In fact, Jiang Xingchen's inspiration did not come from the old man, but from the second brother's sentence that it would be good not to eat Xiang at the end.

When he first asked the Duan family to build a new town, Jiang Xingchen fully considered the problem of urban life pollution and asked for the construction of underground facilities, not only to prevent waterlogging, but also to discharge sewage.

At that time, he also thought about the disposal of septic tanks, and it was necessary to prevent accidents such as biogas explosions.

These days, he has been worried about the matter of fuel, and he is reluctant to use a lot of charcoal, for fear of affecting the environment of the Star Realm. But they forgot about biogas, which is the best fuel.

In the last generation, many rural households built small biogas digesters, which were often seen on television. It is said that the biogas produced from the manure of four or five pigs is enough to supply a family of three or four for a day's daily life.

He doesn't know if this statement is true, but in Xingchen Ling, not to mention the domestic waste generated by a large number of tourists, there are hundreds of thousands of livestock such as cows, horses, and pigs in the farms outside, and the biogas produced is definitely not a small amount!

If this manure is collected and placed in a confined space to produce biogas. Then pass the guò pipe to the boiler...... The manure produced after biogas is not wasted, and can be used as fertilizer and returned to pasture or crops to promote the growth of forage...... In this way, a green cycle is formed.

The more Jiang Xingchen thought about it, the more excited he became, and he couldn't control his joy at all.

You must know that at the beginning, he was just researching rubber products and making bicycles, which was definitely a big money. Able to solve the construction of funds for a long time.

But one project is connected to many projects, and it takes a lot of mechanical force to refine rubber. Not to mention the drought this year, the river does not have much water. Even when it's big. Jiang Xingchen didn't have a bottom in his heart to drive the machine tool with water drainage, and the windmill was not very suitable. In the end, the only option was to study the steam engine.

But the steam engine is also not simple, and fuel is a problem. Water injection is a problem, pressure test is a problem, and finally there is a problem, that is, the material of the inner wall of the boiler, pressure resistance, rust resistance, it is estimated that the alloy needs to be studied.

Although there are many problems, they must be overcome one by one, and now there is hope for the fuel problem.

Of course. Whether it can produce biogas has to be done, and the production of biogas is the credit of bacteria, but it is not clear whether there are these bacteria in this world. Even if there is, it is unknown whether methane can be produced. After all, there is a difference between this place and the earth.

Because he was in a hurry to do the truth, Jiang Xingchen smiled and said thank you to the old man, turned around and ran. made the old man think that this child's brain was broken, and he blacked him for a long time, and he thanked himself.

"Could it be that Little Soul Dan was really driven crazy by me, when did I become so powerful!" the old man touched his face. Muttered, followed by a narcissistic smile.

At this time, Zhao Danqing and the second brother looked out from a corner and saw Jiang Xingchen leaving. Only then did he come out carefully.

"Look at your little guts, is the little soul so terrifying?" said the old man with disdain.

"Hmm!" the two nodded in succession and said, "Pretty scary!"

"So what. It's not that I'm scared away!See my ancestor's strength, follow me in the future...... That's right. We'll have to do it all over again!" the old man suddenly remembered the card again.

But the second brother and Zhao Danqing ignored the old man, but said, "Brother Jiang is a little strange. Normally, there must be something wrong with him coming to us. But in the end, I ran away without saying anything, which is so weird!"

"Uh!" the two of them said, and the old man's curiosity was suddenly aroused, thinking about it carefully, it was really like this, if the little soul was fine, he would not come to the Iron Sword Mercenary Group.

"Isn't it that some new dishes have been invented, and we are here so that we can taste them?" Zhao Danqing swallowed.

"Definitely not, now that Xiao Soul is busy writing and painting all day long, how can he have time to study new dishes!" the old man shook his head.

The second brother asked, "Then do you know what Brother Jiang is doing when he writes and paints?"

"I don't know!" the old man shook his head decisively, how could he understand those things.

"Then have you ever seen what he writes and paints?" the second brother asked again.

"No!" the old man shook his head decisively again, since he couldn't understand it, how could he be interested.

"Still, old man, how do you know that he is not drawing a picture of a new dish, not a recipe?"

"That makes sense!" the old man's eyes lit up, and he swallowed a mouthful of saliva at that time.

Zhao Danqing muttered: "Brother Feijiang is here to let us taste new dishes?"

The more I thought about it, the more likely it was, Zhao Danqing exploded at once, and said loudly: "Old thing, it's all your fault, now Brother Jiang has run away......"

But before he finished his words, the old man suddenly jumped out, and disappeared in a flash.

"Damn!" Zhao Danqing burst into a foul mouth: "Old immortal, you still have a little bit of discipline, and you want to eat alone!" followed and chased out.

The second brother twitched the corners of his mouth at the end, you still said that people have no discipline, who licked his face and said that he was messing with others just now......

Jiang Xingchen returned to the Lord's Mansion and immediately started researching the biogas digester!

First of all, the biogas digester had to be a confined environment, the principle of which he did not know, but he remembered the requirements.

