CN-122017124-A - Water quality monitoring system and method

CN122017124ACN 122017124 ACN122017124 ACN 122017124ACN-122017124-A

Abstract

The invention provides a water quality detection system and a water quality detection method, wherein the system comprises a detection module, a control and data processing module and a control and data processing module, wherein the detection module comprises a detection electrode and an automatic titration unit, the detection electrode is configured to detect the concentration of free ammonia in a water sample to be detected and convert the concentration into a potential signal, the automatic titration unit is configured to titrate an alkaline solution into the water sample to be detected to convert fixed ammonia into free ammonia, the control and data processing module is electrically connected with the detection module and is configured to receive the potential signal, the start and stop of the automatic titration unit are controlled according to the received potential signal, and the total free ammonia content and the total ammonia content in ammonia evaporation wastewater are quantitatively calculated according to the potential signal and the dripping of the alkaline solution. The quality of water is monitored in real time, solves the problems of long detection period and poor aging of the existing ammonia distillation wastewater, reduces the manual operation error through automatic operation, and improves the detection precision.

Inventors

CHANG BO
LI YIKAI
DING HONG

Assignees

宝武水务科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (9)

1. A water quality monitoring system for monitoring the quality of ammonia still wastewater, comprising: The detection module comprises a detection electrode and an automatic titration unit, wherein the detection electrode is configured to detect the concentration of free ammonia in a water sample to be detected and convert the concentration into a potential signal, and the automatic titration unit is configured to titrate an alkaline solution into the water sample to be detected so as to convert the fixed ammonia into the free ammonia; The control and data processing module is electrically connected with the detection module and is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total content of free ammonia and the total ammonia content in the ammonia distillation wastewater according to the potential signal and the dropping quantity of the alkaline solution, wherein the total ammonia content comprises the total content of fixed ammonia and free ammonia.
2. The water quality monitoring system of claim 1, wherein the control and data processing module is further configured to control the automatic titration unit to start titration after recording an initial potential of the detection electrode, and to perform a first or second derivative of the potential signal, and to determine a titration endpoint to stop titration based on a peak point of the first derivative or a mutation point of the second derivative.
3. The water quality monitoring system of claim 1, wherein the automatic titration unit is further configured to rapidly add liquid at an initial stage of titration, and to reduce a titration rate near the titration endpoint to avoid overdropping.
4. The water quality monitoring system of claim 1, further comprising: The pretreatment module comprises a pre-filtering unit and a sampling unit, wherein the pre-filtering unit is configured to filter the ammonia evaporation wastewater to remove unexpected impurities, the unexpected impurities comprise greasy dirt and solid particles, and the sampling unit is configured to sample the filtered ammonia evaporation wastewater to obtain the water sample to be tested.
5. The water quality monitoring system of claim 1, wherein the detection electrode comprises: And the ammonia gas sensitive electrode is configured to detect the concentration of free ammonia in the water sample to be detected.
6. The water quality monitoring system of claim 1, wherein the detection electrode further comprises: A cyanide ion-selective electrode configured to detect the concentration of cyanide ions in the water sample to be measured; And the pH electrode is configured as a reference electrode and is used for measuring the pH value in the water sample to be measured.
7. The water quality monitoring system of claim 6, wherein the automatic titration unit is further configured to titrate a potassium iodide standard solution into the water sample to be tested, and the control and data processing module is further configured to calculate the total cyanide content of the ammonia distillation wastewater based on the titration amount of the potassium iodide standard solution.
8. The water quality monitoring system of claim 1, wherein the control and data processing module is configured to obtain the concentration of free ammonia in the water sample to be measured according to the initial potential of the detection electrode, and calculate the total content of free ammonia in the ammonia distillation wastewater therefrom, and calculate the total ammonia content in the water sample to be measured according to the initial potential of the detection electrode and the titration of the alkaline solution, and calculate the total ammonia content in the ammonia distillation wastewater therefrom.
9. A water quality monitoring method employing the water quality monitoring system according to any one of claims 1 to 8, comprising: filtering the ammonia distillation wastewater, and sampling the filtered ammonia distillation wastewater to obtain a water sample to be detected; detecting the concentration of free ammonia in the water sample to be detected, and titrating an alkaline solution into the water sample to be detected; And calculating the total content of free ammonia and the total ammonia content in the ammonia distillation wastewater according to the concentration of the free ammonia in the water sample to be detected and the titration amount of the alkaline solution.

