Wilo's perfect pump system
Population, Energy, Impurities, Water Consumption - These factors continue to cause serious technical problems in municipal sewage pumping stations. How to cope with the challenges brought by the vagaries of the sewage market and reduce the operational cost of the sewage pump in the life cycle has become more and more The more professionals are concerned about the topic.
At IFAT 2016, the world's leading trade fair in Munich, Germany, Mario Hübner, systems engineer for wastewater treatment at Wilo Europe AG (WILO SE), based on his more than 40 years of expertise, is focusing on how Europe can reduce the life of a sewage pump Operating costs, how to troubleshoot easily blocked pump station put forward a professional opinion, for the current sewage treatment in China have a certain reference.
Mario Hübner, Systems Engineer, Wastewater Treatment, Ville Group
First of all, I would like to ask you, Mario Hübner, what are the challenges of municipal sewage treatment now and in the future?
Mario Hübner: "In general, the two conflicting developments will lead to a growing number of problems. First, for ecological reasons, German families are drastically saving water. The result of vigorous water conservation is the presence of impurities in wastewater However, most of Germany's pipelines were completed in the first few years after World War II. At present, most of the pressure on sewage pipelines can no longer withstand the increasing pollution load.
For example, like our daily wet wipes, many people throw the wet wipes in the toilet instead of in the trash. As a result, many problems in wastewater treatment can result. "
What are the problems caused by wipes in these effluents?
Mario Hübner: "Nowadays a very popular wet wipe, made of nonwovens, is very strong, and these nonwovens do not dissolve in water as compared to traditional toilet paper, on the contrary, they form long ribbon wraps Another serious issue is that nonwovens can absorb oil and people are increasingly flushing leftover food or frying oil into the toilet, resulting in nonwovens It is easy to combine with grease, and their mixture quickly forms huge plugs and clogs pipes.
Solid impurities clogged pipe site photos
Can you describe the severity of the problem?
Mario Hübner: "Roughly speaking, the proportion of impurities in sewage water has increased to about 2 kg per person per year in the past few years, and now more people are encouraged to save water, resulting in a decrease in water consumption by users. In addition, more and more Rainwater is also collected in rainwater storage tanks and used after water is filled in closed areas, although this is not wrong from an ecological point of view, there is a lack of 'transport water' in sewer systems, Concentration will continue to rise.
This leads to expensive costs as many of the wastewater treatment plant technicians report that they were summoned two or three times a month due to a blockage of the pump every month and are now called two or three times a week! "
This will of course lead to an increase in the cost of sewage treatment. What are the possible technical solutions?
Mario Hübner: "Two-pole motors are usually better than four-pole motors for efficient delivery of sewage containing high levels of solid impurities, high speed pumps and less volume of water, so in some cases an effective solution is to use impellers A smaller two-pole pump replaces a four-pole motor with a larger impeller diameter.Whatever the most efficient pump operating point, it sometimes makes sense to simply increase the motor speed.When you start the pump, in particular, you have to make the high concentration Of the sewage mixture is quickly drawn into the impeller and promptly removed.Another solution is to use guide plates to reduce the air entering the effluent during drainage of the pump chamber or to adjust the pump ON / OFF level switch according to the amount of influent in wet and dry weather.
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