Reed water plant "practice" short process water purification process

Transferred from "China Water Network"

 

From the sensational Wuxi water crisis to the boiling Yancheng water pollution, the safety of water supply and water quality has affected the sensitive nerves of hundreds of millions of people. The new "Sanitary Standard for Drinking Water" will be implemented in 2012, and the "hard indicators" of 106 drinking water quality are making the articles on raw water purification more and more.

 

Short process water purification process from pilot to cross engineering application

 

Previously, both domestic and foreign, the development of water purification technology has long been plagued by a long process cycle, complex process, high energy consumption, and a large footprint. Membrane products that are recognized as “first-class heroes” for water quality have not been widely used due to the high cost.

 

On January 6, 2009, after the well-known experts such as Academician Li Guibai of Harbin Institute of Technology and other famous experts, the “short-flow water purification process with immersion ultrafiltration membrane technology as the core” broke through the original bottleneck and became clean water. A milestone in the development of technology in the field.

 

According to Mr. He Shouping, General Technical Consultant of the “Short Process Water Purification Process with Immersion Ultrafiltration Membrane Technology as the Core”, this topic is the basis of the PVC alloy ultrafiltration membrane successfully developed by Lisheng Water Purification Technology Co., Ltd. for many years. In the past, through the joint research of Pacific Water Treatment Engineering Co., Ltd. and Nantong Water Supply Company, the results of the phased pilot test were obtained. The pilot research process of this subject was strongly supported by leaders such as Gu Yuren, general manager of Nantong Water Supply Company.

 

The result proposes a short process technology with immersion ultrafiltration membrane technology as the core, integrating flocculation, ultrafiltration and sludge concentration; this technology highlights the concept of low transmembrane pressure difference and low flux, making full use of the water plant The original working water head adopts the operation mode of the membrane separation unit to reduce the membrane pollution, the system runs stably, the effluent turbidity is lower than 0.02 NTU, and the biosafety is greatly improved; the process saves land, saves investment, and transforms the old water plant and The new water plant has provided a new technical route, which is in line with the development direction of resource-saving industrialization and has broad market application prospects.

 

On March 4, Shen Guoxian, chairman of Pacific Water Treatment Engineering Co., Ltd., revealed in an interview with China Water Net. The reed water plant under the Nantong Water Supply Company has signed a short process net with the core of immersion ultrafiltration membrane technology. The “Water Process” project pilot will witness the important process of the process from the pilot to the specific project application. It is understood that in the second half of this year, the reed water plant after the process transformation will be identified. “Only the process that is truly certified by the project will have more promotion value!” Shen Guoxian said with great certainty.

 

"Three magic weapons" reduce process costs

 

The birth of the new process is really gratifying, but the cost issue of whether it can be promoted on a large scale is more concerned.

 

It is understood that Nantong, like many cities, is facing an embarrassing situation in which old water plants are in urgent need of renovation and people are sensitive to water charges.

 

When it comes to the application of the "dip-flow ultrafiltration membrane technology as the core of the short-flow water purification process" in the reed water plant, Shen Guoxian's wrinkled double eyebrows instantly stretched out and revealed a shallow smile: "Apply the process Through comprehensive means, it is possible to achieve a reduction in construction costs and a relative reduction in operating costs." Shen Guoxian said, "If the transformation of the water purification process originally required an increase of one kilogram of operating costs, it is now only necessary to increase by six points."

 

What has achieved a significant cost reduction?

 

One magic weapon is a short process design that achieves a reduction in construction costs. The design of the short process is catering to the current situation of land shortage in Nantong. The land is saved and the cost is reduced. Shen Guoxian introduced that the so-called short process means that the membrane is placed directly in the sedimentation tank, and the water from the membrane directly enters the clear water tank, and through experimental research, the water quality has reached the standard. The filter was pushed to the "waiting seat." “The filter tank can make the water purification process run normally according to the normal process when the membrane is not in normal use.” Shen Guoxian said.

 

The second magic weapon is the use of curtain film in this process. The cost of the curtain film is the lowest compared to the column film and the plate film generally used, and the investment cost can be relatively reduced.

 

The reduction of operating costs is achieved through advanced technical means. “When the temperature is moderate, the tap water flows through the membrane through its own gravity, thus reducing energy consumption; only when the temperature is low and the membrane flux is relatively reduced, the pressurization is initiated, so that the membrane flux reaches the normal standard. The reduction in operating costs," Shen Guoxian explained.

 

How does the process transformation respond to micro-polluted water sources and sudden changes in water quality?

 

At the same time as the pilot test results of the short-flow water purification process with immersion ultrafiltration membrane technology as the core, the experts also proposed to further study the ultrafiltration pretreatment technology under micro-polluted water source conditions and the emergency of water quality accidents. Two suggestions for processing technology.

 

So, what should be done during the process of reeding the reed water plant?

 

First of all, for the problem of micro-polluting of water sources, Shen Guoxian said that many surface waters have micro-polluting problems, which are mainly caused by climate change and water pollution. At present, for the transformation of “short-flow water purification technology with immersion ultrafiltration membrane technology as the core”, Shen Guoxian introduced a new concept to the reporter with a little mystery: “We are studying if the sewage treatment is one level B upgraded to the technology in the first-level A transformation, which in turn was applied to the front end of the water treatment process."

 

When talking about dealing with sudden water quality accidents, Shen Guoxian said that the focus will be on the study of the backup system: "In the case where the membrane cannot be used, it is very important to add other technical measures to achieve safe and stable operation of the water supply system."

 

Editor's note: The development and practice of any new technology and new technology is hard and long. The application of any concept needs to be adapted to local conditions and needs to keep pace with the times. While we are delighted with the emergence of new ideas, we must not rush to seek success, and we should continue to conduct argumentation and experimentation step by step. Just as Shen Guoxian always emphasized in the interview: "Since it is necessary to promote technology, it must be stable and reliable. The waterworks is related to the safety of the people's drinking water, and must not fish for two days in three days."