COVID-19 Pneumonia Epidemic/hospital/sewage Treatment Plant Water Quality Monitoring Program

- Jul 10, 2020-

The Ministry of Ecology and Environment of China issued the “Notice on Doing a Good Job in the Supervision of Medical Sewage and Urban Sewage of COVID-19 Infected Pneumonia” and “COVID-19 Contaminated Medical Wastewater Emergency Treatment Technical Plan (Trial)”, which requires strict monitoring measures and regulations The requirements for emergency treatment and sterilization of medical sewage ensure the safe discharge of treated tail water. The notice specifically pointed out that in addition to the monitoring of 61 conventional indicators, the monitoring of two epidemic prevention and control characteristics indicators of residual chlorine and biological toxicity was added.

Hospital sewage disinfection often uses chlorine disinfectants (such as sodium hypochlorite, bleach, bleach, liquid chlorine, etc.), peroxide disinfectants (such as peracetic acid, etc.), ozone disinfection and other measures.

When disinfecting with chlorine-containing disinfectants and discharging hospital sewage to surface water bodies, dechlorination measures must be taken. When using ozone disinfection, an exhaust gas treatment device must be provided at the end of the process, and the ozone exhaust gas discharged after the reaction must be decomposed and destroyed to meet the emission standard.


Monitoring scheme 1: residual chlorine detection test paper 0-10mg/L 100 times/box.

Product features: For the most common residual chlorine detection, it is the best choice, economical, ready to use, without any professional knowledge. (1) Simple operation-very simple operation steps, no other auxiliary consumables are required (2) Accurate and reliable-classic colorimetric analysis, multi-level test requirements, visual reading with colorimetric card (3) Convenient and fast-test samples It only takes 0-1 minutes, and it is convenient for outdoor testing and carrying (4) Stable and reliable-it is packaged in a dry and sealed barrel, and the shelf life is up to 18 months.

Operation process: 1. Throw off excess liquid on the test paper;

2. Compare the color with the color block on the packaging drum of the residual chlorine test paper;

3. The corresponding color is the residual chlorine concentration of the liquid.

residual chlorine

Monitoring program 2: Residual chlorine analyzer LH-M900. Detection range: 0-10mg/L

Main features: (1) Professional optical design, no moving parts inside, and high accuracy. (2) The amount of samples and reagents is small, and the analysis speed is fast. The standard 10ml colorimetric bottle is used. (3) Multi-parameter detection, can detect more than 10 items. (4) Built-in storage space, the instrument can save 5000 test results, the test results are manually saved. (5) Acrylic protection panel, 5 buttons, long service life. (6) Waterproof interface design, common with Android mobile phone data cable, can be connected to a computer.

Detection method: using DPD photometric method, the residual chlorine reacts with the DPD reagent and is red.

Operation process: (1) Take a clean colorimetric bottle, add 10m L of water sample to be tested, and put it into the instrument for zero adjustment. (2.) Take out the zero colorimetric bottle, add 1 package of residual chlorine reagent, shake evenly, within 1 minute of reaction, just put in the instrument to read. (3.) The value in the middle of the screen is the residual chlorine content in the water sample.

chlorine test meter

Monitoring scheme 3: Online residual chlorine monitor LH-CL650 Detection range: residual chlorine 0-20mg/L, hypochlorous acid 0-10mg/L

Main features: (1) Simultaneous display of multiple parameters: residual chlorine value, hypochlorous acid value, PH value, temperature, output current, etc. are displayed at the same time, intuitive and easy to read, and there is a reminder of overrange. (2) With RS-485 communication interface (partially compatible with MODBUS protocol), the residual chlorine value corresponding to 4-20 mA current output can be set arbitrarily. (3) The function of arbitrarily setting the amount of hysteresis to avoid the frequent operation of the switching relay, and has the function of setting the switch off and off. (4) Watchdog function: ensure that the instrument will not crash. (4) The core devices are all from well-known foreign brands, and the power-off protection is> 10 years.

residual chlorine monitor