How to build a sewage treatment plant scientifically?

The construction of township sewage treatment plants cannot be completed at once.

How to balance short-term demand and long-term development and test people's wisdom.

Flexible planning can avoid "excess"

Venue: Guizhou Town, Zigui County

The sewage treatment plant in Guizhou Town, Zigui County is close to the Yangtze River, and has two production lines with a designed treatment capacity of 3000 tons/day.

The reporter saw that only one of the two production lines was running. "In the first 65,438+00 months of 2065,438+06, more than 440,000 tons of sewage were treated, with an average of 65,438+0,482 tons per day." Zhu Daoqing, director of Guizhou Urban Construction Environmental Protection Center, said that the factory was officially put into operation in 2007, and it has been nearly 10 years, and it has never been operated at full capacity. In the final analysis, the population of this town is decreasing.

At the time of initial design, the factory was designed according to the scale of 6.5438+0.2 million people. However, the immigration policy has changed. Most of the immigrants who originally planned to settle in the town have moved out, and the population of the town is less than expected. At present, there are 7632 people in the town.

In Zigui County 12 townships, 7 townships have built sewage treatment plants, 2 townships have been put into trial operation, and 3 townships are to be built. It is expected that the full coverage of township sewage treatment will be realized this year. Those newly-built factories have a more realistic processing scale and technical path because they have absorbed past experience. "The preliminary planning of township sewage treatment plants is very important, and the treatment capacity should leave room for future development and changes." Tan Zisong, head of the Village and Town Section of the Housing and Construction Bureau of Zigui County, said that each local sewage treatment plant needs financial subsidies of more than 200,000 yuan each year. If you don't calculate carefully, it will be a great burden.

The future is bright, and the "merger" has solved the embarrassment.

Venue: Hexiong Town, jiangling county

Jiangling county He Xiong Town Sewage Treatment Plant has been idle for 6 years since its completion in 2009. The equipment in the factory has weathered and rusted.

In 20 15 years, the town spent hundreds of thousands of yuan to completely transform the treatment plant with new technology and equipment, and finally it can run normally. The reporter saw that the factory has been renovated and the machinery and equipment are operating normally.

However, the transformation has also brought new problems. The original design capacity of the treatment plant was 1.500 tons/day, but the treatment capacity was reduced to 500 tons/day after the new process transformation, which just met the existing demand.

Due to the demolition of the industrial park along the Yangtze River, a residential area under construction will soon be built in the town, and the sewage treatment capacity will increase. But the left side of the treatment plant is farmland, and the right side is school building, so there is no room for expansion.

What is even more embarrassing is that Jiangling County has been expanding in recent years, and Hexiong Town is only about 2 kilometers away from the main sewage pipe network in the new district of the county. Jiangling county Housing and Construction Bureau initially envisaged that in the future, the town pipe network and the county pipe network would be connected, and the sewage would be handed over to the county sewage treatment plant for treatment. "The treatment scale of the county sewage treatment plant has reached10.9 million tons/day, and the sewage in Hexiong Town is not a problem at all." The relevant person in charge of the County Housing and Construction Bureau said.

By then, the sewage in Hexiong Town will have a place to go. However, the processing plants that spend huge sums of money on construction, renovation and transformation are facing "laid-off".

According to local conditions, achieve global coverage.

Venue: Liangzihu District, Ezhou City

Some small sewage treatment stations can be seen in some villages in Liangzihu District of Ezhou.

For example, Xiazhongwan, Mao Qi Village, Rudong Town, adopts the technology of "unpowered rapid sedimentation anaerobic integrated reactor+constructed wetland", which can treat sewage 10 tons per day and cost 50,000 yuan.

In Zhou Hu Beach Bay, Hupiao Village, Zhaoshan Town, the "multi-layer microbial filter process" was adopted, and the sewage treatment cost per ton was only about 0. 1 yuan, and the effluent index reached the first-class A standard.

These treatment stations are invested and constructed by Hubei Lianjing Water Investment Co., Ltd., and the whole plant and the whole network are integrated. The government of Liangzihu District granted the company a 30-year franchise and paid the service fee of sewage pipe network year by year.

They are all sewage treatment stations. Why are the processes used different? The relevant person in charge of the company explained: "Each sewage treatment station covers different villages and bays, and the main components of sewage are different. It is necessary to adapt to local conditions and be targeted. "

Since 20 14, Ezhou has taken the lead in proposing and starting the construction of an integrated and full-coverage system for urban and rural sewage collection and treatment. At present, eight urban sewage treatment plants have been put into operation or trial operation in the city, and more than 400 sewage treatment facilities have been built in rural areas. A "four-in-one" sewage treatment system covering the whole city, new district, market town and village bay was initially formed.

"With the continuous development of economy and society, the main components of domestic sewage in towns and villages have also changed, and it is impossible to conquer the world with a set of equipment. The construction of sewage treatment facilities in rural areas must be adapted to local conditions, with both technical means and technical strength in maintenance. " The person in charge said.

Ezhou Housing and Construction Bureau introduced that this year, the city will build 15 urban sewage treatment plant and117 rural natural bay sewage treatment device to ensure that the rural sewage treatment rate reaches over 80%.