Ammonia-containing wastewater neutralization system and ammonia-containing wastewater neutralization method

Abstract

To enable the separation and neutralization of ammonia mixed in the lubricating oil to a safe level, thereby allowing the sludge to be unloaded and incinerated on board the ship. [Solution] The ammonia-containing wastewater neutralization treatment system 100 is a device for neutralizing ammonia-containing wastewater WF containing ammonia AM. The ammonia-containing wastewater neutralization treatment system 100 comprises one or more neutralization sludge tanks 500, a sludge discharge line 160 for supplying ammonia-containing wastewater WF to the neutralization sludge tanks 500, a neutralizing agent supply line 180 for supplying a neutralizing agent N to the neutralization sludge tanks 500, a sludge circulation line 170 for circulating the ammonia-containing wastewater WF stored in the neutralization sludge tanks 500, and a sludge transfer pump 171 provided in the sludge circulation line 170 for moving the ammonia-containing wastewater WF.

Description

Technical Field

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

Background Art

[0002] Ammonia fuel, regarded as a carbon-neutral fuel, may mix into lubricating oil when used in generators, ammonia combustion engines, etc. on ships. When it mixes into the lubricating oil, ammonia mixes into the sludge and separated water discharged from the lubricating oil cleaner. If the odor concentration, which is a shipboard regulation, exceeds 25 ppm, the sludge and separated water cannot be incinerated or landed.

[0003] As a means to reduce ammonia gas or ammonia water generated on board to the human body and the environment, for example, an ammonia water storage system and an ammonia fuel ship described in Patent Document 1 are known.

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

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The ammonia water storage system and ammonia-fueled ship described in Patent Document 1 neutralize the ammonia gas or ammonia water generated on board using an ammonia neutralization device before discharging it overboard through a drainage line.

[0007] In recent years, it has become desirable to neutralize ammonia-containing lubricating oil used in engines on ships and other vessels to a safe level on board, and then incinerate it on board, or to dispose of the sludge produced by cleaning the lubricating oil on land.

[0008] The present invention aims to solve the aforementioned problems and provide a neutralization system and method for ammonia-containing wastewater that enable the separation and neutralization of ammonia mixed in lubricating oil to a safe level, thereby allowing the sludge to be unloaded and incinerated on board a ship. [Means for solving the problem]

[0009] To solve the aforementioned problems, the present invention provides a neutralization treatment system for ammonia-containing wastewater containing ammonia, comprising: one or more neutralization sludge tanks; a sludge discharge line for supplying the ammonia-containing wastewater to the neutralization sludge tanks; a neutralizing agent supply line for supplying a neutralizing agent to the neutralization sludge tanks; a sludge circulation line for discharging the ammonia-containing wastewater stored in the neutralization sludge tanks from the neutralization sludge tanks and returning it to the neutralization sludge tanks; and a sludge transfer pump provided in the sludge circulation line for moving the ammonia-containing wastewater.

[0010] Furthermore, the present invention relates to a method for neutralizing ammonia-containing wastewater, wherein a neutralizing agent is supplied from a neutralizing agent supply line to a neutralization sludge tank in which the ammonia-containing wastewater is stored, thereby neutralizing the ammonia-containing wastewater, and the neutralized ammonia-containing wastewater in the neutralization sludge tank is circulated through a sludge circulation line by a sludge transfer pump provided in the sludge circulation line and supplied to the neutralization sludge tank, thereby agitating it. [Effects of the Invention]

[0011] The ammonia-containing wastewater neutralization system and method of the present invention enable the separation of ammonia mixed in lubricating oil and subsequent neutralization to a safe level, thereby allowing the sludge to be unloaded and incinerated on board a ship. [Brief explanation of the drawing]

[0012] [Figure 1] This is a block diagram showing the configuration of a neutralization system and a neutralization method for ammonia-containing wastewater according to the first embodiment of the present invention. [Figure 2] This is a block diagram showing the main parts of a neutralization system and a neutralization method for ammonia-containing wastewater according to a second embodiment of the present invention, with the control device omitted. [Figure 3] This is a block diagram showing the main parts of a neutralization system and a neutralization method for ammonia-containing wastewater according to a third embodiment of the present invention, with the control device omitted. [Figure 4] This is a block diagram showing the main parts of a neutralization system and a neutralization method for ammonia-containing wastewater according to a fourth embodiment of the present invention, with the control device omitted. [Figure 5] This is a block diagram showing the main parts of a neutralization system and a neutralization method for ammonia-containing wastewater according to a fifth embodiment of the present invention, with the control device omitted. [Figure 6]This is a block diagram showing the main parts of a neutralization system and a neutralization method for ammonia-containing wastewater according to the sixth embodiment of the present invention, with the control device omitted. [Figure 7] This block shows a neutralization treatment method for ammonia-containing wastewater according to the seventh embodiment of the present invention. [Figure 8] This block shows a neutralization treatment method for ammonia-containing wastewater according to the eighth embodiment of the present invention. [Modes for carrying out the invention]

[0013] [First Embodiment] A neutralization treatment system 100 and a neutralization treatment method for ammonia-containing wastewater according to the first embodiment of the present invention will be described in detail with reference to Figure 1. In the following description, components of the same type are denoted by the same reference numerals and their descriptions are omitted.

