Water quality biological indicators and radioactive indicators

1.
Biological indicators

(1) Coliform coliform is the general term for the number of coliform bacteria or the nature of the coliform bacteria
.

Bacteriologically defined as the Gram-negative, non-spore-free bacilli that usually inhabit the cecum tubes of humans and animals, which can decompose lactose to produce acid and gas

①The quantity is large and easy to detect
.

② Coliform bacteria are more viable than general pathogenic bacteria
.

③The test is simple and results are obtained quickly
.

④ Coliform can be used as an indicator of fecal pollution
.

The value of coliform bacteria can indicate the degree of contamination of the water sample by feces, and indirectly indicate the possibility of the presence of intestinal bacteria.

(2) Total number of bacteria The total number of bacteria refers to the number of colonies on a flat culture medium, which is often used as a criterion for water quality determination.
The more bacteria total, the more serious the pollution
.

The total number of bacteria in the water reflects the degree of organic pollution in the water body and the degree of bacterial contamination

(3) More than 100 viruses have been detected in the virus wastewater
.

At present, the main inspection methods are quantitative measurement and plaque measurement

(4) If the water contains too many nutrients for eutrophic organisms, it will cause algae, shore plants and aquatic plants to reproduce and form eutrophication, which indirectly affects the reproduction of animal plankton, fish and benthic organisms, due to the degree of nutrition of the water.
Different, the type and quantity of each creature are also different
.

Therefore, the degree of nutrition and pollution of water can be judged by this characteristic

(5) Free residual chlorine tap water must be disinfected, so there is an appropriate amount of residual chlorine in the water to maintain continuous sterilization ability to prevent external re-contamination
.

The standard stipulates that the free residual chlorine in the factory water shall not be less than 0.

2.
Radioactivity indicators

The World Health Organization’s Drinking Water Quality Guidelines stipulate that the total y radioactivity of radioactive substances in drinking water is 0.
1Bq/L, and the total beta activity is 1.
0Bq/L
.

This is based on the assumption that the radioactive substances ingested when each person consumes 2L of water per day estimate the dose to adults in one year based on the biological metabolic parameters of adults