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Groundwater Quality Monitoring Solutions

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Groundwater is one of the important water resources, and the amount of groundwater resources in China is 8.1957×1011 m3,the water supply of groundwater sources is 8.538×1010m3,accounting for the total water supply14.5%.According to the monitoring data of the 2021 China Ecological Environment Status Bulletin and the 14th Five-Year Plan National Groundwater Environmental Quality Assessment Point, groundwater Class V water (GB/T 14848-2017 ) Groundwater Quality Standard accounts for 20.6%. Groundwater pollution is hidden and persistent, and pollutants can affect the safety of human settlements and drinking water without being easily detected. Through groundwater monitoring, we can understand the water level, water quality and quantity of groundwater in a timely manner, provide a basis for water resource managers to make decisions, ensure sustainable utilization, detect groundwater pollution in a timely manner, and take necessary measures to prevent groundwater pollution.

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Product Description

Background

Groundwater is one of the important water resources, and the amount of groundwater resources in China is 8.1957×1011 m^3,the water supply of groundwater sources is 8.538×1010m³,accounting for the total water supply14.5%.According to the monitoring data of the 2021 China Ecological Environment Status Bulletin and the 14th Five-Year Plan National Groundwater Environmental Quality Assessment Point, groundwater Class V water (GB/T 14848-2017 ) Groundwater Quality Standard accounts for 20.6%. Groundwater pollution is hidden and persistent, and pollutants can affect the safety of human settlements and drinking water without being easily detected. Through groundwater monitoring, we can understand the water level, water quality and quantity of groundwater in a timely manner, provide a basis for water resource managers to make decisions, ensure sustainable utilization, detect groundwater pollution in a timely manner, and take necessary measures to prevent groundwater pollution.

Policy Analysis

The Implementation Plan for Groundwater Pollution Prevention and Control emphasizes the establishment of a national groundwater environment monitoring system, proposing to improve the groundwater environment monitoring network, integrate existing groundwater environment monitoring wells, strengthen operation, maintenance and management, and improve the groundwater monitoring data reporting system. By the end of 2025, build a national groundwater environment monitoring network;
The Outline of the Ecological Environment Monitoring Plan (2020-2035) proposes to build a national groundwater environment monitoring system that combines quality supervision in key areas and monitoring of "dual sources" (groundwater drinking water sources and key groundwater pollution sources);
The Regulations on Groundwater Management require strengthening the control of groundwater pollution and the construction of groundwater quality monitoring wells. The Ministry of Ecology and Environment and other seven ministries and commissions jointly issued the "14th Five-Year Plan for the Protection of Soil, Groundwater and Rural Ecological Environment", which clearly establishes a groundwater pollution prevention and control management system and improves the ability to supervise the ecological environment.

Groundwater Monitoring Difficulties

The online monitoring equipment for water quality is immature, and the proportion of online monitoring points is low;
The online monitoring indicators are mainly physical indicators, and the types and quantities of pollutants monitored are limited, making it difficult to solve the problem of multi-source pollution;
The construction of groundwater environmental supervision platform is weak, and data sharing and application services are not in place.

Solution

In response to the needs of groundwater monitoring in different occasions, has customized two solutions.
Water quality monitoring station extractive water quality monitoring method: The scheme consists of three parts: water quality monitoring unit, information transmission and network communication unit, and user management platform measured by colorimetric method + electrode method, which can provide accurate and reliable data support for managers.

Input monitoring method: This scheme avoids high station building construction costs and can be powered by solar energy or batteries for remote sites. The online monitoring system is composed of three core parts: monitoring and perception terminal, data transmission terminal and intelligent management platform, and real-time monitoring of groundwater level, water quality and other key parameters through the water level gauge and water quality sensor equipment at the sensing end. Through wireless communication technology, the data transmission and remote control between the groundwater monitoring system and the central monitoring platform are realized, and real-time data analysis is carried out through the platform to generate monitoring reports and early warning information, providing reliable basis and data support for managers to make decisions.

Solution Advantages

The extractive type uses a more accurate colorimetric method to determine COD, ammonia nitrogen and other indicators in water, and can meet the needs of various groundwater monitoring with various water quality sensors, and can provide managers with accurate and reliable water quality monitoring data;
The sensor of the input monitoring adopts an integrated design, covering a variety of monitoring indicators (water level, temperature, PH, conductance, ORP, DO, turbidity, nitrate, ammonia nitrogen, chloride, fluoride, potassium ions, etc.), and the water quality parameters are highly expandable, and the monitoring indicators can be flexibly configured according to different water quality monitoring requirements on site;

Real-time monitoring includes single-point monitoring, multi-point monitoring, site distribution, etc., which can understand the water quality level, water quality data, collection time, site map and site distribution of each monitoring station in real time, and can query video surveillance/periodic data, alarm data, data reports, etc.;
Real-time groundwater quality information can be obtained through Internet of Things technology, which can detect abnormal water quality in time, issue early warning signals immediately, and build a safety defense line for groundwater quality.

Product Features

Characteristics of colorimetric water quality monitor

The syringe pump is used for precise quantification, and the water sample and reagent injection are more stable and accurate, ensuring the measurement accuracy;
It has the function of separating waste liquid, which realizes the separate discharge of high-concentration reaction waste liquid and low-concentration cleaning waste liquid;

It has an automatic dilution function, which can automatically adjust the range according to the actual water quality on site;
It has built-in quality control functions such as spike recovery, blank test, standard sample verification, zero point verification, span verification, parallel sample testing, etc., and can realize automatic, manual, remote and other ways to start quality control functions.