[0014] ≪Neutralization treatment system for ammonia-containing wastewater≫ The ammonia-containing wastewater neutralization treatment system 100 shown in Figure 1 (hereinafter referred to as the "neutralization treatment system") is a device for purifying and neutralizing wastewater (hereinafter referred to as "wastewater WF") such as lubricating oil LO, fuel oil, and bilge water containing ammonia (hereinafter referred to as "ammonia AM") and sludge SG. The neutralization treatment system 100 is used to neutralize wastewater WF containing ammonia AM used in engines 200 such as combustion engines installed on ships or in limited onshore installation spaces (for example, island power plants or existing power plants).

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

[0016] The neutralization treatment system 100 includes a cleaner 1. The cleaner 1 is a three-phase separation type separating plate centrifuge that separates a stock solution 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 sludge, which is a solid content (hereinafter referred to as "sludge SG").

[0017] The neutralization treatment system 100 mainly includes a lubricating oil tank 300, a lubricating oil supply pump P, a cleaner 1, a neutralization sludge tank 500, a main sludge tank 600, a neutralizing agent tank 700, a heavy liquid discharge line 120, a stock solution supply line 130, a light liquid discharge line 140, a sludge discharge line 160, a sludge circulation line 170, a neutralizing agent supply line 180, and a washing water discharge line 190.

[0018] ≪Engine≫ For example, the engine 200 shown in FIG. 1 is a marine diesel engine arranged inside a ship, which uses liquid ammonia, which has a zero emission of carbon dioxide, a greenhouse gas, as fuel, and may be a turbine engine. The engine 200 is composed of a mechanism that connects a crankshaft and a piston only with a connecting rod. In the engine 200, a side pressure, which is a lateral force, is generated on the piston, and uneven wear occurs on the cylinder. Therefore, lubricating oil LO is used in the engine 200 to improve the movement of the piston. The engine 200 may also co-fire liquid ammonia and fossil fuels such as natural gas.

[0019] ≪Lubricating Oil Discharge Line≫ The lubricating oil discharge line 150 shown in FIG. 1 is a pipeline for sending the lubricating oil LO (stock solution DO) used in the engine 200 to the lubricating oil tank 300. One end of the lubricating oil discharge line 150 is connected to the engine 200, and the other end is connected to the lubricating oil tank 300.

[0020] <<Lubricating oil tank and lubricating oil>> As shown in Figure 1, the lubricating oil tank 300 is a tank for storing raw DO containing lubricating oil LO used in the engine 200. The raw DO supplied from the engine 200 to the lubricating oil tank 300 contains ammonia AM derived from ammonia fuel. For this reason, the lubricating oil tank 300 is a tank with a lid to prevent vaporized ammonia AM from leaking out of the lubricating oil tank 300. Furthermore, the undiluted DO solution contains water that was introduced in engine 200.

[0021] 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. Ammonia water (AW) may corrode fluororubber O-rings and copper alloy heavy / light liquid impellers used in the air purifier (1). For this reason, it is preferable that these parts be made of corrosion-resistant materials.

[0022] ≪Concentrated Solution Supply Line≫ The raw material supply line 130 shown in Figure 1 is a piping system for supplying raw material 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 material supply line 130 consists of a heater upstream line 131 from the lubricating oil tank 300 to the heater 400, and a heater downstream line 132 from the heater 400 to the purifier 1. A lubricating oil supply pump P1 is provided in the heater upstream line 131, and a three-way valve 134 is provided in the heater downstream line 132.

[0023] Lubrication oil supply pump The lubricating oil supply pump P1 is a pump that sends the undiluted DO from the lubricating oil tank 300 to the purifier 1 via the heater 400 through the undiluted oil supply line 130. As shown in Figure 1, the undiluted DO in the heater upstream line 131 is mixed with aqueous ammonia AW.

[0024] Heater Heater 400 is an oil heater that heats the lubricating oil LO that is sent to the purifier 1. Heater 400 can improve the separation efficiency of solids and / or water in the purifier 1 by heating the lubricating oil LO and lowering its viscosity. As shown in Figure 1, the raw liquid DO in the heater downstream line 132 is mixed with aqueous ammonia AW and sludge SG.

[0025] <<Light liquid discharge line>> The light liquid discharge line 140 is a flow path for returning the lubricating oil LO (light liquid) purified by the purifier 1 back to the lubricating oil tank 300. The light liquid discharge line 140 consists of a piping route from the discharge port of the purifier 1 to the lubricating oil supply port of the lubricating oil tank 300.

[0026] ≪Air Purifier≫ Purifier 1 is a device for separating / removing sludge SG (solid component) and ammonia water AW contained in the raw DO containing lubricating oil LO used in an engine 200 that uses ammonia AM as fuel, from the lubricating oil LO. Purifier 1 may be, for example, a separation plate type centrifuge that separates the raw DO into three phases of liquid (light liquid) - liquid (heavy liquid) - solid component by the centrifugal force of a rotating body that rotates at high speed, and may be modified as appropriate.

[0027] <Sludge discharge line> The sludge discharge line 160 is a discharge route for discharging waste liquid WF containing sludge SG, which has been centrifuged 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 neutralization sludge tank 500 and the main sludge tank 600 via the sludge circulation line 170. The waste liquid WF containing sludge SG in the purifier 1 is discharged into the sludge discharge line 160 and stored in the neutralization sludge tank 500, and 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 the neutralizing agent N supplied from the neutralizing agent tank 700 via the neutralizing agent supply line 180.