Description

Water quality monitoring system and method Technical Field The invention relates to the technical field of water treatment, in particular to a water quality monitoring system and a water quality monitoring method. Background The residual ammonia water generated by coking ammonia distillation is industrial wastewater with complex components, high toxicity and difficult degradation, is generated in the coking production process and is about 15 percent of the coal charge amount, mainly comprises free ammonia and fixed ammonium, contains a small amount of ammonia nitrogen substances such as sulfide, ammonia, cyanogen and the like, has the ammonia nitrogen concentration of 3-4.5 g/L, and cannot be directly biochemically treated. According to the requirement of environmental protection, the residual ammonia water must be treated to be discharged. The ammonia distillation is to distill the residual ammonia water, reduce the NH 3 -N content in the residual ammonia water, prepare the necessary earlier stage for the next biochemical treatment, and the recovered ammonia water is used for producing ammonium sulfate. At present, most domestic metallurgical enterprises adopt a process of directly evaporating ammonia by water vapor, and the process is mature, low in investment and high in safety and reliability, and has the defect of high vapor consumption, and the vapor quantity required for treating each cubic residual ammonia water is 130-140 m 3 generally. At present, the steam consumption and the medicament consumption are mainly optimized and regulated according to the detection results of a plurality of key indexes of the ammonia distillation wastewater by laboratory manual work, but the detection aging in the laboratory has certain hysteresis and is generally longer than 24 hours, so that the aging of water quality parameters according to the steam consumption and the medicament consumption during regulation is delayed, and the optimized and regulated effects are poor or even invalid. In order to alleviate the above problems, it is needed to develop a new water quality monitoring system and method to shorten the detection period, improve the detection timeliness, and adjust the steam usage and the medicament usage in time, so as to reduce the production cost, save energy and reduce emission. Disclosure of Invention The invention aims to provide a water quality monitoring system and a water quality monitoring method, which are used for solving the problems of long detection period and poor aging of the existing ammonia distillation wastewater. In order to solve the technical problems, the invention provides a water quality monitoring system for monitoring the water quality of ammonia distillation wastewater, comprising: The detection module comprises a detection electrode and an automatic titration unit, wherein the detection electrode is configured to detect the concentration of free ammonia in a water sample to be detected and convert the concentration into a potential signal, and the automatic titration unit is configured to titrate an alkaline solution into the water sample to be detected so as to convert the fixed ammonia into the free ammonia; The control and data processing module is electrically connected with the detection module and is configured to receive the potential signal, control the start and stop of the automatic titration unit according to the received potential signal, and calculate the total content of free ammonia and the total ammonia content in the ammonia distillation wastewater according to the potential signal and the dropping quantity of the alkaline solution, wherein the total ammonia content comprises the total content of fixed ammonia and free ammonia. Optionally, the control and data processing module is further configured to control the automatic titration unit to start titration after recording the initial potential of the detection electrode, perform first-order or second-order derivative on the potential signal, and judge a titration endpoint according to a peak point of the first-order derivative or a mutation point of the second-order derivative so as to stop titration. Optionally, the automatic titration unit is further configured to rapidly add liquid at the initial stage of titration, and to reduce the titration speed near the end point of titration to avoid overdropping. Optionally, the water quality monitoring system further comprises: The pretreatment module comprises a pre-filtering unit and a sampling unit, wherein the pre-filtering unit is configured to filter the ammonia evaporation wastewater to remove unexpected impurities, the unexpected impurities comprise greasy dirt and solid particles, and the sampling unit is configured to sample the filtered ammonia evaporation wastewater to obtain the water sample to be tested. Optionally, the detection electrode includes: And the ammonia gas sensitive electrode is configured to detect the concentration of free ammonia in t