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À̸§ °ü¸®ÀÚ waterindustry@hanmail.net ÀÛ¼ºÀÏ 2019.07.16 Á¶È¸¼ö 611
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¿þ½ºÆ® ¹öÁö´Ï¾Æ ´ëÇÐ Åä¸ñ ¹× ȯ°æ°øÇаú ·£½º ¸°(Lance Lin) ±³¼ö ¿¬±¸ÆÀÀº ¹° Àç»ç¿ëÀ» ±Ø´ëÈ­ÇÏ°í ¿­Àü ¹ßÀüÀ¸·Î ÀÎÇÑ È­ÇÐ ¹× ¿¡³ÊÁö ¹ßÀÚ±¹(chemical and energy footprints)À» ÁÙÀÌ´Â °ÍÀ» ¸ñÇ¥·Î »ï°í ÀÖ´Ù.


·£½º ¸°(Lance Lin) ±³¼ö´Â "´ã¼ö¿¡ ´ëÇÑ °æÀï ¿ä±¸°¡ ÀÖ´Ù. ¿ì¸®´Â ¾çÁ¶, Á¦Á¶ ¹× ³ó¾÷À» À§ÇØ °¡Á¤¿¡¼­ »ç¿ëÇÑ´Ù. Àü±¹ÀûÀ¸·Î Àü·Â»ý»êÀº ¹° »ç¿ë·®¿¡¼­ 2À§¸¦ Â÷ÁöÇϸç, ½Ä·® »ý»ê·®º¸´Ù µÚóÁø´Ù. ±×·¯³ª ¿þ½ºÆ® ¹öÁö´Ï¾Æ¿¡¼­´Â Àü·Â»ý»ê·®ÀÌ °¡Àå Å« ¹° »ç¿ëÀÚÀÌ´Ù. ¿ì¸®°¡ ¹ßÀü¼Ò¿¡¼­ »ç¿ëÇÏ´Â ¹°·®À» ÁÙÀÌ¸é °æÀï ¼ö¿ä¸¦ ÁÙÀÏ ¼ö ÀÖ´Ù"°í °­Á¶ÇÑ´Ù.


È­·Â¹ßÀü¼Ò¿¡¼­ ¹°Àº ¿­±³È¯±âÀÇ Åͺ󿡼­ °í¿Â Áõ±â¸¦ ³Ã°¢½ÃÅ°´Â µ¥ »ç¿ëµÈ´Ù. µû¶æÇÑ ¹°Àº ´ë±â·Î ¿­À» ¹æÃâÇϱâ À§ÇØ ³Ã°¢Å¾À¸·Î ¼øȯµÈ´Ù. ÀÏ´Ü ³Ã°¢Å¾¿¡ ¹°ÀÌ ´êÀ¸¸é, ±× Áß ÀϺδ Ÿ¿ö¿¡¼­ ½ñ¾ÆÁ® ³ª¿À´Â ÇÏ¾á ±êÅзΠº¼ ¼ö ÀÖµíÀÌ °ø±â ÁßÀ¸·Î Áõ¹ßÇÑ´Ù.


±×·¯³ª ¸ðµç ¹°ÀÌ ¼Õ½ÇµÇ´Â °ÍÀº ¾Æ´Ï´Ù. ÀϺδ À¯ÁöµÇ°í ½Ã½ºÅÛÀ» ÅëÇØ Àç¼øȯµÈ´Ù. ¹°ÀÌ ¾ø¾îÁö¸é ¹° ¼Ó¿¡ Àִ õ¿¬ ¼Ò±ÝÀº ³Ã°¢ ½Ã½ºÅÛÀ» ¿À¿°½Ãų ¼ö ÀÖ´Â ³óµµ¿¡ µµ´ÞÇÑ´Ù. ±×·¡¼­ ÀÌ °øÀåÀº Ä®½·°ú ¸¶±×³×½·°ú °°Àº ¿­±³È¯±â Ç¥¸é¿¡ ½ºÄÉÀÏÀ» Çü¼ºÇÏ¿© ¿­±³È¯ È¿°ú¿¡ ¿µÇâÀ» ¹ÌÄ¡´Â È­Çй°Áú·Î °¡µæ ÂùÀÌ 'ºí·Î¿ì ´Ù¿î ¿öÅÍ(blowdown water)'¸¦ Á¦°ÅÇÑ´Ù.  ¹èÃâµÈ ¹°Àº ȯ°æÀ¸·Î ´Ù½Ã ¹æÃâµÇ°Å³ª Àç»ç¿ëµÇ±â Àü¿¡ 󸮵ǰųª û¼ÒµÇ¾î¾ß ÇÑ´Ù.