[0028] <Washing water discharge line> To remove residual ammonia gas (AG) from the air purifier 1, cleaning water is supplied to dissolve the ammonia gas (AG) inside the air purifier 1, thereby cleaning the inside of the air purifier 1. The cleaning water discharge line 190 is a discharge channel for discharging the cleaning water injected into the frame of the air purifier 1. Therefore, the cleaning water that has taken in ammonia gas (AG) from the frame of the air purifier 1 is discharged into the neutralization sludge tank 500.

[0029] <Sludge Tank> The neutralization sludge tank 500 shown in Figure 1 is a tank for storing and neutralizing waste liquid WF containing sludge SG separated by the purifier 1. 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 outlet to the neutralization sludge tank 500 via the sludge discharge line 160. 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 line 170, and a neutralizing agent supply line 180. Note that there may be multiple neutralization sludge tanks 500. Also, if the sensor 520 is installed in the sludge circulation line 170 described later, it does not need to be installed in the neutralization sludge tank 500.

[0030] The sludge tank vapor outlet 510 is an outlet for discharging gases, vapors, etc., generated in the neutralization sludge tank 500. Sensor 520 is a measuring instrument for measuring the hydrogen ion concentration, ammonia concentration, etc., of waste liquid WF containing sludge SG stored in the neutralization sludge tank 500. Sensor 520 can be, for example, a pH meter or an ammonia sensor. Below, sensor 520 will be explained using a pH meter as an example. By measuring the pH of waste liquid WF in the neutralization sludge tank 500, sensor 520 can efficiently neutralize waste liquid WF by adding the optimal amount of neutralizing agent N to the waste liquid WF according to the measured value.

[0031] <Level switch> 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 be capable of detecting the amount of waste liquid WF containing sludge SG stored in the neutralization sludge tank 500, and may be replaced with other sensors as appropriate. For example, the level switch 530 is configured to include a high level switch LSH and a low level switch LSL.

[0032] The high-level switch LSH is a switch that activates 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 a predetermined 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 can prevent the neutralization sludge tank 500 from overflowing.

[0033] The low-level switch LSL is a switch that activates 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 a predetermined low position, the low-level switch LSL starts supplying from the purifier 1, the sludge circulation line 170, or the neutralizing agent supply line 180. In this way, the low-level switch LSL can prevent the neutralization sludge tank 500 from becoming empty.

[0034] <Sludge circulation line> The sludge circulation line 170 is a flow path that circulates the waste liquid WF containing sludge SG stored in the neutralization sludge tank 500, by discharging it from the neutralization sludge tank 500 and returning it to the neutralization sludge tank 500, in order to efficiently neutralize the waste liquid WF containing sludge SG. The sludge circulation line 170 is equipped with a sludge transfer pump 171 and a switching valve 172, and is connected to the main sludge tank transfer line 601. A sensor 520 may also be provided in the sludge circulation line 170.

[0035] <Sludge Transfer Pump> The sludge transfer pump 171 is a pump used to transfer and agitate waste liquid WF containing sludge SG in the sludge circulation line 170. The sludge transfer pump 171 is located in the sludge circulation line 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 an electrical signal from the control device 900.

[0036] <Switching valve> The switching valve 172 is a three-way valve for switching the direction of movement of ammonia-containing waste liquid WF flowing through the sludge circulation line 170 between the neutralization sludge tank 500 side and the main sludge tank transfer line 601 side. The switching valve 172 is located in the sludge circulation line 170, downstream of the sludge transfer pump 171, and is positioned between the sludge transfer pump 171 and the neutralization sludge tank 500. The switching valve 172 is electrically connected to the control device 900 and is opened and closed by an electrical signal from the control device 900.

[0037] <Main sludge tank transfer line> The main sludge tank transfer line 601 is a flow path for supplying ammonia-containing waste liquid WF, which circulates from the neutralization sludge tank 500 through the sludge circulation line 170, to the main sludge tank 600. One end of the main sludge tank transfer line 601 is connected to the switching valve 172, and the other end is connected to the main sludge tank 600.

[0038] <Main sludge tank> The main sludge tank 600 shown in Figure 1 is a tank for storing neutral liquid waste (hereinafter referred to as "neutral liquid waste NLW") that has been neutralized in the neutralization sludge tank 500 by neutralizers (hereinafter referred to as "neutralizer N") from the neutralizer tank 700.

[0039] <Neutralizing agent tank> The neutralizing agent tank 700 is a tank for storing the neutralizing agent N, which is used to neutralize and render harmless ammonia-containing waste liquid WF. The neutralizing agent tank 700 is equipped with a neutralizing agent supply line 180.

[0040] <Neutralizing agent> The neutralizing agent N is used to neutralize the ammonia-containing waste liquid WF in the neutralization sludge tank 500, and consists of an acidic component such as citric acid. The neutralizing agent N can be a solid (including powder (crystalline state) or liquid) as long as it neutralizes the ammonia-containing waste liquid WF. The neutralizing agent N is introduced into the ammonia-containing waste liquid WF in the neutralization sludge tank 500 from the neutralizing agent supply line 180. The neutralizing agent N is supplied according to the pH measurement value, ammonia concentration measurement value, etc. of the ammonia-containing waste liquid WF detected by the sensor 520, and neutralizes the ammonia-containing 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 (anhydrous citric acid (C6H8O7) or crystalline 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 aqueous ammonia AW, ammonium iron citrate is produced. The neutralizing agent N and the detoxifying agent can be solid or liquid.

