On Tuesday, Xiao Ming did not go to school after leaving home with his schoolbag, he went to Boss Xu's factory to pick up the goods.

The perfect high-pressure device is made, from the finish of the stainless steel to the joint treatment of the connection it to other instruments, which can show the good manufacturing technology of the small factory.

It is these small factories that are responsible for the strong economic growth of Xia Country.

Paying money to get the goods, Boss Xu is very good at being a person, and found a "slipper" to help Xiao Ming deliver the equipment to his home, and he still thought about the million-dollar business that Xiao Ming said.

Xiao Jianqiang worked the morning shift at the paper mill, He Hui set up a stall outside the paper mill, and Xiao Ming was the only one at home.

He placed the device on the ground and subsequently removed the bottle containing the colony of the type 1 anaerobic bacterium that was engulfed.

The colony bottle is divided into many layers, and all the layers of bacteria must be mixed together to be considered a complete colony.

Xiao Ming took out a little strain from each layer, introduced the culture reagent and anaerobic bacteria colony strains into the high-pressure bottle according to the experimental instructions, and finally plugged in the oxygen in the electrostatic extraction bottle to pressurize it.

According to Xiao Ming's drawings, the experimental high-pressure bottle has an observation port, a reagent addition port, and a liquid outlet port.

The reagent inlet can be added to the culture medium of fungi or sewage at regular intervals, while the liquid outlet can flow out of the liquid treated with anaerobic colonies, which is generally pure and drinkable water.

Perfect!

It took a whole morning, and Xiao Ming finally completed every step of the experiment.

The next step is to test the effect of phagocytosis 1 anaerobic bacteria.

Xiao Ming walked out of the door with a glass reagent bottle to look for sewage.

In the old family area, it is easy to find sewage, and the drainage ditches on the surface, the puddles after the rain, and the doorways of the fly houses are full of sewage.

Under the gaze of the old man, Xiao Ming endured the stench and filled 200 ml of glass reagent in the ditch in the family area.

"Manure, food scraps, all kinds of heavy metals, all kinds of harmful bacteria including E. coli, enough!"

Knock knock.

Xiao Ming walked back home quickly, and followed the experimental steps in the manual to put 200 ml of sewage into the inlet port.

Following the instructions for phagocytosis of 1 anaerobic bacteria, 1 ml of saturated colonies can treat 100 ml to 300 ml of sewage with a treatment time of half an hour.

Saturated colony awareness here means that phagocytosis 1 anaerobic bacteria must reach a concentration of 10^(-5) g/ml per milliliter.

Anxiously waiting for half an hour, Xiao Ming filled 50 ml of treated liquid with a sterilized reagent bottle. Because phagocytic bacteria tend to gravitationally and tend to colonize downward, the liquid poured out of the upper outlet will not have phagocytic bacteria.

At least, intuitively, the experiment was a success.

Because the sewage received from the ditch is yellow-black, and the liquid received now is colorless and transparent, like bottled pure water.

However, further experiments are needed to confirm that the effluent has been treated, and to verify that the liquid meets the standards for drinking water.

Xiao Ming has two experimental options:

1. Drink the 50 ml of water by yourself and see if you have diarrhea for a while;

2. Take it to the laboratory for testing.

The first way is more straightforward, but the risk is too great, and there are too many uncertainties. What if Xiao Ming's resistance is too good and kills all the bacteria in the water? Or the sewage is not treated at all, isn't Xiao Ming just drinking the dung?

It seems a little disgusting.

Veto.

The second option is to take it to the laboratory for testing, so that the most intuitive way to see what ingredients are in the water, including those elements contained, whether there are heavy metals, how much bacteria are there, whether it meets the drinking water standards, and so on.

Obviously, the second option is more realistic.

Jiangcheng City has an inspection and quarantine agency, which specializes in serving the society. It can test the pesticide content of food and the safety indicators of drinking water.

Of course, Xiao Ming can also take the sample water to the Jiangcheng No. 3 Middle School Laboratory, but Xiao Ming gave up this plan due to the poor equipment and dirty environment of the No. 3 Middle School Biochemistry Laboratory.

It's still worth spending some money.

There was no time to eat lunch, Xiao Ming took the test tube and left, he knew that the inspection and quarantine center was near the Jiangcheng Chengbei Industrial Zone.

This time, Xiao Ming rarely rode a rusty bicycle and spent 15 yuan to take a taxi.

"800 yuan for a test, and a sample will be sent after the payment is made. The staff of the window department has long lost their enthusiasm for their work, said mechanically.

After inspecting 800 pieces at a time, Xiao Ming's flesh hurts.

The results of the payment and other payments, Xiao Ming handed over the documents at half past one in the afternoon, and he could get the results at four o'clock.

"Brother does this too?" While Xiao Ming was waiting, a middle-aged man took the initiative to talk.

Xiao Ming was confused, only to see the man say: "There are many products in the market in the north of the city, one catches one accurate! After a while, I will go to the store that sells pickled products, sodium nitrite is absolutely exceeded, and I will not let them have a good time if I don't give me 5,000 yuan this time." ”

After a long time, this person specializes in inspection and quarantine business, Xiao Ming not only sighed: "It's really a champion." ”

"Liquid Xiao Ming!" a woman shouted at the window.

Seeing that no one answered, the woman shouted in a sharp voice again: "Liquid Xiao Ming has come out!"

"Brother, are I calling you? The middle-aged man reminded.

Xiao Ming came back to his senses, speechless, and shouted like this, he was not a sample, and he was still liquid Xiao Ming.

"It's coming, it's coming. Xiao Ming walked over quickly.

The middle-aged woman said angrily, "I've been shouting for a long time!"

"I'm sorry, I'm sorry!" Xiao Ming took the inspection and quarantine form.

The test content is divided into color, turbidity, odor and taste, total bacteria (E. coli single column), heavy metal content and so on.

This is a standard drinking water test indicator.

All indicators are qualified!

The total coliform bacteria and heat-resistant coliforms related to the cited standard are both 0. The heavy metal content is also 0!

Perfect!

Xiao Ming clenched his fists fiercely.

"Little brother is going to get the money?" said the middle-aged man laughed.

Xiao Ming just smiled and left quickly!

Among these indicators, the most informative thing for Xiao Ming about phagocytosis 1 anaerobic bacteria is that the coliform colony is 0.

There are fecal residues and food residues in the water in the gutters of the community, and the number of E. coli is definitely not 0.

In fact, according to the complete experimental guidelines, Xiao Ming must also take the raw water sample (sewage) here for testing, but after eight hundred and one times, Xiao Ming, who had an empty purse, gave up the standard experiment. Even so, the results speak for themselves! Phagocytosis 1 anaerobic bacteria are effective for sewage treatment!

However, whether it is effective for the sewage treatment of paper mills, Xiao Ming has to further experiment.

Xiao Ming, who was excited to go home, did not expect that he had skipped school for a day, and the head teacher had already contacted He Hui, who and Xiao Jianqiang were looking for people in various Internet cafes near the paper mill and school.

According to Xiao Ming's past urine, most of them went to the Internet café to play games again.

He Hui scolded anxiously: "This rabbit cub, I thought that he worked hard to do so well in the first examination, but today the head teacher said, I suspect this kid of cheating! ”