JP-2026075777-A - Water quality assessment system

Abstract

【assignment】 The objective of the present invention is to provide a water quality determination system that can determine water quality with an overall simple configuration. [Solution] The above objective can be solved by a water quality determination system comprising a chlorine supply means, a chlorine concentration measuring means, and a determination means, wherein the chlorine supply means is capable of supplying chlorine to the object to be determined, the chlorine concentration measuring means is capable of measuring the free chlorine concentration of the object to be determined to which chlorine has been supplied by the chlorine supply means, and the determination means is capable of determining the water quality of the object to be determined by comparing the free chlorine concentration measured by the chlorine concentration measuring means with an indicator chlorine concentration. [Selection Diagram] Figure 3

Inventors

• キルゼンブラト ロマン
• 向原 穂高
• 佐久間 秋穂
• ラドジンスキ テオ

Assignees

• ＷＯＴＡ株式会社

Dates

Publication Date

20260511

Application Date

20241023

Claims (5)

1. A water quality determination system, It comprises a chlorine supply means, a chlorine concentration measuring means, and a determination means, The chlorine supply means is capable of supplying chlorine to the object to be determined, The chlorine concentration measuring means is capable of measuring the free chlorine concentration of the object to be determined, to which chlorine has been supplied by the chlorine supply means. The determination means is a water quality determination system that can determine the water quality to be determined by comparing the free chlorine concentration measured by the chlorine concentration measuring means with an indicator chlorine concentration.
2. A nitrification reaction determination system, The system comprises the water quality determination system described in claim 1 and a biological treatment tank. The biological treatment tank is capable of accommodating the object to be subjected to biological treatment, The chlorine supply means is capable of supplying chlorine to the object to be judged that has been subjected to biological treatment in the biological treatment tank. The chlorine concentration measuring means is capable of measuring the free chlorine concentration of the object to be determined, to which chlorine has been supplied by the chlorine supply means. The determination means is a nitrification reaction determination system capable of determining the state of the nitrification reaction of the target subject to biological treatment in the biological treatment tank by comparing the free chlorine concentration measured by the chlorine concentration measuring means with an indicator chlorine concentration.
3. The nitrification reaction determination system according to claim 2, wherein the determination means determines that the nitrification reaction has been completed when the free chlorine concentration measured by the chlorine concentration measuring means matches the index chlorine concentration, and determines that the nitrification reaction has not been completed when the free chlorine concentration measured by the chlorine concentration measuring means does not match the index chlorine concentration.
4. The nitrification reaction determination system according to claim 2 or 3, wherein the chlorine supply means is performed by electrolyzing chloride ions contained in water.
5. A method for determining nitrification reaction, A process of supplying chlorine to a test subject subjected to biological treatment and measuring the free chlorine concentration of the test subject to which chlorine has been supplied, A method for determining a nitrification reaction, comprising the step of determining the state of the nitrification reaction of a target subject to biological treatment by comparing the measured free chlorine concentration with an indicator chlorine concentration.

Description

This invention relates to a water quality determination system for determining water quality, and more specifically, to a nitrification reaction determination system and a nitrification reaction determination method for determining the state of nitrification reaction of a target material subjected to biological treatment. Knowing the water quality of treated water is extremely important for quality control of treated water. For example, biological treatment using nitrification-denitrification reactions is used to treat nitrogen compounds in domestic wastewater discharged from drainage facilities such as washrooms, toilets, bathrooms, laundry rooms, and kitchens. Through biological treatment, nitrogen compounds are released into the atmosphere as nitrogen gas via nitric acid. However, if the wastewater contains a large amount of nitrogen compounds, or if the concentration of nitrogen compounds in the wastewater is high, the nitrification reaction may not be sufficient, and the denitrification reaction may proceed without guaranteeing the water quality, odor, and color of the treated water. This can lead to problems such as causing discomfort to users, especially in circulating water treatment systems. Therefore, knowing when the nitrification reaction is complete is an important element in water treatment technology, in order to maintain the quality of treated water. To allow treated water that has undergone sufficient nitrification to proceed to the denitrification reaction, a device is known that measures the nitrogen oxide concentration or ammonia concentration of the treated water in the nitrification tank and adjusts the aeration airflow rate in the tank so that the concentration falls within a predetermined range (see, for example, Patent Document 1). Japanese Patent Publication No. 2001-259689 Chapter 4 Introduction to Water Treatment, [online], [Retrieved October 20, 2024], Internet, <URL: https://dec.alaska.gov/media/11475/chapter-4-intro-to-water-treatment.pdf> Figure 1 is a graph showing the relationship between the amount of chlorine injected into water and the free chlorine concentration.Figure 2 shows the relationship between the amount of chlorine injected into ammonia nitrogen and the free chlorine concentration, the relationship between the amount of chlorine injected into nitrite nitrogen and the free chlorine concentration, and the relationship between the amount of chlorine injected into nitrate nitrogen and the free chlorine concentration.Figure 3 is a schematic diagram showing one embodiment of the nitrification reaction determination system.Figure 4 is a block diagram showing the functional configuration of the determination means 40.Figure 5 is a flowchart showing the process when the nitrification reaction determination system 1 performs the determination.Figure 6 is a flowchart showing the process when the nitrification reaction determination system 1 performs a determination process and the biological treatment tank 10 performs a control process.Figure 7 is a schematic diagram showing another embodiment of the nitrification reaction determination system.Figure 8 is a flowchart showing the process when the nitrification reaction determination system 1 performs the determination.Figure 9 is a schematic diagram showing another embodiment of the nitrification reaction determination system. The details of each aspect of the present invention will be described below, but the present invention can take various forms insofar as it achieves its objective. Unless otherwise specified, each term used herein has the meaning commonly used by those skilled in the art, such as in the field of water treatment, and should not be interpreted as having an unduly restrictive meaning. Furthermore, since the assumptions and theories presented herein are based on the inventors' prior knowledge and experience, the present invention is not limited solely to such assumptions and theories. "Comprise, contain, include" means that elements other than those explicitly included can be added (synonymous with "at least include"), but it also encompasses "consist of" and "essentially constitute of". In other words, "comprise" can mean that it includes the explicitly included elements and any one or more of those elements, that it consists of the explicitly included elements, or that it essentially constitutes the explicitly included elements. "Have" is synonymous with "comprise". Examples of elements include parts, means, components, processes, conditions, parameters, and other limitations. "And/or" means any one of the listed related items, any combination of two or more items, or any combination of all of them. [Summary of the present invention] The water quality determination system of the present invention comprises a chlorine supply means, a chlorine concentration measuring means, and a determination means as basic elements. The water quality determination system supplies chlorine to the object to be determined