·£½º ¸°(Lance Lin) ±³¼ö´Â "È­ÇÐÀû ¹× ¿¡³ÊÁö ¿ä±¸ ¶§¹®¿¡ 󸮺ñ¿ëÀÌ ºñ½Î´Ù"°í ¸»ÇÑ´Ù.


±×·¯³ª ·£½º ¸° ±³¼öÀÇ µ¿·áÀÎ Æú Áö¿¥Å°¿¡ºñÄ¡(Paul Ziemkiewicz)´Â ¿þ½ºÆ® ¹öÁö´Ï¾Æ ´ëÇÐ ¹°¿¬±¸¼Ò(WVU Water Research Institute)ÀÇ ÀÌ»ç·Î µÎ °¡Áö µ¶Æ¯ÇÑ ¼Ö·ç¼ÇÀ» Á¦¾ÈÇß´Ù. È¿À²¼ºÀ» ³ôÀ̱â À§ÇØ ¸¶¼¿·¯½º(Marcellus) °¡½ºÁ¤¿¡¼­ ¹ß»ýÇÑ '»ý¼ºµÈ ¹°'°ú 'ºí·Î¿ì ´Ù¿î ¿öÅÍ(blowdown water)'À» Çѹø °áÇÕÇغ¸ÀÚ.


'»ý»êµÈ ¹° (Produced water)'À̶õ °¡½º¿Í ¼®À¯»ê¾÷¿¡¼­ ¼®À¯¿Í °¡½º¿¡ ¼ö¹ÝµÇ´Â ¹°À» ³ªÅ¸³»´Â ¿ë¾îÀÌ´Ù. »ý¼ºµÈ ¹°À» 'ºí·Î¿ì ´Ù¿î ¿öÅÍ(blowdown water)'¿¡ ´õÇÔÀ¸·Î½á Àç»ç¿ëÀÌ °¡´ÉÇÒ Á¤µµÀÇ ±ú²ýÇÑ ¹°À» ¾òÀ» ¼ö ÀÖ´Ù.


Æú Áö¿¥Å°¿¡ºñÄ¡(Paul Ziemkiewicz)´Â ¹ßÀü¼Ò Æó¼ö ¹× »ý»êµÈ ¹°°ú ÇÔ²² ÀÛ¾÷À» ÇÑ´Ù"¶ó¸é¼­ "'ºí·Î¿ì ´Ù¿î ¿öÅÍ'ÀÇ ¿ä¼Ò´Â »ý»êµÈ ¹°¿¡¼­ ½ºÄÉÀϸµ ¿ä¼Ò¸¦ Á¦°ÅÇϱâ À§ÇØ »ê¾÷°è¿¡¼­ »ç¿ëÇÏ´Â ¿ä¼ÒÀÌ´Ù. ÀÌ°ÍÀº ÇöÀç »ó¾÷¿ë È­Çй°ÁúÀ» »ç±âº¸´Ù´Â Æó±â¹°À» »ç¿ëÇϱ⠶§¹®¿¡ »ý»ê¼öÀÇ Ã³¸® ¶Ç´Â Àç»ç¿ëÀ» ÈξÀ Àú·ÅÇÏ°Ô ¸¸µé ¼ö ÀÖ´Ù. ±×¸®°í ¿ì¸® ¹ßÀü¼Ò°¡ ¸¶¼¿·¯½º(Marcellus) °¡½ºÁ¤ÀÇ ½ÉÀåºÎ¿¡ À§Ä¡ÇÏ´Â µ¥ µµ¿òÀÌ µÈ´Ù"¶ó°í ¸»Çß´Ù.


Á¦¾ÈµÈ 󸮰úÁ¤Àº ¿¬È­, À¯±â¹° ¹× ºÎÀ¯ °íÇü¹° Á¦°Å, ¿ª»ïÅõ, ¿°¼ö Àü±âºÐÇØ ¹× ¿­´ã¼öÈ­·Î ±¸¼ºµÈ´Ù.


Àç»ç¿ë °¡´ÉÇÑ ¹° ÀÌ¿Ü¿¡, ó¸® °úÁ¤Àº ¿°¼Ò¿Í 10ÆÄ¿îµå ¿°¼öÀÇ µÎ °¡Áö ´Ù¸¥ Á¦Ç°À» »ý»êÇÏ´Â µ¥ µµ¿òÀÌ µÈ´Ù. ¿°¼Ò´Â Àç¼øȯ ½Ã½ºÅÛ¿¡¼­ ¼Òµ¶Á¦·Î ÀÛ¿ëÇÏ¿© Àç¼øȯ ½Ã½ºÅÛÀÇ ¹ÚÅ׸®¾Æ ¼ºÀåÀ» Á¦¾îÇÒ °ÍÀ̶ó°í ·£½º ¸°(Lance Lin) ±³¼ö´Â ¸»ÇÑ´Ù.


