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JP-2026074822-A - Ammonia-containing wastewater neutralization system and ammonia-containing wastewater neutralization method

JP2026074822AJP 2026074822 AJP2026074822 AJP 2026074822AJP-2026074822-A

Abstract

[Problem] To enable the neutralization of ammonia mixed in lubricating oil to a safe level after separation, 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. [Selection Diagram] Figure 1

Inventors

  • 齋藤 俊馬
  • 大谷 洋一郎
  • 松成 賢司

Assignees

  • 三菱化工機株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (13)

  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 includes a main sludge tank transfer line that branches off from the 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.

Description

This invention relates to a neutralization system for ammonia-containing wastewater and a method for neutralizing ammonia-containing wastewater. Ammonia fuel, considered a carbon-neutral fuel, may contaminate lubricating oil when used in generators, ammonia combustion engines, and other applications on ships. If ammonia contaminates the lubricating oil, and the sludge and separated water discharged from the lubricating oil purifier contain ammonia, exceeding the ship's regulation odor concentration of 25 ppm, the sludge and separated water cannot be incinerated or unloaded. To reduce the impact of ammonia gas or ammonia water generated on such ships on human health and the environment, for example, the ammonia water storage system and ammonia-fueled ship described in Patent Document 1 are known. The ammonia water storage system described in Patent Document 1 comprises 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 from the ammonia water storage tank overboard. Japanese Patent Publication No. 2023-93265 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.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.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.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.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.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.This block shows a neutralization treatment method for ammonia-containing wastewater according to the seventh embodiment of the present invention.This block shows a neutralization treatment method for ammonia-containing wastewater according to the eighth embodiment of the present invention. [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 will be denoted by the same reference numerals and their descriptions will be omitted. ≪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). 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 they contain 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, there is a possibility that sludge SG and ammonia water AW may be mixed into the lubricating oil LO inside the engine 200. The neutralization treatment system 100 is equipped with a purifier 1. The purifier 1 is a three-phase separation type separator with a separation plate that separates the raw lubricating oil LO (LO) contaminated with ammonia water (AW) into a light liquid (purified lubricating oil LO), a heavy liquid (ammonia water AW containing ammonia AM), and sludge (SLD) (SLD SG), which is the solid component. The neutralizati