After Chi Shao woke up, everyone in the Teng tribe breathed a sigh of relief, and bright smiles appeared on everyone's faces again.
Because the weather this year is pretty good, the crops are growing luxuriantly, and the various farmed beasts and birds are also breeding rapidly.
With just a few more generations of breeding, these beasts and birds will slowly become domesticated into real poultry and domestic animals sooner or later.
On the east bank of Feiyu River, most of the processing workshops have been relocated one after another, and even the breeding areas have also been moved to the east bank, because Jiang Xuan wants to prevent domesticated livestock from spreading some diseases in advance.
However, with this, an obvious problem arises.
That's sewage.
Whether it is smelting bronze, tanning animal skins, purifying mineral salts, making pottery, etc., a large amount of sewage will be produced.
In the past, when the tribes were small, these workshops were also small and scattered, so the sewage phenomenon was not particularly obvious.
Now, as the vine tribe becomes larger and larger, each workshop is also getting larger, and more and more sewage is produced.
In addition, the sewage from various workshops is now discharged almost randomly, resulting in a lot of land being polluted, and a foul smell can be smelled from a distance.
"It won't work if we continue like this. If we discharge it casually, sooner or later, Feiyu River will turn into a smelly ditch. By then, we will need to get drinking water from other places."
Jiang Xuan walked in the primitive industrial zone on the east bank, looking at the polluted soil and smelling all kinds of pungent odors, and felt very bad.
Xian Er, the leader of the guard team at the second residence, accompanied him and said cautiously: "Chief, is it really that serious?"
The tribal people have never seen what real industrial pollution looks like, and they don't care much about sewage, thinking it's not a big deal.
Before that, Xanthium sibiricum also thought the same. Although the smell was a bit stinky, it didn't seem to be a big deal.
"If we continue to discharge indiscriminately like this, the situation will be ten or a hundred times more serious than what I said!"
Jiang Xuan knew that Xanthium could not believe it, so he asked a guard soldier to go to the river and catch a few shrimps.
There were a lot of shrimps and crabs next to the Feiyu River, and the soldier soon came back with a few big shrimps.
"Watch it."
Jiang Xuan threw the shrimps into a drainage ditch outside a garment workshop.
The soil in this drainage ditch has turned black, and the sewage is even more smelly. The prawns are the most sensitive to water quality. As soon as they enter the water, they crawl out desperately.
Jiang Xuan used a stick to carry them back into the water, and they continued to crawl out.
"See? Even shrimps can't survive in this kind of water. If you put a fish that can't crawl, it will die soon."
"Think about it carefully. If one day the river is filled with this kind of sewage, fish, shrimps, crabs, including water hyacinths that can turn into giant dragonflies, will all die or flee this area."
"The crops we plant will also not grow taller or bigger, or even die directly."
"At that time, what should we do?"
Jiang Xuan's words finally made Xanthium and others take it seriously. Just thinking about that terrible scene makes people's scalp numb.
"Chief, what should we do?" Xanthium looked at Jiang Xuan, because he knew that Jiang Xuan must have a way.
"What to do? Of course it's to treat sewage."
Jiang Xuan pointed to all workshops, including the breeding area: "All places that produce sewage should have unified drainage pipes. The sewage should be collected and treated before it can be discharged into the river."
"Chief, what is a drainage pipe?"
"Drainage pipes are, of course, pipes that can drain water. We can make ceramic drainage pipes, bury them in the ground, and cover them with soil. This way, where the sewage flows through, there will be no odor or pollution.
That’s a lot of land.”
After listening to Jiang Xuan's words, Xanthium nodded in enlightenment. He had seen the tribes using bamboo to collect water from a distance, and thought that this drainage pipe should be similar in shape to a hollow bamboo.
"What about after collecting the sewage?"
"Of course it's filtered and purified."
Xanthium scratched his head. He didn't quite understand what "filtration" and "purification" meant, but he didn't ask any more questions. He would know by then anyway.
Jiang Xuan first chose a relatively low-lying place to build a sewage treatment plant.