[0041] <Neutralizing agent supply line> The neutralizing agent supply line 180 is a flow path for supplying the 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.

[0042] The neutralizing agent transfer pump 181 is a pump that sucks up the neutralizing agent N from the neutralizing agent tank 700 and sends it from the neutralizing agent supply line 180 to the neutralizing sludge tank 500. The check valve 182 is a valve that restricts the direction in which the neutralizing agent N flows through the neutralizing agent supply line 180 so that it flows from the neutralizing agent tank 700 towards the neutralizing sludge tank 500. In other words, the check valve 182 is a valve that prevents the neutralizing agent from flowing from the neutralizing sludge tank 500 towards the neutralizing agent tank 700.

[0043] ≪Control device≫ The control device 900 is a device that is electrically connected to and controls the purifier 1, sensor 520, level switch 530, sludge transfer pump 171, switching valve 172, and neutralizing agent transfer pump 181. When the pH detected by sensor 520 or the ammonia concentration falls below a threshold, the control device 900 operates the sludge transfer pump 171 and the switching valve 172 to supply ammonia-containing waste liquid WF from the sludge circulation line 170 to the main sludge tank 600.

[0044] Furthermore, when the pH or ammonia concentration detected by the sensor 520 exceeds a threshold, the control device 900 activates the neutralizing agent transfer pump 181 to supply the neutralizing agent N from the neutralizing agent supply line 180 to the neutralization sludge tank 500, thereby neutralizing the ammonia-containing waste liquid WF.

[0045] 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 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 agitates it.

[0046] 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 operates 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 agitates it, and also operates the neutralizing agent transfer pump 181 to supply the neutralizing agent N from the neutralizing agent supply line 180 to the neutralization sludge tank 500 and neutralize the ammonia-containing waste liquid WF.

[0047] Furthermore, the control device 900 drives the purifier 1, the sludge transfer pump 171, and the neutralizing agent transfer pump 181.

[0048] ≪Effect≫ Next, with reference to Figure 1, the operation of the ammonia-containing wastewater WF neutralization treatment system 100 and the ammonia-containing wastewater WF neutralization treatment method according to the first embodiment of the present invention will be explained.

[0049] As shown in Figure 1, the lubricating oil LO (undiluted DO) used in engine 200 is stored in lubricating oil tank 300 and then introduced into the cleaner 1 from the undiluted oil supply line 130.

[0050] The ammonia water AW and sludge SG (waste liquid WF) separated by the purifier 1 shown in Figure 1 are discharged into the neutralization sludge tank 500 from the sludge discharge line 160. On ships, sludge (SG) must be unloaded and treated as industrial waste. However, if the ammonia concentration of the sludge (SG) is high, unloading may be refused. Therefore, it is preferable to neutralize wastewater (WF) containing ammonia (AM) on board the ship.

[0051] If gas or vapor is generated in the neutralization sludge tank 500, it will be discharged from the sludge tank vapor outlet 510. During neutralization, the amount of sludge SG stored in the neutralization sludge tank 500 is detected by the level switch 530.

[0052] In the neutralization sludge tank 500, as shown in Figure 1, at least one of the pH and ammonia concentration of the waste liquid WF stored in the neutralization sludge tank 500 is measured by the sensor 520 (measurement step). Then, according to at least one of the pH value of the waste liquid WF measured by the sensor 520 and the ammonia concentration value of the waste liquid WF, neutralizing agent N is added to the waste liquid WF in the neutralization sludge tank 500 to neutralize the waste liquid WF (neutralization step).

[0053] The neutralized waste liquid WF from the neutralization sludge tank 500 is circulated through the sludge circulation line 170 by the sludge transfer pump 171 and supplied to the neutralization sludge tank 500, where it is agitated (agitation process). In this way, the waste liquid WF containing ammonia AM can be efficiently neutralized.

[0054] Then, 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 measured by the sensor 520, it continues the circulation and stirring. During circulation and stirring, the control device 900 drives the neutralizing agent transfer pump 181 to continue supplying the neutralizing agent N to the neutralization sludge tank 500.

[0055] When the control device 900 determines that neutralization has been achieved to a complete level 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 line 170 to the main sludge tank 600 for storage.

[0056] Except in emergencies such as a problem with the purifier 1 or the system causing the liquid level in the neutralizing agent tank 700 to rise to an emergency level, all waste liquid WF sent to the main sludge tank 600 can be neutralized.

[0057] In this way, the wastewater WF is circulated and neutralized to a predetermined pH value or ammonia concentration, and stored in the main sludge tank 600 as neutral wastewater NLW. Therefore, when the neutralization treatment system 100 is used for bilge treatment, the ammonia-containing wastewater WF accumulated at the bottom of the ship can be neutralized to a safe level, making it possible to discharge it overboard after treatment with a bilge separator.

