sludge tank 500 is incomplete. If the neutralization is incomplete, control device 900 can supply ammonia-containing waste liquid WF from sludge circulation line 170 to the neutralization sludge tank 500 and circulate and agitate it, thereby promoting neutralization.

[0119] In addition, such as Figure 1As shown, the neutralizing agent supply line 180 is equipped with a neutralizing agent transfer pump 181 for supplying neutralizing agent N stored in the neutralizing agent tank 700 to the neutralizing sludge tank 500. When the control device 900 determines that the neutralization of the ammonia-containing waste liquid WF is incomplete based on the pH or ammonia concentration detected by the sensor 520, it performs the following control: it operates the sludge transfer pump 171 to supply the ammonia-containing waste liquid WF from the sludge circulation line 170 to the neutralizing sludge tank 500 and circulates and stirs it, and performs the following control: it operates the neutralizing agent transfer pump 181 to supply neutralizing agent N from the neutralizing agent supply line 180 to the neutralizing sludge tank 500 to neutralize the ammonia-containing waste liquid WF.

[0120] In this configuration, when the ammonia-containing waste liquid WF is circulating in the sludge circulation pipeline 170, the control device 900 can operate the neutralizing agent transfer pump 181 to automatically supply neutralizing agent N to the neutralization sludge tank 500 and stir it efficiently.

[0121] In addition, such as Figure 1 As shown, the control device 900 drives the purifier 1, the sludge transfer pump 171, and the neutralizing agent transfer pump 181.

[0122] In this configuration, the control device 900 enables the purifier 1 to be driven in a linked manner with the sludge transfer pump 171 and the neutralizing agent transfer pump 181. Therefore, the present invention can efficiently neutralize the ammonia-containing wastewater (WF) discharged from the purifier 1, eliminating its environmental impact.

[0123] like Figure 1 As shown, in the neutralization treatment method for ammonia-containing wastewater WF containing ammonia AM, neutralizing agent N is supplied from neutralizing agent supply line 180 to neutralization sludge tank 500 storing ammonia-containing wastewater WF to neutralize the ammonia-containing wastewater WF. The neutralized ammonia-containing wastewater WF is circulated in the neutralization sludge tank 500 by sludge transfer pump 171 provided in sludge circulation line 170, and is stirred by supplying it to the neutralization sludge tank 500.

[0124] In this configuration, neutralizing agent N can be supplied from the neutralizing agent supply line 180 to the neutralizing sludge tank 500 to neutralize the ammonia-containing waste liquid WF. Furthermore, the ammonia-containing waste liquid WF within the neutralizing sludge tank 500 can be circulated in the sludge circulation line 170 by the power of the sludge transfer pump 171, and agitated by supplying it to the neutralizing sludge tank 500. Therefore, the ammonia-containing waste liquid WF, including ammonia AM, mixed with lubricating oil LO, can be neutralized to a safe level after separation, thus enabling the unloading of sludge SG onto land and its incineration on board.

[0125] In addition, such as Figure 1As shown, the neutralization treatment method for ammonia-containing waste liquid WF involves supplying the neutralized ammonia-containing waste liquid WF from the sludge circulation pipeline 170 to the main sludge tank 600 for storage via the sludge tank 500.

[0126] In this configuration, the ammonia-containing waste liquid WF, which has been neutralized by the neutralization sludge tank 500, is supplied from the sludge circulation pipeline 170 to the main sludge tank 600 for storage, thus enabling the neutralization of a large amount of ammonia-containing waste liquid WF.

[0127] [Second Implementation]

[0128] It should be noted that the present invention is not limited to the first embodiment. Various modifications and changes can be made within the scope of its technical concept, and the present invention naturally covers the invention after these modifications and changes.

[0129] Figure 2 This is a block diagram showing the main parts of the neutralization treatment system 100A for ammonia-containing waste liquid WF and the neutralization treatment method for ammonia-containing waste liquid WF according to the second embodiment of the present invention, and the control device is omitted.

[0130] like Figure 2 As shown, a static mixer 173A (also known as an "in-line mixer") for mixing ammonia-containing waste liquid WF and neutralizing agent N can also be installed in the sludge circulation line 170. In this case, the static mixer 173A is installed in the sludge circulation line 170 between the neutralizing sludge tank 500 and the sludge transfer pump 171.

