Ningbo's first class four effluent standard sewage treatment plant is commissioned to serve

The first sewage treatment plant in Ningbo, Xinzhou Sewage Treatment Plant, was formally commissioned and became the first "top" sewage treatment plant in Ningbo.

It is understood that the total investment of the project is 256 million yuan, mainly from the original 160,000 tons of sewage treatment after the water quality from the first class B across the first class A, directly jumped to the current leading four categories of water standards, effluent discharged to the Yongjiang River.

Reporters on the scene to see, the staff collected two bottles of water samples, one bottle is the first-class B treatment process after the water sample, the other bottle is the implementation of the four types of water samples after the bid. Through the glass bottle, two bottles of water are colorless, odorless and transparent liquid, from the naked eye it is almost difficult to see the difference.

New week sewage treatment plant related personnel said: the naked eye seems to be the same situation, in fact, there are many articles, the most important thing is that the removal rate of pollutants inside has been greatly improved. Water quality improvement is not a problem of multiple purification, but the whole purification process will change, which requires a lot of money. Just like a high jump competition, every professional athlete raises 1 centimeters. The additional capital of Xinzhou Sewage Treatment Plant is 256 million yuan, equivalent to about 50% of the total investment cost of the plant in 2010. Where is the secret to improve the effluent quality?

It is also reported that the water quality requirements of the four types of water standards have been greatly improved from the first class B to the fourth class. On the basis of the original low value, the further removal of such a large scale has put forward very high requirements for the process and operation. For this reason, three new links have been added to the new week sewage treatment plant in this bid-raising transformation. The technology of "high technology" in sewage treatment - "MBBR (moving bed membrane bioreactor) + high efficiency sedimentation tank + denitrifying deep bed filter" was studied.

It is understood that the MBBR process is a modification of the biological reaction tank of the core unit of the sewage treatment plant. By adding about 3 cm diameter and honeycomb-like filler on the surface of the tank, the activated sludge can adhere to the surface of the filler, increase the contact area with the sewage, and greatly enhance the degradability of chemical oxygen demand, ammonia nitrogen and other indicators. The high-efficiency sedimentation tank and denitrification deep bed filter are the new advanced treatment units in the upgrading. The high-efficiency sedimentation tank can be regarded as the "upgrade" of the secondary sedimentation tank. By adding coagulants and flocculants, the sewage can be precipitated again, and the suspended particles can be further removed, and the suspended solids and total phosphorus can be reduced. Compared with other sedimentation tanks, the efficient sedimentation tank has the advantages of small footprint, high efficiency and high hydraulic loading. De-nitrification deep bed filter is composed of rectangular treatment units. Each treatment unit has six layers of cobblestone and quartz sand layered at the bottom. It plays a role of mechanical filtration and physical adsorption. It is like a "water purifier" used at home. It can remove suspended solids in water and reduce nitrogen, phosphorus and other pollutants. In addition, the deep bed filter can further remove the total nitrogen in the water through the "denitrifying bacteria" in the pond.

Xinzhou Sewage Treatment Plant upgraded the effluent quality standard to four categories of water. This water will not only make the Yongjiang River "drink" high-quality water, effectively reduce the total amount of pollutants discharged into the river, but also be used as environmental water, ecological water supplement for the construction of Xiaogang Binjiang New Town, and even as a supplementary water source for the surrounding industrial water. To realize the recycling of water resources and form a green economic circle.

At the end of June, after commissioning, Xinzhou Sewage Treatment Plant can produce 160,000 tons of high-quality water a day, nearly 60 million tons a year down, equivalent to 200 months of Lake water. In addition, the renovation project of the sewage treatment plant in the northeast of the Yangtze River according to the four types of water effluent standards is progressing smoothly and is expected to be completed by the end of 2019.

At the same time, the reporter also learned that in the three years after the 13th Five-Year Plan, the Municipal Water Supply and Drainage Group will continue to work hard to build the third phase of Ningbo North District Sewage Treatment Plant and the sea drainage pipeline project, the second phase of Xinzhou Sewage Treatment Plant, the first phase of Yinxi Sewage Treatment Plant tender raising and expansion project, the investment will exceed 1.5 billion yuan, and continue to promote high-quality sewage. Dealing with career development.