[0058] The neutralization treatment system 100 according to the first embodiment, as shown in Figure 1, is a neutralization treatment system 100 for ammonia-containing waste liquid WF that contains ammonia AM, and comprises one or more neutralization sludge tanks 500, a sludge discharge line 160 for supplying ammonia-containing waste liquid WF to the neutralization sludge tanks 500, a neutralizing agent supply line 180 for supplying a neutralizing agent N to the neutralization sludge tanks 500, a sludge circulation line 170 for discharging the ammonia-containing waste liquid WF stored in the neutralization sludge tanks 500 and returning it to the neutralization sludge tanks 500, and a sludge transfer pump 171 provided in the sludge circulation line 170 for moving the ammonia-containing waste liquid WF.

[0059] With this configuration, the neutralization treatment system 100 has a neutralizing agent supply line 180, which allows it to supply the neutralizing agent N to the neutralization sludge tank 500 to neutralize the ammonia-containing waste liquid WF. Furthermore, the neutralized ammonia-containing waste liquid WF in the neutralization sludge tank 500 can be agitated by circulating it through the sludge circulation line 170 using the power of the sludge transfer pump 171 and supplying it back to the neutralization sludge tank 500. As a result, the ammonia-containing waste liquid WF, which contains ammonia AM and other substances mixed in the lubricating oil LO, can be neutralized to a safe level after separation, enabling the sludge SG to be unloaded and incinerated by a boiler on board the ship. Furthermore, when the neutralization treatment system 100 is used for bilge treatment, it can neutralize the ammonia-containing wastewater WF accumulated at the bottom of the ship to a safe level, making it possible to discharge it overboard after treatment with a bilge separator.

[0060] Furthermore, the neutralization treatment system 100 includes a purifier 1 that separates the raw liquid DO, which contains lubricating oil LO used in an engine 200 that uses ammonia AM as fuel, into lubricating oil LO, sludge SG, and ammonia water AW, and converts it into ammonia-containing waste liquid WF.

[0061] In this configuration, the presence of the purifier 1 allows for the separation and removal of the undiluted DO into lubricating oil LO, sludge SG, and ammonia water AW, making it easier to dispose of the sludge SG and ammonia AM.

[0062] Furthermore, as shown in Figure 1, the neutralization treatment system 100 comprises a main sludge tank 600 for storing neutral waste liquid NLW after neutralizing ammonia-containing waste liquid WF, and a main sludge tank transfer line 601 that branches off from the sludge circulation line 170 to supply neutral waste liquid NLW to the main sludge tank 600. The sludge circulation line 170 is also equipped with the main sludge tank transfer line 601 and a switching valve 172 for switching the direction of movement of ammonia-containing waste liquid WF in the sludge circulation line 170.

[0063] With this configuration, the neutralization treatment system 100 has a sludge circulation line 170, which allows the ammonia-containing waste liquid WF neutralized in the neutralization sludge tank 500 to be circulated and returned, enabling multiple neutralization cycles. Furthermore, the neutralization treatment system 100 has a switching valve 172, which allows the ammonia-containing waste liquid WF of the neutralizing agent N flowing through the sludge circulation line 170 to be flowed into the main sludge tank 600 for storage.

[0064] Furthermore, as shown in Figure 1, the neutralization sludge tank 500 is equipped with a sensor 520 that measures the pH or ammonia concentration of the ammonia-containing waste liquid WF, installed in either the neutralization sludge tank 500 or the sludge circulation line 170, or both. A control device 900 controls 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 falls below a threshold, the control device 900 switches the switching valve 172 to supply the neutralized ammonia-containing waste liquid WF to the main sludge tank 600 and operates the sludge transfer pump 171.

[0065] In this configuration, once the sensor 520 detects that the pH and ammonia concentration of the ammonia-containing waste liquid WF in the neutralization sludge tank 500 have been neutralized to an appropriate level, it can be sent to the main sludge tank 600 for storage.

[0066] Furthermore, as shown in Figure 1, 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 installed in either the neutralization sludge tank 500 or the sludge circulation line 170, or both. The sensor 520 and the sludge transfer pump 171 are connected to the control device 900. The neutralizing agent supply line 180 is equipped with a neutralizing agent transfer pump 181 for supplying the 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 exceeds a threshold, the control device 900 operates the neutralizing agent transfer pump 181 to supply the neutralizing agent N from the neutralizing agent supply line 180 to the neutralization sludge tank 500 to neutralize the ammonia-containing waste liquid WF.

[0067] In this configuration, if the pH or ammonia concentration of the ammonia-containing waste liquid WF in the neutralization sludge tank 500 is high, the sensor 520 can detect the concentration and activate the neutralizing agent transfer pump 181. Therefore, the neutralizing agent transfer pump 181 can supply the 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.

[0068] Furthermore, as shown in Figure 1, the neutralization sludge tank 500 is equipped with a sensor 520 that measures the pH or ammonia concentration of the ammonia-containing waste liquid WF, installed in either the neutralization sludge tank 500 or the sludge circulation line 170, or both. The sensor 520 and the sludge transfer pump 171 are connected to a 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 operates 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 agitates it.

[0069] In this configuration, the sensor 520 allows for detection and confirmation of whether the neutralization of the ammonia-containing waste liquid WF in the neutralization sludge tank 500 is incomplete. If the neutralization is incomplete, the control device 900 can supply the ammonia-containing waste liquid WF from the sludge circulation line 170 to the neutralization sludge tank 500 and circulate and agitate it to promote neutralization.