[0131] The static mixer 173A can perform mixing without any power, thus enabling efficient mixing of ammonia-containing waste liquid WF and neutralizing agent N through this configuration.

[0132] [Third Implementation]

[0133] Figure 3 This is a block diagram showing the main parts of the neutralization treatment system 100B for ammonia-containing waste liquid WF and the neutralization treatment method for ammonia-containing waste liquid WF according to the third embodiment of the present invention, and the control device is omitted.

[0134] Figure 2 The static mixer 173A of the second embodiment shown can also be as follows: Figure 3 As shown in the static mixer 173B, it is located between the switching valve 172 of the sludge circulation line 170 and the neutralization sludge tank 500.

[0135] Even in this way, the neutralization processing system 100B performs the same function as the neutralization processing system 100 in the second embodiment.

[0136] [Fourth Implementation]

[0137] Figure 4 This is a block diagram showing the main parts of the neutralization treatment system 100C for ammonia-containing waste liquid WF and the neutralization treatment method for ammonia-containing waste liquid WF according to the fourth embodiment of the present invention, and the control device is omitted.

[0138] Figure 2 The static mixer 173A of the second embodiment shown can also be as follows: Figure 4 As shown in the static mixer 173C, it is located between the sludge transfer pump 171 and the switching valve 172 in the sludge circulation pipeline 170.

[0139] Even in this way, the neutralization processing system 100C performs the same function as the neutralization processing system 100 of the second embodiment.

[0140] [Fifth Implementation]

[0141] Figure 5 This is a block diagram showing the main parts of the neutralization treatment system 100D for ammonia-containing waste liquid WF according to the fifth embodiment of the present invention, and the control device is omitted.

[0142] Figure 3 The neutralizer supply line 180 of the third embodiment shown can also be as follows: Figure 5 As shown in the neutralizer supply line 180D, it is connected between the switching valve 172 and the static mixer 173B of the sludge circulation line 170.

[0143] Even in this way, the neutralization processing system 100D performs the same function as the neutralization processing system 100 of the second embodiment.

[0144] [Sixth Implementation Method]

[0145] Figure 6 This is a block diagram showing the main parts of the neutralization treatment system 100E for ammonia-containing waste liquid WF and the neutralization treatment method for ammonia-containing waste liquid WF according to the sixth embodiment of the present invention, and the control device is omitted.

[0146] Figure 3 The neutralization processing system 100B of the third embodiment shown can also be as follows: Figure 6 As shown in the neutralization treatment system 100E, a second neutralizing agent supply line 180E branching off from the neutralizing agent supply line 180 is connected to the sludge circulation line 170.

[0147] In this case, the second neutralizing agent supply line 180E, for example, branches off from between the check valve 182 and the neutralizing sludge tank 500, and is connected downstream between the static mixer 173B and the switching valve 172.

[0148] In this configuration, by providing a second neutralizing agent supply line 180E, the neutralizing agent N in the neutralizing agent supply line 180 can also be supplied to the sludge circulation line 170 to efficiently neutralize the ammonia-containing waste liquid WF.

[0149] [Seventh Implementation]

[0150] Figure 7 This is a block diagram illustrating the neutralization treatment method for ammonia-containing wastewater (WF) according to the seventh embodiment of the present invention. (See reference...) Figure 1 and Figure 7 The neutralization treatment method for ammonia-containing waste liquid WF according to the seventh embodiment of the present invention will be described.

[0151] On board, the lubricating oil LO used in machine 200 is a stock solution containing ammonia water AW and sludge SG (refer to...). Figure 1 The raw DO solution is centrifuged and separated into sludge SG, ammonia water AW, and lubricating oil LO by purifier 1 (sludge separation process 11).

[0152] like Figure 7 As shown, the sludge SG separated by the purifier 1 is discharged from the purifier 1 (sludge discharge step 12). The sludge SG is then reduced in volume and stored in a storage container such as a drum or can with the opening blocked (sludge storage step 13).

[0153] Next, the sludge SG contained in storage containers such as drums or cans is incinerated in the ship's incinerator to become incinerator ash (sludge incineration process 14). Then, the sludge SG, now incinerator ash, is removed from the incinerator (incinerator ash removal process 15). The incinerator ash removed from the incinerator is stored in the ship's engine room with its openings sealed in storage containers such as drums or cans (incinerator ash storage process 16).

