Domestic sewage refers to water discharged from the daily lives of residents, mainly originating from residential and public buildings such as schools, hospitals, and public toilets. The pollutants contained in domestic sewage are primarily organic matter and a large number of pathogenic microorganisms. So, what hazards do these bring? As a manufacturer of water quality online monitoring instruments, we will explore the hazards brought by domestic sewage with you!

1. Hazards of Pathogenic Pollution in Sewage

This sewage mainly comes from urban domestic sewage, hospital sewage, garbage, and ground runoff. The characteristics of pathogenic microorganisms include: 1. Large quantity; 2. Wide distribution; 3. Long survival time; 4. Fast reproduction rate; 5. Resistance prone to occur and difficult to eliminate; 6. Several pathogenic microorganisms and viruses can still survive in large numbers after traditional secondary biological sewage treatment and chlorination. These pollutants actually enter the human body through multiple pathways, survive within the body, and cause diseases!

2. Hazards of Oxygen-Demanding Organic Matter Pollution in Sewage

A common characteristic of organic matter is that after entering the water body, these substances are decomposed into simple inorganic substances like carbon dioxide and water through the biochemical action of microorganisms. This decomposition process consumes dissolved oxygen in the water. Under anaerobic conditions, pollutants will undergo putrefactive decomposition, deteriorating water quality. These organic substances are often called aerobic organic matter. This means the more aerobic organic matter in the water, the higher the oxygen consumption, leading to worse water quality and more serious pollution.

3. Hazards of Eutrophication Pollution in Sewage

Eutrophication is a water pollution phenomenon caused by excessive plant nutrients such as nitrogen and phosphorus. Eutrophication in aquatic ecosystems can occur via two pathways from chemical pollutants: one is an increase in inorganic nutrients that normally limit plant growth; the other is an increase in organic matter for decomposers. To ensure safe drinking water resources, water quality monitoring instruments are indispensable to judge the specific conditions of water quality through data!

YexSensor Domestic Sewage Monitoring Core Integration Components

For decentralized and centralized sewage treatment facilities, YexSensor provides the following standardized digital sensors, supporting standard industrial protocols for seamless connection with PLCs and cloud systems.

Recommendations for Domestic Sewage Treatment Facilities

The discharge of domestic sewage seriously affects the water environment! Because of this, relevant departments attach great importance to it. To ensure effective results, we suggest the following points:

• Standardize Sewage Treatment Processes: Treatment must be under environmental policies, from construction to equipment installation and maintenance. Standardize workflows and operations to ensure long-term effective operation.

• Choose Scientific Treatment Models Localized to Conditions: Every location's environment and economy are different. Conduct field inspections and scientifically propose solutions that fit the actual situation to ensure results.

• Publicity and Guidance Work: Public participation is required. Use various channels of publicity to let everyone recognize the importance and participate actively.

• Importance of Daily Operation and Maintenance: Facilities must be well-managed. Select high-quality third-party O&M units and form a multi-party linkage long-term O&M model to ensure normal operation.

• Utilize Networks to Boost Treatment Work: Use new technology to install water quality monitors on facilities. Real-time monitoring of pollutants and data transmission to computer systems allow staff to check data anytime and take appropriate measures.

FAQ: Frequently Asked Questions in Domestic Sewage Online Monitoring Integration

Q1: In domestic sewage monitoring, why is optical DO superior to traditional membrane DO?
Optical DO doesn't consume oxygen, has no minimum flow rate limit, and isn't affected by hydrogen sulfide poisoning. For high-bioactivity environments like domestic sewage tanks, it can achieve 6-12 months of maintenance-free operation.

Q2: What are the special requirements for hospital sewage monitoring?
Hospital sewage must focus on Residual Chlorine or ORP to ensure complete disinfection. Simultaneously, online COD monitoring is key to assessing whether the biological system is under shock due to organic fluctuations.

Q3: How to achieve "energy saving and consumption reduction" using monitoring data?
By monitoring the DO value of the aeration tank in real-time to link with frequency converters controlling fans. Maintaining DO at the optimal point (usually 2mg/L) can save 15%-30% energy compared to constant aeration.

Q4: Why is it recommended to use digital ISE ammonia sensors in domestic sewage treatment?
ISE probes require no sampling system or expensive reagents, have a second-level response speed, and can be directly used in biological tanks, making them suitable for cost control in small decentralized stations.

Q5: How to prevent sensor cable damage in sewage during system integration?
Corrosion-resistant shielded cables should be used, paired with professional diving brackets or buoy systems to avoid the cable bearing direct tension or long-term friction in dead corners.

Q6: What are the difficulties in monitoring total phosphorus and total nitrogen for eutrophication control?
Traditional analyzers are large and require reagents. In integration schemes without monitoring rooms, COD and Ammonia can be used as real-time reference indicators with regular laboratory comparisons.

Q7: Can digital sensors connect directly to 4G/5G terminals?
Yes. YexSensor's RS485 signals can directly enter DTUs supporting Modbus protocols to interface directly with IoT cloud platforms.

Q8: How to ensure monitoring continuity if the sewage station frequently loses power?
Integrators should configure control boxes with UPS or choose YexSensor low-power sensor series, which can support long-term online operation using solar energy combined with high-capacity lithium batteries.

Summary: Intelligence Supporting Long-term Domestic Sewage Governance

Domestic sewage governance is a systematic project. From standardized processes to localized models, every link relies on precise data. By integrating **YexSensor** digital water quality monitoring solutions, system integrators can deliver not just a compliant project, but a "visible, manageable, and optimizable" digital asset. Digital perception not only eliminates hidden dangers but promotes the sustainable utilization of resources through technology.

Get Integration Documents:
   For Modbus register tables or 3D interface models of relevant sensors, please visit the YexSensor official website: [www.yexsensor.com](https://www.yexsensor.com).