[0070] Furthermore, as shown in Figure 1, the neutralizing agent supply line 180 is equipped with a neutralizing agent transfer pump 181 for supplying the neutralizing agent N stored in the neutralizing agent tank 700 to the neutralizing sludge tank 500. The control device 900, when it determines that the neutralization of the ammonia-containing waste liquid WF is incomplete based on the pH detected by the sensor 520 or the ammonia concentration, 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 agitates it, and also operates the neutralizing agent transfer pump 181 to supply the neutralizing agent N from the neutralizing agent supply line 180 to the neutralizing sludge tank 500 and neutralize the ammonia-containing waste liquid WF.

[0071] In this configuration, when the ammonia-containing waste liquid WF is circulating in the sludge circulation line 170, the control device 900 activates the neutralizing agent transfer pump 181 to automatically supply the neutralizing agent N to the neutralization sludge tank 500 for efficient agitation.

[0072] Furthermore, as shown in Figure 1, the control device 900 drives the purifier 1, the sludge transfer pump 171, and the neutralizing agent transfer pump 181.

[0073] In this configuration, the control device 900 can drive the purifier 1, the sludge transfer pump 171, and the neutralizing agent transfer pump 181 in conjunction. Therefore, the present invention can efficiently neutralize the ammonia-containing waste liquid WF discharged from the purifier 1, thereby eliminating environmental impact.

[0074] As shown in Figure 1, this is a method for neutralizing ammonia-containing wastewater WF containing ammonia AM, wherein a neutralizing agent N is supplied from a neutralizing agent supply line 180 to a neutralization sludge tank 500 in which the ammonia-containing wastewater WF is stored to neutralize the ammonia-containing wastewater WF, and the neutralized ammonia-containing wastewater WF in the neutralization sludge tank 500 is circulated through the sludge circulation line 170 by a sludge transfer pump 171 provided in the sludge circulation line 170 and supplied to the neutralization sludge tank 500 to agitate it.

[0075] In this configuration, the ammonia-containing waste liquid WF can be neutralized by supplying the neutralizing agent N from the neutralizing agent supply line 180 to the neutralizing sludge tank 500. Furthermore, the ammonia-containing waste liquid WF in the neutralizing sludge tank 500 can be agitated by circulating it through the sludge circulation line 170 using the power of the sludge transfer pump 171 and supplying it to the neutralizing sludge tank 500. As a result, the ammonia-containing waste liquid WF, which contains ammonia AM and other substances mixed in the lubricating oil LO, can be neutralized to a safe level after separation, enabling the unloading of the sludge SG and incineration on board the ship.

[0076] Furthermore, as shown in Figure 1, the neutralization treatment method for ammonia-containing waste liquid WF involves supplying the ammonia-containing waste liquid WF, which has been neutralized in the neutralization sludge tank 500, to the main sludge tank 600 via the sludge circulation line 170 for storage.

[0077] In this configuration, the ammonia-containing waste liquid WF, neutralized in the neutralization sludge tank 500, is supplied to the main sludge tank 600 from the sludge circulation line 170 for storage, thus enabling the neutralization of large quantities of ammonia-containing waste liquid WF.

[0078] [Second Embodiment] It should be noted that the present invention is not limited to the first embodiment described above, and various modifications and changes are possible within the scope of its technical concept, and the present invention naturally extends to such modified and altered inventions as well.

[0079] Figure 2 is a block diagram showing the main parts of a neutralization treatment system 100A and a neutralization treatment method for ammonia-containing wastewater WF according to a second embodiment of the present invention, with the control device omitted.

[0080] As shown in Figure 2, the sludge circulation line 170 may be equipped with a static mixer 173A (also called an "in-line mixer") for mixing ammonia-containing waste liquid WF with the neutralizing agent N. In this case, the static mixer 173A is installed in the sludge circulation line 170 between the neutralization sludge tank 500 and the sludge transfer pump 171. The Static Mixer 173A can mix without using any power, and this configuration allows for efficient mixing of ammonia-containing waste liquid WF and neutralizing agent N.

[0081] [Third Embodiment] Figure 3 is a block diagram showing the main parts of the ammonia-containing wastewater WF neutralization treatment system 100B and ammonia-containing wastewater WF neutralization treatment method according to the third embodiment of the present invention, with the control device omitted.

[0082] The static mixer 173A of the second embodiment shown in Figure 2 may be installed between the switching valve 172 of the sludge circulation line 170 and the neutralization sludge tank 500, as shown in the static mixer 173B of Figure 3. Even in this manner, the neutralization treatment system 100B exhibits the same effects and advantages as the neutralization treatment system 100 of the second embodiment.

[0083] [Fourth Embodiment] Figure 4 is a block diagram showing the main parts of a neutralization treatment system 100C and a neutralization treatment method for ammonia-containing wastewater WF according to the fourth embodiment of the present invention, with the control device omitted.

[0084] The static mixer 173A of the second embodiment shown in Figure 2 may be installed between the sludge transfer pump 171 and the switching valve 172 of the sludge circulation line 170, as shown in the static mixer 173C of Figure 4. Even in this manner, the neutralization treatment system 100C exhibits the same effects and advantages as the neutralization treatment system 100 of the second embodiment.

[0085] [Fifth Embodiment] Figure 5 is a block diagram showing the main parts of the ammonia-containing wastewater WF neutralization treatment system 100D and ammonia-containing wastewater WF neutralization treatment method according to the fifth embodiment of the present invention, with the control device omitted.

