Total phosphorus analyzerDomestic sewage is the wastewater generated in our daily lives. The main components of domestic sewage are organic matter and some pathogenic microorganisms. Due to the instability of organic matter in domestic sewage, it is easy to emit odors. Due to the high incidence of pathogens in sewage testing, direct discharge can easily lead to the development of infectious diseases and viruses, posing a threat to human health. Therefore, domestic sewage must be tested before being discharged. What are the inspection items for domestic sewage?

1. Ammonia nitrogen

Nitrogen exists in water in the form of free ammonia (NH3) and ammonium ions (Nh4). The nitrogen content of animal organic matter is generally higher than that of plant organic matter. Meanwhile, nitrogen-containing organic compounds in human and animal feces are highly unstable and easily decompose into ammonia. Therefore, when the ammonia nitrogen content in water increases, it refers to the synthesis of ammonia in the form of ammonia or ammonium ions. Ammonia nitrogen mainly comes from human and animal excrement. The per capita nitrogen content in domestic sewage is 2.5-4.5kg per year.

2. Coliform microbiota

A group of bacteria with certain characteristics related to fecal pollution, which are inconsistent in biochemistry and serology They are defined as aerobic and facultative anaerobic bacteria that can break down lactose and produce acid at 37 ° C. They are Gram negative Gram negative bacteria.

3. Phosphates:

Phosphates are one of the natural components of almost all foods and are widely used as important food ingredients and functional additives in food processing. In the case of pollution, phosphate is the main component of total dissolved solids (a major indicator of water quality).

4. Biochemical Oxygen Demand

Aerobic microorganisms in water decompose organic matter into inorganic matter at a certain temperature. The dissolved oxygen required during the oxidation process at a specific time is a comprehensive index indicating the content of aerobic pollutants such as organic matter in water.

5. Suspended solids

Suspended solids in water, including insoluble inorganic, organic, and sludge, clay, and other microorganisms. The solid content suspended in water is a measure of the degree of water pollution.

6. Chemical Oxygen Demand

High chemical oxygen demand means that water contains a large amount of reducing substances, mainly organic pollutants. The higher the chemical oxygen demand, the more severe the pollution of organic matter in rivers.

7. PH value

The pH scale is the activity of hydrogen ions in a solution, which measures the pH level of the solution in the usual sense.

8. Total phosphorus

After the water sample is digested into ordinary phosphate, the results of measuring different forms of phosphorus based on the amount of phosphorus per liter of water sample.

9. Total number of bacteria

Cultivate the total number of bacterial colonies in ml of water for 24 hours in nutrient agar medium at 37 degrees Celsius.

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