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Topics of this issue: Environmentally Friendly Water Treatment, Activated Sludge Method, Indicator Microorganisms, Introduction to Tardigrades.
Zhang Gong Matrix: Miao Zhi Shui Circle - the purest environmental protection enthusiast
Hello everyone, welcome to Miaozhi Water Circle! Yesterday I shared a little knowledge about tailworms, see: Activated sludge water treatment instruction microorganisms: the difference between tail filaria and bagworm! Environmental Engineering Collection
Today we continue to share a typical representative microorganism in the activated sludge method microbial phase - the tardigrade. First, let's take a look at a video of the living movement of the water bear under the microscope to deepen the impression of the water friends for this little guy.
After watching the video above, let's take a look at a brief introduction to the tardigrade. Water bears are called tardigrades because their insects resemble small teddy bears, and they are also called bear worms, and the body length of the insects is between 50 and 1400 microns. It has 8 feet, and claws can be observed on the feet.
In the activated sludge microbial phase microscopy, it can be observed that the tardigrade sometimes seems to be buried in the floc, in fact, between the floc and the floc, the insect body shows a posture of walking while sliding and swinging left and right, which is very easy to identify. When the tardigrade preys, it sticks out of the mouth at the top of the head and sticks into the food, relying on the action of the pharynx to inhale it. Water bears are hermaphrodite, and female water bears leave their eggs in the shell after laying their eggs.
In the activated sludge method water treatment process, its appearance can be observed when the sludge stays for a long time, the treated water is good, and when the sludge disintegration leads to the detection of suspended solids in the effluent.
Stick figure of a tardigrade
For the tardigrade, Xiaobian has always believed that with its "appearance", it is absolutely at the top of the dozens of microorganisms typical of the activated sludge method, and it looks like there is even a little bit of "cute" "cute pet" under the microscope.
However, the most surprising thing is not its appearance, but this insect that looks a little "cute", and its tenacious vitality is enough to throw off hundreds of streets that are called "undead".
The movement of the tardigrade
Water bears, also known as tardigrades, are a common name for tardigrades, and there are more than 900 species recorded, many of which are distributed worldwide.
From time to time, the mouth at the top of the water bear's head protrudes from time to time for predation
The tardigrades are extremely small, with a minimum of only 50 microns (human hair is 60-90 microns in diameter), while the largest is 1.4 millimeters and must be seen with a microscope.
The surface of the water bear's body is covered with a water film that is used to avoid drying out the body while breathing oxygen in the water film. It lives mainly in freshwater sediments, moist soils and water films of bryophytes, with a few species living in the intertidal zone of seawater.
Tardigrades mostly survive by sucking up the juices of animal and plant cells with sharp stings, and a small number of tardigrades are carnivores.
The living environment of the water bear is very extensive
The biggest feature of the water bear is that it is born from the egg and has reached adulthood, and the number of cells in the body does not change for life without childhood. Tardigrades are transparent and colorless throughout.
The body of the tardigrade bear is generally transparent
But what is the reason why the tardigrades we see generally have color? This is mainly given by their food, manifested as yellow, brown, dark red or green.
Water bear under electron microscopy
The water bear is super vigorous, and can survive in the state of freezing, boiling, air drying, and even in vacuum or under radioactive radiation.
According to the test, the bear worm can be safe under the pressure of 600 million pascals, which is 6,000 times the atmospheric pressure, which is twice the pressure limit that most organisms, including bacteria, can withstand.
The tardigrade is under the strong acid of the PH value of 1 and the strong alkali of the PH value of 13, the tardigrade is still fine, and in such an environment, the human being is dissolved and even the bones are not left.
In addition, the tardigrade can also live in the microwave for a very long time, and if it is replaced by humans under the same intensity of microwave, it will be roasted in less than 1 minute.
Water bears are also extremely tolerant to salt, and scientists have found water bears that have hibernated for thousands of years in salt mines, and after giving it water and nutrients, it can wake up and continue normal physiological activities.
Vitality and its tenacious water bear
The phrase "the tardigrade is the most vital species that exists on earth" is truly well-deserved! Some people say: even if there is a nuclear war in the world and all other creatures go extinct, as long as the earth is still there, they can continue to survive! I don't know if you sailors agree?
That about today's sharing we will say here, but also want to pay attention to more activated sludge method to indicate microbial knowledge, hurry up to pay attention to this number! If you want to communicate with the water treatment peers, you can leave a message in the message area, Xiaobian will reply to everyone in the first time, so that you can improve your technical level as quickly as possible!