[0154] Then, the sludge SG, which becomes incineration ash and is stored in drums or other containers, is unloaded from the ship as industrial waste when it docks at port and transported by truck to a disposal site for treatment. Similarly, waste liquid WF containing ammonia AM generated on board is incinerated on board, becomes incineration ash, and is stored in drums or other containers before being unloaded from the ship and disposed of.

[0155] [Eighth Implementation]

[0156] Figure 8 This is a block diagram illustrating the neutralization treatment method for ammonia-containing waste liquid WF according to the eighth embodiment of the present invention.

[0157] Next, refer to Figure 8 The neutralization treatment method for ammonia-containing waste liquid WF according to the eighth embodiment of the present invention will be described.

[0158] On board, the system oil used in engine 200 and accumulated in the crankcase becomes the stock solution DO containing ammonia water AW and sludge SG (see reference). Figure 1 The raw DO solution is removed from machine 200 (system oil removal process 11B).

[0159] As shown in Figure 9, the system oil taken from machine 200 is moved to a sampling tank for storage (sampling tank storage step 12B). The volatile gases retained in the sampling tank become highly concentrated and are discharged to the outside from the pipe air vent located at the top of the sampling tank.

[0160] Then, the remaining raw DO solution in the sampling tank is drawn by a transfer pump and sent to purifier 1 (transfer pump transfer step 13B). In the purification step 14B of purifier 1, the raw DO solution sent to purifier 1 is centrifuged and separated into sludge SG, ammonia water AW, and lubricating oil LO, and then returned to the sampling tank, or transferred to the sludge tank as waste liquid WF composed of sludge SG and ammonia water AW.

[0161] Waste liquid WF sent to the sludge tank undergoes heating and evaporation treatment inside the sludge tank (heating and evaporation treatment step 15B). Therefore, vapor and gas are generated inside the waste oil tank. The vapor and gas inside the waste oil tank are then discharged outside the waste oil tank.

[0162] Waste liquid WF remaining in the sludge tank is drawn into the waste oil tank by the sludge pump (system oil transfer step 16B). The waste liquid WF transferred to the waste oil tank is heated and evaporated (heating and evaporation treatment step 17B). As a result, vapor and gas are generated in the waste oil tank. The vapor and gas in the waste oil tank are discharged outside the waste oil tank.

[0163] Waste liquid (WF) remaining in the waste oil tank is sent to an incinerator for incineration (sludge incineration process 18B). The incineration smoke generated by incineration is discharged from the incinerator to the outside. In this way, system oil containing ammonia (AM) generated on board is disposed of by heating and evaporation treatment and sludge incineration on board.

[0164] [Variation Example]

[0165] In the first to sixth embodiments (see...) Figures 1-6In the description, the case where the purifier 1 of the neutralization treatment systems 100, 100A, 100B, 100C, 100D, and 100E is a single unit is provided, but multiple purifiers 1 can also be provided. In this case, multiple neutralization sludge tanks 500 and main sludge tanks 600 for storing neutral waste liquid NLW, which are supplied with waste liquid WF from purifier 1, can also be provided.

Claims

1. A neutralization treatment system for ammonia-containing wastewater, comprising: One or more sludge neutralization tanks; The sludge discharge pipeline supplies the ammonia-containing waste liquid to the neutralization sludge tank; A neutralizing agent supply line supplies neutralizing agent to the neutralization sludge tank; A sludge circulation pipeline is used to discharge the ammonia-containing waste liquid stored in the neutralization sludge tank through the neutralization sludge tank and return it to the neutralization sludge tank; and A sludge transfer pump is installed in the sludge circulation pipeline to move the ammonia-containing waste liquid.

2. The neutralization treatment system for ammonia-containing wastewater according to claim 1, comprising: A purifier that separates raw lubricating oil used in ammonia-fueled machines into lubricating oil and sludge and ammonia water as the ammonia-containing waste liquid.

3. The neutralization treatment system for ammonia-containing wastewater according to claim 1 or 2, wherein, The neutralization treatment system for the ammonia-containing waste liquid comprises: a main sludge tank for storing neutralized waste liquid after neutralization of the ammonia-containing waste liquid; and a main sludge tank transfer pipeline branching from the sludge circulation pipeline for supplying the neutralized waste liquid to the main sludge tank. The sludge circulation pipeline is also equipped with the main sludge tank transfer pipeline and a switching valve for switching the movement direction of the ammonia-containing waste liquid in the sludge circulation pipeline.