Later, he went to the pottery workshop and kneaded a circular pipe pottery base from clay.
This kind of circular pipe has an outer eaves on one end and an inner eaves on the other. By combining the inside and outside, the two pipes can be spliced ​​together.
A bit like a ceramic chimney, but much larger and thicker.
Today's pottery workshops are no longer the two cross-ventilated kilns of the past, but two earthen kilns as high as a house, which can bake many large pottery at one time.
After Jiang Xuan made the first ceramic blank for a circular pipe, he explained the function of the pipe and the splicing method to the craftsmen.
This thing is not complicated, and there is already a ceramic blank as a model, so the craftsmen can understand it as soon as they hear it.
"Don't worry, chief, we will try our best to burn enough pipes."
Jiang Xuan nodded and said: "Everyone, please work hard. Sewage treatment is very important to all of us. The people of the future will be forever grateful to you."
When Jiang Xuan said this, those craftsmen suddenly felt a sense of mission and became more motivated.
After leaving the pottery workshop, Jiang Xuan found the newly formed engineering team of the Teng tribe.
As tribes grew larger, building houses, building roads, digging ditches, etc. all required a large number of manpower.
Therefore, Jiang Xuan specially set up an engineering team to train a group of tribesmen into a professional team in construction.
In this way, whether it is building a house or building a road, the efficiency will be greatly improved and the quality will be guaranteed.
The leader of the engineering team, named Hongtu, is a middle-aged man who looks very honest and honest.
He has dark skin, is not tall, but is very strong, down-to-earth and hard-working, and does not care about things. Jiang Xuan likes this kind of person very much.
"Hongtu, I need your engineering team to go to the east coast to build a sewage treatment plant, then dig trenches, lay pipes, and guide all the sewage to the sewage treatment plant."
"Chief, how should we build this sewage treatment plant?"
"Simple, just build two houses and six filter tanks."
Jiang Xuan thought for a while and then said: "You may not understand what I'm saying here. So, just follow me over there and I'll tell you slowly."
"good."
Jiang Xuan brought Hongtu to the east bank, first told him about the dangers of sewage, and then told him his idea bit by bit.
"Look, we dig a trench outside each workshop and lay ceramic pipes so that all the sewage can be collected through the pipes."
Jiang Xuan used soil to shape a few small pipes and demonstrated to Hongtu how to lay the pipes.
This thing is not complicated. After Jiang Xuan's simple demonstration, Hongtu understood it immediately.
Jiang Xuan can always come up with some new and practical things, Hongtu admires him very much.
Later, Jiang Xuan took Hongtu to the location of the sewage treatment plant he selected.
"In this place, on the left side, two houses can be built, slightly farther away, to house the tribesmen in charge of this place."
"On the right, along this slope, dig six large pools."
"The first pool is covered with large pebbles at the bottom, which is used to filter larger garbage in the sewage."
"The second pool is paved with smaller pebbles."
"The third pool should be paved with coarser gravel, and the fourth pool should be paved with finer gravel."
"Put a layer of charcoal under the fifth pool and spread fine sand on top."
"In the sixth pool, there is a layer of sand and a layer of charcoal, five layers in a row. In this way, the sewage flowing through the six pools should be turned into relatively clean water that can be discharged into the river.
.”
After Jiang Xuan finished speaking, Hongtu nodded frequently. He tried his best to remember every word Jiang Xuan said. Although he could not fully understand why he did so, he believed in Jiang Xuan's wisdom.
"Let's do this. When I get back, I'll draw a diagram for you, and your engineering team can just follow the diagram. You don't have to bother memorizing it."
Hong Tu breathed a sigh of relief and said, "It's best if you have a picture."
"Okay, then I'll send it to you after I finish drawing it."
Jiang Xuan left the East Bank with Hongtu by boat and returned to the West Bank residential area.
Afterwards, he returned to his room, took out a blank animal skin roll, and began to draw seriously.
He clearly drew the location of each workshop and the location of the drainage pipes on the map.
Later, he also drew the construction area of ​​the sewage treatment plant and the locations of the six filter tanks one by one.
To be continued...