PUVNO3-900 Product Features

Adopting the principle of ultraviolet light absorption, imported xenon lamp source, built-in NO₂-compensation, the measurement results are stable and reliable;
Probe direct immersion measurement without sampling and pre-treatment;
No chemical reagents required, no secondary pollution;

Short response time for continuous measurement;
The sensor has an automatic cleaning function to reduce maintenance.

MP301 Product Features

MP301 is suitable for long-term field online monitoring, can measure up to 8 parameters at the same time, and can fully meet the needs of groundwater monitoring;
The sampling interval can be flexibly set to optimize the work/sleep time and reduce the overall power consumption, and it can be powered by battery, solar and mains;
It has a self-cleaning system, which can ensure data accuracy and reduce maintenance in long-term monitoring;

It has a large-capacity data storage function, and the amount of data stored is 100,000;
Support on-site electrode replacement, simple and fast maintenance;
It has reverse power supply protection and RS485 A/B misconnection power protection.

MP301 Host Parameters

Power supply	9-36VDC	Operating temperature	0-40°C (non-freezing).
Power consumption	3W	Storage temperature	0-50°C (non-freezing).
Communication	MODBUS RS485	Protection level	IP68
Size :	90mm635mm (diameterlength).	Weight	5KG
Maximum pressure depth	30 meters (with ion electrodes: 10 meters).	Battery capacity	8 cells, 3.6V lithium sub-battery

Standard Parameter Electrode Index

Depth	Principle	Pressure sensitive method
	Range	0-61m (maximum withstand pressure depth of the whole machine: 30m).
	Resolution	2cm
	Accuracy	±0.3%
Temperature	Principle	Thermistor method
	Range	0-60°C (the working temperature of the whole machine is 0-40°C).
	Resolution	0.1℃
	Accuracy	±0.5℃
pH	Principle	Glass electrode method
	Range	0-14 pH(pH range of 5-10pH when there are ionic electrodes)
	Resolution	0.01 pH
	Accuracy	±0.1 pH
ORP	Principle	Glass electrode method
	Range	-1000mV-1000mV
	Resolution	1mV
	Accuracy	±5mV
Conductivity	Principle	Conductive cell method
	Range	1us/cm-2000 us/cm（K=1）；100us/cm-100ms/cm（K=10.0） 100us/cm-100ms/cm（K=10.0）
	Resolution	0.1us/cm-0.01ms/cm(depending on the range)
	Accuracy	±3%
Turbidity	Principle	Light scattering
	Range	0-1000NTU
	Resolution	0.1NTU
	Accuracy	± 5% or 0.3 NTU whichever is larger
Dissolved oxygen	Principle	Fluorescence method
	Range	0-20 mg/L；0-20 ppm；0-200% saturation
	Resolution	0.1%/0.01mg/L
	Accuracy	±3% of the measured value or ± 0.3mg/L, whichever is greater ± 0.2mg/L＞8mg/l
Chlorophyll	Principle	Fluorescence method
	Range	0-500ug/L
	Resolution	0.01 ug/L-0.1 ug/L(depending on the range)
	Accuracy	The signal level of 1ppb rhodamine B dye corresponds to ± 5% of the corresponding value
Blue-green algae	Principle	Fluorescence method
	Range	0-300,000cells/mL
	Resolution	20 cells/mL
	Accuracy	The signal level of 1ppb rhodamine B dye corresponds to ±10% of the corresponding value
Ammonia nitrogen	Principle	Ion selection electrode method
	Range	0.1-3000mg/L-N
	Resolution	0.01mg/L-N
	Accuracy	±5% or ± 0.2mg/L
Nitrogen	Principle	Ion selection electrode method
	Range	0.5-3000mg/L-N
	Resolution	0.01mg/L-N
	Accuracy	±10% or ±0.2mg/L
Chloride	Principle	Ion selection electrode method
	Range	3-3500mg/L
	Resolution	0.01mg/L
	Accuracy	±10% or ±0.2mg/L
Fluoride	Principle	Ion selection electrode method
	Range	0.5-10000mg/L
	Resolution	0.01mg/L
	Accuracy	±10% or ±0.2mg/L
Potassium ions	Principle	Ion selection electrode method
	Range	0.5-5000 mg/L
	Resolution	0.01mg/L
	Accuracy	±10% or ±0.2mg/L

Case sharing

"Groundwater exploitation and pressure project in Shandong Province" For a long time, local surface water has been over-exploited and groundwater has been seriously over-exploited. For sustainable development, a groundwater monitoring system has been built to monitor the groundwater level in the over-exploited area.

"Urumqi City Groundwater Pollution Monitoring Network Construction Project" Urumqi City Groundwater Pollution Monitoring Network Construction Demonstration Project Phase I and Phase II, completed the construction of 149 new monitoring holes and repaired 25 observation holes. Promote the investigation and evaluation of groundwater quality in Urumqi City, early warning and prediction, groundwater pollution monitoring network construction and groundwater supervision capacity building.

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Groundwater Quality Monitoring Solutions

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