4. The neutralization treatment system for ammonia-containing wastewater according to claim 3, wherein, A sensor for measuring the pH or ammonia concentration of the ammonia-containing waste liquid is installed at either or both of the neutralization sludge tank and the sludge circulation pipeline. The ammonia-containing waste liquid neutralization treatment system is equipped with a control device that controls the sludge transfer pump and the switching valve based on signals from the sensor. When the pH or ammonia concentration detected by the sensor is lower than the threshold, the control device performs the following control: switches the switching valve to supply neutralized ammonia-containing waste liquid to the main sludge tank, and activates the sludge transfer pump.

5. The neutralization treatment system for ammonia-containing wastewater according to claim 1, wherein, A sensor for measuring the pH or ammonia concentration of the ammonia-containing waste liquid is installed at either or both of the neutralization sludge tank and the sludge circulation pipeline. The sensor, the sludge transfer pump, and the control device are connected. The neutralizing agent supply line is equipped with a neutralizing agent transfer pump for supplying the neutralizing agent stored in the neutralizing agent tank to the neutralizing sludge tank. When the pH or ammonia concentration detected by the sensor is greater than or equal to a threshold, the control device performs the following control: it activates the neutralizing agent transfer pump to supply the neutralizing agent from the neutralizing agent supply line to the neutralizing sludge tank to neutralize the ammonia-containing waste liquid.

6. The neutralization treatment system for ammonia-containing wastewater according to claim 2, wherein, A sensor for measuring the pH or ammonia concentration of the ammonia-containing waste liquid is installed at either or both of the neutralization sludge tank and the sludge circulation pipeline. The sensor, the sludge transfer pump, and the control device are connected. If the control device determines that the neutralization of the ammonia-containing waste liquid is incomplete based on the pH or ammonia concentration detected by the sensor, it performs the following control: it activates the sludge transfer pump to supply the ammonia-containing waste liquid from the sludge circulation pipeline to the neutralization sludge tank and circulates and stirs it.

7. The neutralization treatment system for ammonia-containing wastewater according to claim 6, wherein, The neutralizing agent supply line is equipped with a neutralizing agent transfer pump for supplying the neutralizing agent stored in the neutralizing agent tank to the neutralizing sludge tank. If the control device determines that the neutralization of the ammonia-containing waste liquid is incomplete based on the pH or ammonia concentration detected by the sensor, it performs the following control: activating the sludge transfer pump to supply the ammonia-containing waste liquid from the sludge circulation pipeline to the neutralization sludge tank and circulate and stir it, and activating the neutralizing agent transfer pump to supply the neutralizing agent from the neutralizing agent supply pipeline to the neutralization sludge tank to neutralize the ammonia-containing waste liquid.

8. The neutralization treatment system for ammonia-containing wastewater according to claim 7, wherein, The control device drives the purifier, the sludge transfer pump, and the neutralizing agent transfer pump.

9. The neutralization treatment system for ammonia-containing wastewater according to claim 1, wherein, The sludge circulation pipeline is equipped with a static mixer or pipeline mixer to mix the ammonia-containing waste liquid and the neutralizing agent.

10. The neutralization treatment system for ammonia-containing wastewater according to claim 1, wherein, In the neutralizing agent supply pipeline, a second neutralizing agent supply pipeline branching off from the neutralizing agent supply pipeline is connected to the sludge circulation pipeline.

11. A method for neutralizing ammonia-containing wastewater, comprising neutralizing ammonia-containing wastewater, wherein, Neutralizing agent is supplied from the neutralizing agent supply line to the neutralization sludge tank containing the ammonia-containing waste liquid to neutralize the waste liquid. The ammonia-containing waste liquid in the neutralization sludge tank is circulated in the sludge circulation pipeline by a sludge transfer pump located in the sludge circulation pipeline, and is agitated by supplying it to the neutralization sludge tank.

12. The neutralization treatment method for ammonia-containing wastewater according to claim 11, wherein, The ammonia-containing waste liquid, after being neutralized by the neutralization sludge tank, is supplied from the sludge circulation pipeline to the main sludge tank for storage.

13. The neutralization treatment method for ammonia-containing wastewater according to claim 11 or 12, wherein, The ammonia-containing waste liquid and the neutralizing agent circulating in the sludge circulation pipeline are mixed by a static mixer.

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