"How is it? Is it okay?" Xu Fugui asked Duan Yun after leading Duan Yun to look at the cave.

"Not bad. Duan Yun nodded with satisfaction, and after a while, he asked Xu Fugui, "I remember that there is a river nearby, right?"

Duan Yunxiao often went to the two villages of Ma Junying and Xintianbao to play, and he remembered that there was a river called 'Yuhe' and the locals called 'Shili River' behind the village.

In the memory of Duan Yun's predecessor, the river is very wide, the current is very rapid, and every year in the rainy season here in Daxing, the width of the river can even reach twenty or thirty meters, and there are many fish and shrimp in it.

Duan Yun considered that if he built a workshop here, the waste materials and sewage must also be properly disposed of, especially the chemical solutions such as corrosive liquids used in processing circuit boards if they are not properly treated, it is likely to pollute the farmland, and even lead to the poisoning of livestock and local people, so these are all things that he must consider in advance.

In fact, with the current production scale of Duanyun Small Workshop, the waste liquid such as ferric chloride used in a day is actually very small, but over time, coupled with the expansion of the scale of Duanyun Workshop in the later stage, if these waste liquids are not treated well, it will definitely cause a lot of pollution.

Ferric chloride is used to corrode copper in the production of printed circuit boards in the electronics industry, and in this process, copper is dissolved in the liquid, polluting the environment with the discharge of waste liquid, and causing excessive heavy metals in land and rivers.

For the treatment of this waste liquid, Duan Yun still knows a little, and the easiest way is to dig a sewage pool first, and use the sedimentation method to let most of the heavy metals in the liquid precipitate and then discharge it after reaching the discharge standard.

Duan Yun will definitely need to process more and more circuit boards in the future, not only the amplifier of the antenna, but also other electrical equipment, if the precipitation method is used, it will obviously be a lot of waste.

Therefore, Duan Yun thought of another way to deal with waste liquid, that is, electrolysis and recycling of waste liquid, the specific method is to put two graphite electrode rods into the waste tank, after power, after the chemical reaction, the copper cathode is precipitated, the anode chlorine gas is generated, and the copper atoms in the waste liquid are continuously precipitated, attached to the graphite rod, and attached to the graphite rod of the negative electrode.

At the same time, Fe+2 gradually becomes Fe+3, and the color of the solution gradually returns to brown, and the solution is regenerated and can be reused.

As for the principle and production of electrolyzer equipment, it is also very simple, Duan Yun can use the waste materials in the warehouse in the factory to find someone to process them, and other things can also be bought in hardware stores.

However, regardless of whether there is a point solution equipment or not, Duan Yun needs to make a waste sedimentation tank in case of emergency, and the treated waste liquid is best discharged into the river, which is why Duan Yun asked about nearby rivers.

"Behind the dirt slope is the Ten Mile River. Xu Fugui pointed to the direction behind the cave with his hand and said.

"Show me. ”

"Then let's go. Xu Fugui said, leading Duan Yun towards the dirt road leading to the back of the cave.

Bypassing the dirt slope where the cave was located, Duan Yun really saw a slender river in front of him.

But the gap between the river in front of me and the river in Duan Yun's predecessor's childhood memory is a bit big, a large area of the river has dried up, countless river pebbles are exposed to the sun, the soil is dry and loose, and the river is only two or three meters wide, which is more than ten times smaller than the dozens of meters wide river in his memory.

In addition to the narrowing of the river, the water and dirt of the river are unbearable, and the sludge at the water's edge is blackened, which is obviously polluted.

"How did this river become like this, I remember when I was a child, the river was quite wide and the water was quite clean?" Duan Yun said with a frown.

"How long has it been since you've been to this river?"

"After graduating from junior high school, I went to the countryside to join the queue, and it will only be a few months since I came back. Duan Yun replied.

"No wonder. Xu Fugui nodded when he heard this, and said: "A few years ago, a reservoir was built in the upper reaches of the Shili River, except for the rainy season, there is usually no water flow in this river, and there are several more coal washing plants upstream in the past two years, and the people in the village can still wash clothes here, but now they can't do anything......

When he said this, Xu Fugui's face showed regret.

Duan Yun was also a little stunned when he heard this.

There was once such a sentence that reflected the increasingly serious water pollution of China's rivers in the past few decades of reform and opening up:

"In the 70s, rice washing and cooking, in the 80s, watering flowers and irrigation, in the 90s, fish and shrimp were ......"

With the spring breeze of reform and opening up, all parts of the country began to pay attention to the development of the local economy, and more and more enterprises and factories were built, but limited by the backwardness of capital, technology and ideology, the environment in many places has become the 'funeral goods' of economic development, and Daxing City, as a key resource-based city in the country, is also one of the hardest hit areas.

But Duan Yun is thinking that he wants to operate in this village for a long time, and the destruction of farmland and rivers will have a great impact on the local villagers, so even if he spends a little more money, he must solve this sewage problem.

"Secretary Xu, I want to build a small sedimentation tank next to the cave, and the outlet is connected to this river, can your village do this?" Duan Yun asked Xu Fugui after pondering for a moment.

"Sedimentation tank?"

"It's a small reservoir, more than two meters wide and more than one meter deep, and the pond can be treated with cement to prevent seepage. Duan Yun made a rough gesture with his hand.

"Ah, it's easy. Xu Fugui suddenly suddenly, and then said: "It's easy to say that the labor is good, that is, the cement is more expensive, and a few dozen yuan is enough." ”

"That's okay, I'll give you fifty yuan, and I'll bother Secretary Xu to help solve it. Duan Yun said, took out fifty yuan from his pocket and handed it to Xu Fugui.

"Well, let's talk about it, I'll arrange for someone to make this pool when I go back. After Xu Fugui took the money from Duan Yun's hand, he said to Duan Yun with a smile on his face: "That little Duan, do you still need people in this workshop?"

Xu Fugui apparently hoped that Duan Yun would be able to recruit more workers in the village.

"I want to hire more, too. Duan Yun smiled when he heard this, and then said: "Secretary Xu, you are also a person who understands the national policy, there are already four workers on my side, plus three people in your village, it is exactly seven people, if there is one more, it will violate the country's policy of 'seven up and eight down'......"

Duan Yun's 'seven up and eight down' is Marx's assertion in Capital.

"When the number of hired workers reaches eight, it is not an ordinary individual economy, but a capitalist economy, which is exploitation."

This is the line between "small proprietors" and "capitalists" clearly demarcated by Marx in "The Rate of Surplus Value and the Quantity of Surplus Value" in Chapter 9 of Volume 1 of Capital. According to Marx's calculations, at that time (the middle of the 19th century), those who employed less than eight workers, who themselves directly participated in the production process like the workers, were "intermediaries between capitalists and workers," that is, small owners, while those who employed more than eight began to "appropriate the surplus value of the workers" and were capitalists.

At the end of the 70s of the last century, the opening of self-employed businesses, the lifting of the ban on rural cottage industries, and the restoration of urban and rural small commodity markets - the private economy began to sprout in Chinese mainland.

So a series of problems arise. About hired labor, the famous "fool melon" question. If according to Marx's theory, the line should be between seven and eight. Seven hired men could get on the horse, and eight would naturally dismount.

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