Water quality monitoring is defined here as the sampling and analysis of water constituents and conditions. These may include: Introduced pollutants, such as pesticides, metals, and oil Constituents found naturally in water that can nevertheless be affected by human sources, such as dissolved oxygen, bacteria, and nutrients.
The Definition of Water Quality Monitoring
The magnitude of their effects can be influenced by properties such as pH and temperature. For example, temperature influences the quantity of dissolved oxygen that water is able to contain, and pH affects the toxicity of ammonia.
Volunteers, as well as state and local water quality professionals, have been monitoring water quality conditions for many years. In fact, until the past decade or so (when biological monitoring protocols were developed and began to take hold), water quality monitoring was generally considered the primary way of identifying water pollution problems. Today, professional water quality specialists and volunteer program coordinators alike are moving toward approaches that combine chemical, physical, and biological monitoring methods to achieve the best picture of water quality conditions.
Water quality monitoring can be used for many purposes:
- To identify whether waters are meeting designated uses. All states have established specific criteria (limits on pollutants) identifying what concentrations of chemical pollutants are allowable in their waters. When chemical pollutants exceed maximum or minimum allowable concentrations, waters might no longer be able to support the beneficial uses such as fishing, swimming, and drinking for which they have been designated. Designated uses and the specific criteria that protect them (along with antidegradation statements that say waters should not be allowed to deteriorate below existing or anticipated uses) together form water quality standards. State water quality professionals assess water quality by comparing the concentrations of chemical pollutants found in streams to the criteria in the state’s standards, and so judge whether streams are meeting their designated uses. Water quality monitoring, however, might be inadequate for determining whether aquatic life uses are being met in a stream. While some constituents (such as dissolved oxygen and temperature) are important to maintaining healthy fish and aquatic insect populations, other factors, such as the physical structure of the stream and the condition of the habitat, play an equal or greater role. Biological monitoring methods (see Chapter 4) are generally better suited to determining whether aquatic life is supported.
- To identify specific pollutants and sources of pollution. Water quality monitoring helps link sources of pollution to a stream quality problem because it identifies specific problem pollutants. Since certain activities tend to generate certain pollutants (e.g., bacteria and nutrients are more likely to come from an animal feedlot than an automotive repair shop), a tentative link might be made that would warrant further investigation or monitoring.
- To determine trends. Chemical constituents that are properly monitored (i.e., consistent time of day and on a regular basis, using consistent methods) can be analyzed for trends over time.
- To screen for impairment. Finding excessive levels of one or more chemical constituents can serve as an early warning “screen” of potential pollution problems.
The Product to Support Water Quality Monitoring
MS-300 Underground Pipe Network Water Quality Monitoring Micro-system
The MS-300 underground pipe network water quality monitoring micro-system is a portable underground hydrology and water quality monitoring and early warning platform. The system is an integration of chemical analysis instruments and various water quality sensors and an intelligent online monitoring system composed of modern data acquisition and processing technology, data communication technology, cloud computing technology, and lithium-ion battery technology.
Effective technical means for networked and online monitoring. Product advantages Compact structure design, small size, convenient layout Input type, in-situ real-time monitoring, flexible selection of installation points Ultra-low power consumption, long maintenance cycle, simple maintenance Detachable high-precision sensor, free combination of multiple parameters to meet diverse needs Using 5G communication, it can realize 2Km collaborative work in the unobstructed state, and the continuous upload is accurate and reliable. Cast aluminum one-piece waterproof housing, 5G fiberglass antenna, IP68 protection level.
Product Parameters
| Model | MS-300 |
| Lithium battery (Including power monitoring system) | Power: 60 Ah Voltage: 12.6V |
| Data transfer module | a4G wireless transmission Dual frequency 900/1800, baud rate 9600 |
| Data acquisition module | Input: DC 12V /1A Average power consumption: <3 W |
| Sealed case | 280mm*230mm*110mm whole body cast aluminum material, waterproof, dustproof, high temperature resistance, corrosion resistance. |
| Measurement interval | The factory default measurement interval is 1 h. The measurement interval can be changed, with a minimum interval of 5 minutes. |
| Control method | None |
| Data transfer cycle | The factory default period is 1 h |
| Conditions of Use | a) Ambient temperature: 5℃ ~ 65℃ b) Relative humidity: the relative humidity in the sealed shell cavity is not more than 90% c) Power supply: DC12 V, 60Ah battery power supply d) Atmospheric pressure: 86 ~ 106 KPa |
EGM-200 Water Supply Water Quality Monitoring Microsystem
The EGM-200 water supply water quality monitoring micro-system launched by the company can realize the simultaneous measurement of various water quality parameters, including residual chlorine, pH, ORP, conductivity, and turbidity. The touch screen collects and processes the data measured by each digital sensor through the RS-485 (Modbus/RTU protocol) bus, and displays and stores the data. There are multiple windows displayed on the touch screen, which can display the data measured by each sensor in real-time.
The EGM-200 water supply water quality monitoring micro-system has a wide range of applications and can be used in tap water plant and pipe network monitoring, peripheral water, box-type secondary water supply, municipal water supply, and self-built facility water supply monitoring, direct drinking water supply, and other fields. Product advantages Modular design, can monitor multiple parameters at the same time, freely combined according to needs Compact structure, high integration, convenient installation and maintenance Turbidity measurement adopts 90° scattering method, automatic light source compensation, and built-in bubble elimination system, and the measurement is accurate Self-cleaning, reagent-free design, suitable for unattended environments User-friendly interface, real-time viewing of various monitoring data, historical data, alarm information record query.
