1、 Industry Overview

China started relatively late in the sewage treatment industry. Before the reform and opening up, the demand was mainly for industry and national defense, and it only entered a period of vigorous development in the later stage. Based on the large total water demand of the population, the sustainable development of the water industry and sewage treatment industry has been promoted. According to the "2022-2027 China Sewage Treatment Industry Market Panorama Research and Investment Value Evaluation Report", sewage treatment is an environmental issue that the government continues to pay attention to. In 2017, the Ministry of Finance, the Ministry of Housing and Urban Rural Development, the Ministry of Agriculture, and the Ministry of Environmental Protection jointly issued a notice on the comprehensive implementation of PPP mode in government participation in sewage and garbage treatment projects. It is pointed out that in order to promote the healthy development of the sewage and garbage treatment industry, market mechanisms should be fully introduced in the field of sewage and garbage treatment, and PPP models should be fully implemented for newly added sewage and garbage treatment projects involving government participation.

A sewage treatment plant refers to a place where the total amount or concentration of pollutants is high, which cannot meet the discharge standards or does not meet the environmental capacity requirements, thereby reducing the water environment quality and functional goals. It is necessary to manually treat the sewage (wastewater) discharged from the pollution source. A sewage treatment plant is a complex system composed of multiple unit processes. The cost and efficiency of each unit process are interrelated and influence each other, ultimately determining the cost and benefits of the entire system.

2、 Industry pain points

The role of sewage treatment technology is only to purify sewage through biodegradation and solid-liquid separation, while enriching pollutants into sludge, including the primary sedimentation sludge generated in the first stage treatment section, the residual activated sludge generated in the second stage treatment section, and the chemical sludge generated in the third stage treatment section. Due to the high content of organic matter and pathogens in these sludge, as well as their susceptibility to decay and odor, they are prone to causing secondary pollution, and the task of eliminating pollution has not yet been completed.

Common gases generated in sewage treatment plants include ammonia, hydrogen sulfide, methane, chlorine gas, chlorine dioxide, carbon dioxide, etc. Among them, methane and hydrogen sulfide are toxic gases produced by sludge precipitation and other processes; Chlorine gas, chlorine dioxide and other gases are toxic gases produced by disinfection in sewage treatment plants.

Therefore, according to the toxic and harmful gases involved in the sewage treatment plant, it is necessary to use detection instruments to monitor the target gases, prevent explosions and poisoning, and ensure personal safety.

3、 Solution

1. Overview of the plan

We have developed the following solutions to address the pain points in the wastewater treatment plant industry.

Monitoring location: Locations that are prone to leakage during process treatment: grid room, inlet pump room, gas sedimentation room, sand washing room, mud collection well, concentration tank, dewatering room, drying room, and pipe gallery. Gas detector installation should be considered. Using a portable gas alarm in a relatively enclosed environment

Gas to be monitored: toxic and harmful gases such as ammonia, hydrogen sulfide, methane, chlorine, carbon monoxide, etc

Environmental equipment monitoring system: Various sensors such as combustible gas and toxic gas detection alarms are placed in the sewage treatment plant to monitor the real-time status of various gases and environmental parameters during the sewage treatment process.

Data transmission: The gas detection detector transmits a 4-20mA current signal or RS485 bus based digital signal to the gas alarm controller, and then converts the signal to be transmitted to the computer terminal;

2. Recommended equipment

For four gases including ammonia, hydrogen sulfide, carbon monoxide, and oxygen, it is recommended to use electrochemical sensors - ammonia sensor, hydrogen sulfide sensor, carbon monoxide sensor, and oxygen sensor.

For monitoring combustible gases such as methane, it is recommended to use catalytic combustion or infrared sensors to monitor the overall concentration of combustible gases.

In general, it is recommended to use AG series gas detectors for monitoring; If the installation location is difficult or the site is limited, the AGH6200 handheld four in one gas detector can be used for monitoring. One detector can simultaneously monitor four gases, making it convenient to carry.