How can Princess Xuancheng say that Wu Laojiu is a slut? In the end, you can only give in.

said to Wu Ning: "Help you with this, you can!" However, there is a condition for the old body. ”

Isn't that the end of it?

Wu Ning hurriedly changed his face, "Your Highness, you said, but if there are any requirements, Zijiu will definitely find a way to achieve them." ”

"Hmm....." Xuancheng pondered for a moment.

First asked Xiang Wang Miao, "Is this rebuilding of the sewer going down to dig up all the sewers of each family?" ”

Wang Miao nodded, "That's inevitable." ”

"If so!" Xuancheng finally said, "My husband can't help you openly, he can only be in the dark, okay?" ”

Wu Ning: "......"

Wu Ning was completely speechless, isn't this still afraid of offending people?

At the same time, he was full of sympathy, and said in his heart, what kind of grievance does this family have to be to be careful to this point?

"No problem! If anyone is dissatisfied, they need to pass the pass first. Your Highness, you can rest assured this time, right? ”

"Okay!" Princess Xuancheng finally nodded and said to Wang, "It's okay for the husband to help Zi investigate this time." ”

......

————————————

It can only be said that Wu Laojiu is too cheap, and he almost used despicable means to invite Wang Miao out of the mountain.

However, Wu Ning knows very well that Wang Miao is willing to help, but there must be a gap in his heart, and whether he can let go of his hands and feet is another matter.

Wu Ning is in trouble again, how can he let Wang Miao have no worries and concentrate on his work?

In the final analysis, Xuancheng has too deep a grudge with Xiao and Cheng over the years, and the old lady Wu is fierce, which scares this family out of trouble.

......

In the end, Wang Miao agreed to help Wu Ning rebuild the sewer, but Wu Laojiu's requirements were very high, and Wang Miao couldn't come up with a plan for a while.

Wu Ning demanded that the Chang'an sewer system be repaired to the best without considering the cost, layout and other factors.

Not only must we completely cut off the pollution of underground water sources caused by sewage infiltration, but also the eight waterways around Chang'an on the ground should not be infringed upon by Chang'an's huge population, and the best thing is to achieve waste utilization and harmless sewage treatment.

This stumped Wang Miao.

Because these requirements and concepts put forward by Wu Ning were too advanced in the era of 1,300 years ago, Wang Miao had never heard of them.

In addition, he has not touched the matter of water conservancy for more than 20 years, and many things have to be refamiliarized.

Therefore, Wang Miao only promised Wu Ning to try it first, and as for whether it can be successful, he has to say another thing.

Wu Ning also promised Wang Miao that whether he wanted money or people, the city superintendent would help him.

As for other considerations, there is no need to be distracted.

......

I have to say that Wu Ning's requirements are a bit high.

The so-called environmental protection really has no concept at all in this era, and it is a little too advanced.

However, Wu Ning felt that it was still necessary to give it a try.

After all, a large city with a population of 2 million, if there is no environmental awareness, no matter how blessed it is, it will not last long.

Just like Wang said before, the decline in the groundwater level in Chang'an is caused by the sudden increase in population and excessive water use.

In fact, Wu Ning knows better than him that the sudden increase in population is only one of the reasons, and the fundamental problem is soil erosion on the Loess Plateau and the loss of vegetation.

Including the pollution of groundwater in Chang'an City, there are also causes of vegetation destruction.

In other words, the drastically reduced vegetation coverage rate has made the soil self-healing ability of the Loess Plateau unable to keep up with the pace of human survival.

This point, with the popularization of black bamboo charcoal, although it is improving little by little, it is still a large project that requires long-term investment.

And Chang'an's pollution control, if you look at it from this point of view, is no longer a city's problem.

It will set a benchmark for the entire Ganshan region, and even this era, and then form a little concept.

In this way, Wu Ning has to give it a try.

Because, its significance is far-reaching.

......

————————

In the following days, Wu Laojiu was idle, because the work was handed over to Wang Miao!

Wu Ning, who had nothing to do, could only wait, waiting for Wang Miao to come up with a set of practical plans.

Of course, Wu Ning didn't have nothing to do, and occasionally went to Wang Miao to see if he needed anything.

Relying on the insight of his later generations, he can also come up with something useful.

For example, "graded filtration and sewage tank" is a method that Wang Miao came up with under Wu Ning's prompting.

As the name suggests, this is a system for decontaminating sewage.

......

In this era, pollution control is good because there is no chemical pollution, and domestic sewage is still the mainstay.

Among the domestic sewage, feces are also easy to say. In Wang Miao's words, since the cost is not counted, it is entirely possible to divert the fecal sewage from the culvert to the outside of the city and build a large manure tank to store it.

In this way, the problem of fertilizer use by farmers can also be solved.

The only trouble is other sewage.

According to the past practice, this part of the sewage was not left to be treated at all, and was directly discharged into Weishui.

But Wu Ning didn't do it, saying that it polluted Weishui in this way, and this part of the sewage had to be cleaned and treated before it could be discharged.

This stumped Wang Miao, because there was no such technology at all.

Thus, this "graded filtration tank" was born.

To put it simply, it is to build a sewage treatment plant in the southeast corner of Chang'an City, and transform the existing hibiscus pond into three pools ranging from high to low.

The first pool is filled with sewage from the city, and the bottom of the pool is covered with sand and gravel, and a seepage is made at the place where it is connected to the secondary pool, so that the sewage can be filtered through the sand and gravel and seep into the water of the second pool.

Then put finer sand and gravel in the secondary pool, filter one more, and infiltrate into the tertiary pool.

In the tertiary pool is the charcoal slag, that is, the burnt cinder. This thing is full of honeycomb-shaped pores inside, and it is carbonaceous, and it has a strong adsorption capacity.

After these three filtration processes, the sewage in the city can basically reach the level of repurification.

Although Wu Ning didn't know that this would meet the standards of water quality in later generations, it was far better than directly discharging sewage, so as not to pollute Weishui anymore.

Although Wang Miao and they felt that it was too much, Wu Ning knew that although there was nothing to see now when this sewage pond was built, in a few tens or hundreds of years, future generations would not know how to thank their predecessors for their gifts.

......

In addition to studying the Chang'an water with Wang Miao, Wu Ning also gave Mrs. Wu an excerpt.

The main thing is to remind the old lady that the time to spend money has come, and it is a lot of money. You always be mentally prepared not to scare you when you want to.

In addition, Wu Ning also mentioned a few words about Wang Miao.

Probably, after looking for a long time, it turned out that Princess Xuancheng's concubine was the middle master, and now she has devoted herself to the cause of benefiting the people of Chang'an.

Moreover, Wu Laojiu also had a few more words, and told Wu Zetian about the request that Princess Xuancheng finally made to Wu Ning.

......

"This!!" Wu Zetian stared at it.

"What are you telling me about? I don't know if I squeezed me, does it mean that I made the Xuancheng family so miserable? ”

......

, (plus more one, ask for a monthly pass!! ）