Product Parameters
| Product name | Model | Description | |||
| Water Supply Water Quality Monitoring Microsystem | EGM-200 | (1) Real-time online monitoring of temperature, residual chlorine, pH, conductivity and turbidity, etc. (2) The rated power consumption of the system is less than 10W; the power consumption of the sensor is 0.5W/piece. (3) Dimensions: 300mm×360mm×100mm. (4) Power supply: 12-24V. | |||
| Residual chlorine | pH | Conductivity | Turbidity | Temperature | |
| Measuring Range | 0～2.000mg/L | 0～14.00pH | 0～5000μS/cm | 0～20.00NTU | 0～65℃ |
| Resolution | 0.001mg/L | 0.01pH | 1μS/cm | 0.01NTU | 0.1℃ |
| Precision | ±5% Or ±0.05mg/L | ±0.1pH | ±1.5%F.S. | ±3% Or ±1.5NTU | ±0.3 |
| Power Consumption | 0.2W@12V | 0.2W@12V | 0.2W@12V | 0.2W@12V | |
MPC-800 Small Water Quality Monitoring and Control Station
MPC-800 small water quality monitoring and control station (hereinafter referred to as “shore station”) is an online automatic water quality monitoring system composed of modern sensor technology, automatic control technology, special data analysis software, and a communication network. Simultaneous measurement of multiple water quality parameters (dissolved oxygen, pH, conductivity, turbidity, ORP COD, etc.) can be achieved.
Product features: Mobile shell structure, less investment, high integration, small footprint, short construction cycle Using steel structure and anti-theft design, to achieve the true sense of unattended According to local conditions, sampling nearby ensures the real-time and representativeness of water samples to be measured.
Probe type installation, no chemical reagents, water samples without processing, real and reliable measurement data. The high degree of automation, with perfect self-cleaning, excessive alarm, network communication, and other functions, less maintenance Modular design, free combination of monitoring parameters, no need for secondary investment and construction, to achieve a real seamless connection.
MS-500 Micro Water Quality Monitoring Station
MS-500 is a portable multi-parameter micro-automatic water quality monitoring system. It is a monitoring system that puts all the instruments and equipment of the fixed water quality monitoring station in the box unit, which can be loaded into the pull rod box and moved to different areas according to the need. The MS-500 consists of a data box unit (including a system control unit, data acquisition, and communication unit), a monitoring unit (including a circulation pool, and IOT sensor), and a water collection and distribution unit.
The MS-500 can be easily moved. Product features: Mobile shell structure, less investment, high integration, small footprint, short construction cycle Using steel structure and anti-theft design, to achieve the true sense of unattended According to local conditions, sampling nearby ensures the real-time and representativeness of water samples to be measured. Probe type installation, no chemical reagents, water samples without processing, real and reliable measurement data. The high degree of automation, with perfect self-cleaning, excessive alarm, network communication, and other functions, less maintenance Modular design, free combination of monitoring parameters, and no need for secondary investment and construction, to achieve a real seamless connection.
MF-500 Water Quality Online Monitoring Buoy
MF-500 multi-parameter water quality monitoring buoy system can realize simultaneous the measurement of various water quality parameters, including dissolved oxygen, pH, ORP, conductivity turbidity, etc.
The DT-200 master computer collects and processes the measurement of data through the RS-485 (Modbus/RTU protocol) bus, and then sends it to the remote server by the wireless module so that the user can obtain the monitoring data in real time. The water quality monitoring system with buoys as the carrier is the integration of chemical analysis instruments and various water quality sensors, and combines modern data acquisition and processing technology, data communication technology, buoy design and manufacturing technology, and is the realization of environmental water quality monitoring automation, network effective technical means for online monitoring.
Product advantages Adopt high precision sensor. Low power consumption design, effectively prevent damage from power short circuit or external interference, and avoid system crash. Monitoring environment: According to local conditions, it can directly detect the water quality requirements of designated water depths, ensuring the real-time and representativeness of the water samples to be measured. Equipment installation: direct input installation, anchorage fixed. The installation of the buoy system does not require land occupation and reduces the cost of land occupation; all instruments are installed with detachable probes to reduce subsequent maintenance and repair costs.
Data monitoring: High-precision sensors can be used to monitor water dissolved oxygen, turbidity, pH value, conductivity, water temperature, etc. in real-time. The monitoring parameters can be freely combined and added, and the parameters can also be expanded later. Data transmission: The water quality online monitoring technology uploads the data collected by the monitoring point to the user terminal through GPRS (optional NB-IOT) in a very short period of time to ensure the timeliness and effectiveness of the data. Compared with traditional manual sampling monitoring, it not only simplifies cumbersome procedures but also saves monitoring time.
Monitoring and early warning: Through the system PC terminal or mobile APP client, the user can set the safety value range of the monitored parameters. Once the front-end sensor detects that a certain water quality parameter exceeds the safety value range, the system will send an alarm message to notify the user for timely processing. Make sure the water quality of the monitoring site is good. Data analysis: automatic collection without manual supervision. The system automatically generates data charts, and users can intuitively understand the changes in water quality. The collected data can be saved, and historical data can be viewed at any time.
Reference : archive.epa.gov
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