In addition, the biogas digester he built must be larger, after all, it is not for household use, cooking, boiling water is finished, this is to burn the boiler.

Another is the location of the site, which should not be too far from the boiler, otherwise the pipe laying will be a big problem...... As for how to expand the use in the future, we have to wait until we go back, at least after the cold drilling technology of steel pipes comes out.

He was sketching here, and the old man appeared behind him quietly, and said with a smile: "Boy, busy!"

"Oops!" Jiang Xingchen, who was engrossed, was startled, and threw away his pen.

"Hahaha......" The old man couldn't help but burst into laughter.

Jiang Xingchen's face turned black at that time, and he pointed at the old man and scolded: "Old immortal, you are not finished yet!

When the old man saw Jiang Xingchen's anxious eyes, he didn't dare to laugh. Hurriedly waved his hand: "Boy, I didn't mean to scare you. Normally, no matter how small I enter the house, you can know it!"

"Huh~" Jiang Xingchen certainly knew, with his perception of fluctuations. Of course, the old man can't hide it from him when he comes. But the key is that my attention just now is on the design of the biogas digester.

"Forget it!" Jiang Xingchen waved his hand, feeling that his heartbeat was gradually returning to normal, so he stopped caring and asked, "What are you looking for me?"

"Hehe...... old man let out a smile that made Jiang Xingchen feel a little cold, and said, "Boy, are you researching any new dishes again?"

The tone was so soft that people's skin was numb, Jiang Xingchen couldn't help but rub his arms, and said impatiently: "Old man, how did you figure it out." Can't you see how busy I am now, how can I have time to research new dishes...... Didn't you say that you will go to the restaurant to eat Buddha and jump over the wall in the future, then hurry up!"

The old man saw that it was soft, his face changed, and he said loudly: "Boy, don't lie to me! You must be researching a new dish, you can't be wrong, did you write a recipe just now?"

"I'll go for it~" Jiang Xingchen almost sprayed, I designed a septic tank. You say it's a recipe. Your taste is too heavy!

"No, I'm looking into something else...... Okay, don't mess with me, let's go quickly!" Jiang Xingchen drove people out again.

"No, there must be something wrong with you driving me away in such a hurry......" the old man didn't believe it at all. Then he turned into a detective and said, "Besides, you just went to the Iron Sword Mercenary Group to find us. With your usual habits, you will never go to Iron Sword to find someone if you have nothing to do...... But what can you do with us? If we were to work, we wouldn't run away! That would be a good thing for us...... Most likely, we will make a new dish for us to taste!"

"Oops~" Jiang Xingchen was really speechless. I'm going to look for you just to have a new dish for you to taste. You don't want to think about it, you tricked me several times, it's good that I didn't take revenge, even if there is a new dish, I won't give it to you... It's a god analysis, the little fat man next to Conan is stronger than him after his head was squeezed through the door.

"I really didn't study new dishes, I studied fuel systems! I don't believe you look at it!" Jiang Xingchen handed the drawings to the old man.

"I won't look at it!" The old man stretched out his hand to block it, and said lightly: "Anyway, I can't understand it, who knows if you just took a drawing out to fool me, the recipe has already been hidden!"

Jiang Xingchen was also a little anxious at this time, and said loudly: "I said no, I don't have it, do you believe it or not!"

"No way, why don't you go to Iron Sword and find us?" the old man insisted.

"What the hell shall I make kidneys...... I'm going to find Zhao Danqing to ask for someone, and ask him to send a member of the group to the cursed land, and those sacrifices in Nari will be handed over to Da Futeng, and it will be more convenient to have an acquaintance there!"

"Still not right......"

"Damn, I have a new dish, and I just won't give it to you, what's the matter!" Jiang Xingchen was really anxious this time.

"If you don't give, you won't give, as for you...... Look at your anxious white face, I don't want you!" the old man muttered, turned his head and walked out of the door.

As soon as his front foot came out of the door, he immediately waved his fist hard, and said with a smile: "It's good to have new dishes." I'm afraid you won't admit it... As for whether to give it to me or not, it's not up to you to decide! As long as you make it, you won't be able to escape the palm of my hand!"

As he spoke, the old man sniffled, as if searching for a scent.

But after a long time, he didn't smell anything, so he patted his forehead and shook his head.

At this time, Zhao Danqing and the second brother also ran over and asked, "Old man, how is it, is it the same as what I judged?"

"It's the same fart, Jiang Xingchen is designing a new dish at all!" The old man's face was flat, and he said sternly: "This kid went to Tiejian just now to let you send someone to the cursed land, and the sacrifice of Nari should be handed over to Da Futeng, and it is more convenient to go to an acquaintance!"

"Oh, so that's the case!" Zhao Danqing couldn't hide his regret and shook his head again and again.

The old man patted Zhao Danqing and didn't say a word, as if he was all in his words. Then he turned around and walked away with his hands behind his back.

When the old man walked away, Zhao Danqing and the second brother glanced at each other and laughed: "This old guy is lying!" (to be continued......