[0086] The neutralizing agent supply line 180 of the third embodiment shown in Figure 3 may be connected between the switching valve 172 of the sludge circulation line 170 and the static mixer 173B, as shown in the neutralizing agent supply line 180D in Figure 5. Even in this manner, the neutralization treatment system 100D exhibits the same effects and advantages as the neutralization treatment system 100 of the second embodiment.

[0087] [Sixth Embodiment] Figure 6 is a block diagram showing the main parts of the ammonia-containing wastewater WF neutralization treatment system 100E and ammonia-containing wastewater WF neutralization treatment method according to the sixth embodiment of the present invention, with the control device omitted.

[0088] In the neutralization treatment system 100B of the third embodiment shown in Figure 3, a second neutralizing agent supply line 180E branched from the neutralizing agent supply line 180 may be connected to the sludge circulation line 170, as in the neutralization treatment system 100E shown in Figure 6. In this case, the second neutralizing agent supply line 180E is branched off, for example, from between the check valve 182 and the neutralizing sludge tank 500, and its downstream side is connected between the static mixer 173B and the switching valve 172.

[0089] In this configuration, by providing a second neutralizing agent supply line 180E, the neutralizing agent N in the neutralizing agent supply line 180 is also supplied to the sludge circulation line 170, enabling efficient neutralization of the ammonia-containing waste liquid WF.

[0090] [Seventh Embodiment] Figure 7 is a block diagram showing a neutralization treatment method for ammonia-containing wastewater WF according to the seventh embodiment of the present invention. The neutralization treatment method for ammonia-containing wastewater WF according to the seventh embodiment of the present invention will be described with reference to Figures 1 and 7.

[0091] Onboard, the lubricating oil LO used in engine 200 becomes a stock solution DO containing ammonia water AW and sludge SG (see Figure 1). This stock solution DO is centrifuged by a purifier 1 into sludge SG, ammonia water AW, and lubricating oil LO (sludge separation step 11).

[0092] The sludge SG separated by the purifier 1 is discharged from the purifier 1 as shown in Figure 7 (sludge discharge step 12). The sludge SG is then reduced in volume and stored in a storage container such as a drum with the opening sealed (sludge storage step 13).

[0093] Next, the sludge SG stored in storage containers such as drums is incinerated in the ship's incinerator to produce incinerated ash (sludge incineration process 14). Subsequently, the sludge SG that has become incinerated ash is scraped out of the incinerator (incinerated ash scraping process 15). The incinerated ash scraped out of the incinerator is stored in storage containers such as drums with the openings sealed, and stored in the ship's engine room (incinerated ash storage process 16).

[0094] The sludge SG, which has been incinerated and packed into storage containers such as drums, is then unloaded as industrial waste when the ship docks at a port, transported by truck to a disposal site, and disposed of. In this way, the waste liquid WF containing ammonia AM generated on board the ship is incinerated on board to produce incinerated ash, which is then packed into storage containers such as drums for storage, before being unloaded and disposed of.

[0095] [Eighth Embodiment] Figure 8 is a block diagram showing a neutralization treatment method for ammonia-containing waste liquid WF according to the eighth embodiment of the present invention. Next, with reference to Figure 8, a neutralization treatment method for ammonia-containing waste liquid WF according to the eighth embodiment of the present invention will be described.

[0096] Onboard, the system oil used in engine 200 and accumulated in the crankcase becomes raw DO containing ammonia water AW and sludge SG (see Figure 1). This raw DO is then removed from engine 200 (system oil removal process 11B).

[0097] The system oil extracted from engine 200 is transferred to a sump tank for storage, as shown in Figure 9 (sump tank storage process 12B). The volatile gases that remain in the sump tank become highly concentrated and are discharged to the outside through a pipe air vent located at the top of the sump tank.

[0098] The undiluted DO remaining in the sump tank is then sucked up by a transfer pump and sent to the purifier 1 (transfer pump transfer process 13B). The undiluted DO sent to the purifier 1 is then centrifuged by the purifier 1 into sludge SG, ammonia water AW, and lubricating oil LO in the purifier cleaning process 14B, and is then either returned to the sump tank or transferred to the sludge tank as waste liquid WF consisting of sludge SG and ammonia water AW.

[0099] The waste liquid WF sent to the sludge tank is subjected to heating and evaporation treatment within the sludge tank (heating and evaporation treatment step 15B). As a result, steam and gas are generated within the waste oil tank. This steam and gas within the waste oil tank are then discharged outside the waste oil tank.

[0100] The waste liquid WF remaining in the sludge tank is sucked up by a sludge pump and sent to the waste oil tank (system oil transfer process 16B). The waste liquid WF transferred to the waste oil tank is subjected to heating and evaporation treatment (heating and evaporation treatment process 17B). As a result, steam and gas are generated in the waste oil tank. The steam and gas in the waste oil tank are then discharged outside the waste oil tank.

[0101] The waste liquid WF remaining in the waste oil tank is sent to an incinerator for incineration (sludge incineration process 18B). The incineration smoke generated during the incineration process is discharged to the outside from the incinerator. In this way, the system oil containing ammonia AM generated on board the ship is disposed of by heating and evaporation treatment and sludge incineration treatment on board the ship.

