What microorganisms can make water black and smelly

The blackening and smelling of water is not the result of the action of microorganisms, but the joint action of a variety of microorganisms. In addition, it is also related to excessive organic matter content and eutrophication in water.

Generally speaking, a large amount of organic matter in the water is decomposed under the action of saprophytic bacteria, which can make the water body black as a whole, and many bacteria can produce gases, especially hydrogen sulfide and ammonia, which are these two gases that make water smelly.

It may be caused by excessive nutrients in the water body and the proliferation of heterotrophic microorganisms, resulting in hypoxia in the water body, microbial death, and corpse decay!

Most aerobic bacteria, which are associated with eutrophication of water bodies. Algae plants grow in abundance, and most of the green plants are covered, resulting in a decrease in the photosynthetic rate, so that a large number of fish in the water die, and decomposers multiply, so that the oxygen content in the water decreases; In addition, a large amount of algae also consumes a lot of oxygen, and his respiration effect is quite obvious.

It's not the microbes that make the river black and smelly, it's the ecosystem that has a certain ability to self-regulate, and once it exceeds the limit it can regulate, the water will turn ugly and black. For example, when the amount of sewage discharged by industry is low, the river water will not stink and blacken. But when there is too much discharge, the river water will stink.

This is because there are saprophytic fungal bacteria in the river water, which can break down the organic matter in the sewage into water-inorganic salts.

The stench of the water body turning black and smelly is ().

a.Selenium and phenols.

b.Sulfide Liangzhou Nian hydrogen and ammonia.

c.Fluoride and nitrates.

d.Overhang, trapped floats and ammonia.

Correct answer to the Oak dilemma: B

Answer]: A hint potato grip The organic residue in the water is always the most serious pollutant that causes water pollution, and it is the main culprit of water deterioration, blackening, and smelling.

In fact, this is the sub-nutrient of water bodies.

Eutrophication is a phenomenon of water pollution caused by excessive content of plant nutrients such as nitrogen and phosphorus. Under natural conditions, the lake transitions from a flat trophic lake to a eutrophic lake, and then to a swamp and land, as the river entrainment impact and aquatic debris continue to settle and silt at the bottom of the lake. However, due to human activities, after a large amount of industrial wastewater and domestic sewage and plant nutrients in farmland runoff are discharged into slow flowing water bodies such as lakes, reservoirs, estuaries, bays, etc., aquatic organisms, especially algae, will multiply in large quantities, changing the number of biomass species and destroying the ecological balance of water bodies.

A large number of dead aquatic organisms are deposited at the bottom of Jingzhipai Lake, decomposed by microorganisms, and consume a large amount of dissolved oxygen, which greatly reduces the dissolved oxygen content of the water body and deteriorates the water quality, which affects the survival of fish and greatly accelerates the process of enrichment and eutrophication of the water body. When the phenomenon of eutrophication occurs in the water body, due to the mass reproduction of plankton, the water body often appears blue, red, brown, milky white, etc., which is called bloom in rivers and lakes and red tide in the sea. In the waters where red tides occur, some plankton multiply explosively, turning the water red, hence the name "red tide".

These algae have a foul smell, are poisonous, and cannot be eaten by fish. Algae shade the sun, so that the underwater plants are hindered by photosynthesis and die, and after decay, they release nitrogen, phosphorus and other plant nutrients for algae use. Over the years, this creates a vicious cycle of algae blooms, deterioration of water quality and fishy odors, resulting in fish deaths.