ÇÑÆí, 10ÆÄ¿îµå ¼Ò±Ý¹°Àº ÆǸŰ¡´ÉÇÑ Á¦Ç°À¸·Î¼­ »ó¾÷Àû °¡Ä¡°¡ ÀÖ´Ù. ¹°ÀÌ ¿°È­³ªÆ®·ýÀ¸·Î Æ÷È­µÇ¸é, ±× ¿ë¾× 1°¶·ÐÀÇ ¹«°ÔÀÎ ¿°¼ö´Â 10ÆÄ¿îµåÀÌ´Ù. ÀÌ´Â ¿¬¼ö±â ¹× À¯Àü À¯Ã¼¿Í °°Àº »ê¾÷¿ë ¾îÇø®ÄÉÀ̼ǿ¡ »ç¿ëµÉ ¼ö ÀÖ´Ù.


·£½º ¸°(Lance Lin) ±³¼ö´Â "¿ì¸®ÀÇ ÇÁ·Î¼¼½º¿¡´Â ¿©·¯ °¡Áö ÀÌÁ¡ÀÌ ÀÖ."¶ó¸é¼­ "±âº» Ä¡·á¹ý¿¡ ºñ ÇØÀÌ Á¢±Ù¹ýÀº ¿¡³ÊÁö¿Í È­Çй°ÁúÀ» Àý¾à ÇÒ ¼ö ÀÖ´Ù"¶ó°í ¸»Çß´Ù.


¿¬±¸ÆÀÀº Çкλý ¹× ´ëÇпø»ýÀÌ µµ¿òÀ» ¹ÞÀ» ¼ö ÀÖµµ·Ï ¸ÞÀÌÁîºô(Maidsville) ±ÙóÀÇ ·Õºä(Longview) ¹ßÀü¼Ò¿¡¼­ ¹°À» ¸ðÀ¸°í, ¸ð°ÇŸ¿î °ø¾÷´ÜÁö(Morgantown Industrial Park)¿¡¼­ ¼ÎÀÏ °¡½º ¿îÀü¿¡¼­ ½ÇÁ¦ »ý»êµÈ ¹°À» »ç¿ëÇÑ´Ù.


·£½º ¸°(Lance Lin) ±³¼ö´Â "¿ì¸®´Â ÁøÂ¥ ¹°À» »ç¿ëÇÏ°í ÀÖ´Ù. ±×°ÍÀº ¿ì¸®°¡ ½ÇÇè½Ç¿¡¼­ ±¸¼ºÇÏ°í ÀÖ´Â °ÍÀÌ ¾Æ´Ï´Ù"¶ó°í ¸»Çß´Ù.


ÀÌ ÇÁ·ÎÁ§Æ®´Â 2030³â±îÁö ¾ÈÀüÇÏ°í Àú·ÅÇÑ ¹°À» ÇÊ¿ä·Î ÇÏ´Â ¼¼°èÀûÀÎ ¿ä±¸¸¦ ÇØ°áÇϱâ À§ÇÑ ¹é¾Ç°üÀÇ °èȹÀÎ DOE(¹Ì±¹ ¿¡³ÊÁöºÎ)ÀÇ ¿öÅÍ ½ÃÅ©¸´Æ® ±×·£µå 縰Áö(Water Security Grand Challenge)¸¦ Àü·Â »ê¾÷ÀÌ ÃæÁ·Çϵµ·Ï µ½±â À§ÇÑ °ÍÀÌ´Ù.


ÀÌ µµÀüÀÇ ¸ñÇ¥ Áß µÎ °¡Áö´Â ¿¡³ÊÁö ºÎ¹®ÀÇ »ý»ê¼ö¸¦ Æó±â¹°¿¡¼­ ÀÚ¿øÀ¸·Î ÀüȯÇÏ´Â °Í°ú ¿­Àü ¹ßÀü¼ÒÀÇ ´ã¼ö »ç¿ëÀ» ÁÙÀÌ´Â °ÍÀÌ´Ù.