[0102] [Differentiation] In the first to sixth embodiments described above (see Figures 1 to 6), the neutralization treatment systems 100, 100A, 100B, 100C, 100D, and 100E were described in the case of having one purifier 1, but multiple purifiers 1 may be used. In that case, multiple neutralization sludge tanks 500 to which waste liquid WF is supplied from purifier 1, and multiple main sludge tanks 600 to which neutral waste liquid NLW is stored may be used. [Explanation of symbols]

[0103] 1. Air purifier 100, 100A, 100B, 100C, 100D, 100E Neutralization treatment system for ammonia-containing wastewater (neutralization treatment system) 160 Sludge discharge line 170 Sludge circulation line 171 Sludge Transfer Pump 172 Switching valve 173A Static Mixer 180 Neutralizing agent supply line 181 Neutralizing agent transfer pump 200 institutions 500 Neutralization sludge tank 520 sensors 600 Main sludge tank 601 Main sludge tank transfer line 700 Neutralizing agent tank 900 Control Unit AM Ammonia AW Ammonia Water DO stock solution LO lubricant N Neutralizing agent SG Sludge WF Ammonia-containing waste liquid (waste liquid)

Claims

1. A neutralization treatment system for ammonia-containing wastewater that neutralizes ammonia-containing wastewater, One or more neutralization sludge tanks, A sludge discharge line for supplying the ammonia-containing waste liquid to the neutralization sludge tank, A neutralizing agent supply line for supplying a neutralizing agent to the neutralization sludge tank, A sludge circulation line for discharging the ammonia-containing waste liquid stored in the neutralization sludge tank from the neutralization sludge tank and returning it to the neutralization sludge tank, A sludge transfer pump is provided in the sludge circulation line for moving the ammonia-containing waste liquid, Equipped with, A system for neutralizing ammonia-containing wastewater.

2. The system includes a purifier that separates a raw liquid containing lubricating oil used in an ammonia-fueled engine into the lubricating oil, sludge, and ammonia water, and uses the ammonia-containing waste liquid as a result. A neutralization treatment system for ammonia-containing wastewater according to claim 1.

3. A main sludge tank for storing neutral wastewater after neutralizing the ammonia-containing wastewater, The system comprises a main sludge tank transfer line branching off from the aforementioned sludge circulation line to supply the neutral waste liquid to the main sludge tank, Furthermore, the sludge circulation line includes: A switching valve is provided to switch the direction of movement of the ammonia-containing waste liquid in the main sludge tank transfer line and the sludge circulation line. A neutralization treatment system for ammonia-containing wastewater according to claim 1 or claim 2.

4. A sensor for measuring the pH or ammonia concentration of the ammonia-containing waste liquid is installed in either the neutralization sludge tank or the sludge circulation line, or both. A control device is provided that controls the sludge transfer pump and the switching valve based on the signal from the sensor. The control device controls the operation of the sludge transfer pump by switching the switching valve to supply neutralized ammonia-containing waste liquid to the main sludge tank when the pH or ammonia concentration detected by the sensor falls below a threshold. A neutralization treatment system for ammonia-containing wastewater according to claim 3.

5. A sensor for measuring the pH or ammonia concentration of the ammonia-containing waste liquid is installed in either the neutralization sludge tank or the sludge circulation line, or both. The sensor and the sludge transfer pump are connected to the control device. The neutralizing agent supply line includes a neutralizing agent transfer pump for supplying the neutralizing agent stored in the neutralizing agent tank to the neutralizing sludge tank. The control device operates the neutralizing agent transfer pump when the pH or ammonia concentration detected by the sensor exceeds a threshold, thereby supplying the neutralizing agent from the neutralizing agent supply line to the neutralization sludge tank to neutralize the ammonia-containing wastewater. A neutralization treatment system for ammonia-containing wastewater according to claim 1.

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

7. The neutralizing agent supply line includes 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, based on the pH or ammonia concentration detected by the sensor, that the neutralization of the ammonia-containing wastewater is incomplete, it operates the sludge transfer pump to supply the ammonia-containing wastewater from the sludge circulation line to the neutralization sludge tank and circulates and agitates it, and also operates the neutralizing agent transfer pump to supply the neutralizing agent from the neutralizing agent supply line to the neutralization sludge tank and neutralize the ammonia-containing wastewater. A neutralization treatment system for ammonia-containing wastewater according to claim 6.

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

9. The sludge circulation line is provided with a static mixer or in-line mixer for mixing the ammonia-containing waste liquid with the neutralizing agent. A neutralization treatment system for ammonia-containing wastewater according to claim 1.

10. The aforementioned neutralizing agent supply line has a second neutralizing agent supply line branched off from it and connected to the sludge circulation line. A neutralization treatment system for ammonia-containing wastewater according to claim 1.

11. A method for neutralizing ammonia-containing wastewater, which contains ammonia, The ammonia-containing waste liquid is neutralized by supplying a neutralizing agent from the neutralizing agent supply line to the neutralization sludge tank where the ammonia-containing waste liquid is stored. The ammonia-containing waste liquid from the neutralization sludge tank, which has been neutralized, is circulated through the sludge circulation line by a sludge transfer pump installed in the sludge circulation line and supplied to the neutralization sludge tank, thereby agitating it. A method for neutralizing ammonia-containing wastewater.

12. The ammonia-containing waste liquid neutralized in the neutralization sludge tank is supplied from the sludge circulation line to the main sludge tank for storage. The method for neutralizing ammonia-containing wastewater according to claim 11.

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

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