ÀÌ ÇÁ·ÎÁ§Æ®ÀÇ ´Ù¸¥ ¿¬±¸ÀÚµé·Î´Â È­Çаú ¸í¿¹±³¼öÀÎ Çظ® ÇÉŬ¶ó(Harry Finklea), ±â°èÇ×°ø°øÇкΠºÎ±³¼öÀÎ ÇÏÀϸ° ¸®( Hailin Li), È­ÇаøÇкΠÁ¶±³¼öÀÎ Æ丣³­µµ ¸®¸¶(Fernando Lima) µîÀÌ ÀÖ´Ù.

 


[¿ø¹®º¸±â]


WVU Researchers Thirsty For Reducing Fresh Water Use By Power Plants

 


Power plants across the country utilize more than four times as much water as all U.S. homes and account for 41 percent of total water withdrawals, according to federal data.


Now, with the aid of a $400,000-Department of Energy grant, West Virginia University researchers are seeking ways to quench the thirst of the nation¡¯s power plants in a more cost-effective, environmentally-friendly fashion.


Led by civil and environmental engineering professor Lance Lin, the research team aims to maximize water reuse and reduce chemical and energy footprints resulting from thermoelectric generation.


¡°There are competing demands for fresh water,¡± Lin said. ¡°We use it in our homes, for drinking, manufacturing and agriculture. Nationally, power generation is second in water use, only behind food production. But in West Virginia power generation is by far the largest water user. If we can cut down on the volume used by power plants, that lessens some of those competing demands.¡±


At thermoelectric power plants, water is used to cool down high-temperature steam from turbines in a heat exchanger. The warm water is circulated to cooling towers to eject the heat into the atmosphere. Once the water hits the cooling tower, some of it evaporates into the air, as can be seen by white plumes pouring out of the towers.


But not all of the water is lost. Some is retained and recirculates through the system. As water is lost, the natural salts in the water reach concentrations where they could foul the cooling system. So the plant purges this ¡®blowdown water,¡¯ rife with chemicals such as calcium and magnesium that form scale on the heat exchanger surfaces, affecting heat exchange effectiveness.


Blowdown water needs to be treated, or cleaned, before it can be released back into the environment or reused.


The treatment is costly because of its chemical and energy requirements, Lin said.


But Lin¡¯s colleague, Paul Ziemkiewicz, director of WVU¡¯s Water Research Institute, proposed a unique solution that is twofold: Combine the blowdown water with ¡°produced water¡± from Marcellus gas wells for more efficiency.


¡°Produced water¡± is a term in the gas and oil industry that describes the water that accompanies oil and gas.


By adding produced water to blowdown water, you get water that is clean enough to reuse, believe it or not, Lin said.


Ziemkiewicz works with both power plant waste water and produced water.


¡°The elements in blowdown water are exactly what the industry uses to remove scaling elements in produced water,¡± he said. ¡°This could make treatment or reuse of produced water much less expensive because you¡¯re now using a waste product rather than buying commercial chemicals. And it helps that our power plants are located in the heart of the Marcellus gas play.¡±


The proposed treatment process consists of softening, organics and suspended solids removal, reverse osmosis, brine electrolysis and thermal desalination.


In addition to the reusable water, the treatment process will help produce two other products, chlorine and 10-pound brine. The chlorine will act as a disinfectant on the recirculating water and control bacterial growth in the recirculation system, Lin said.


The 10-pound brine, meanwhile, has commercial value as a saleable product. When water is saturated with sodium chloride, the weight of one gallon of that solution, brine, is 10 pounds. It can be used in industrial applications including water softening and oilfield fluids.


¡°Our process has multiple benefits,¡± Lin said. ¡°Compared to the baseline treatment, this approach can generate energy and chemical savings.¡±


The research team, which will have undergraduate and graduate students assisting, will collect water from Longview Power Plant near Maidsville and use real produced water from a shale gas operation at the Morgantown Industrial Park.


¡°We¡¯re using real water,¡± Lin said. ¡°It¡¯s not something we¡¯re making up in a lab.¡±


The project is intended to help the power industry meet the DOE¡¯s Water Security Grand Challenge, a White House initiative to address the global need for safe, secure and affordable water by 2030. Two of the challenge¡¯s goals include transforming the energy sector¡¯s produced water from a waste to a resource and lowering fresh water use in thermoelectric power plants.


Other researchers on the project include Harry Finklea, professor emeritus of chemistry; Hailin Li, associate professor of mechanical and aerospace engineering; and Fernando Lima, assistant professor of chemical engineering.


[Ãâó=¿öÅͿ¶óÀÎ(https://www.wateronline.com/doc/wvu-researchers-thirsty-reducing-fresh-water-use-power-plants-0001)/ 2019³â 7¿ù 10ÀÏ]

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