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[2019] [¿µ±¹] ¿þ¼½½º ¿öÅÍ, ¹° ÀçÈ°¿ë ½Ã¼³ °øÁ¤°³¼±À¸·Î 75% Àý°¨
À̸§ °ü¸®ÀÚ waterindustry@hanmail.net ÀÛ¼ºÀÏ 2019.04.29 Á¶È¸¼ö 450
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[¿µ±¹] ¿þ¼½½º ¿öÅÍ,  ¹° ÀçÈ°¿ë ½Ã¼³ °øÁ¤°³¼±À¸·Î 75% Àý°¨

 


¿µ±¹ À×±Û·£µå ³²¼­ºÎ µµ½Ë(Dorset)¿¡ ÀÖ´Â ¼Å¹ø(Sherborne) ¸¶À»ÀÇ Àα¸ Áõ°¡´Â ¿þ¼½½º ¿öÅÍ(Wessex Water)°¡ ¼ÒÀ¯ÇÏ°í ¿î¿µÇÏ´Â ³óÃÌÁö¿ªÀÇ ¹° ÀçÈ°¿ë ½Ã¼³ÀÌ °úºÎÇϸ¦ °ü¸®Çϱâ À§ÇØ ¾÷±×·¹À̵尡 ÇÊ¿äÇÏ´Ù´Â °ÍÀ» ÀǹÌÇß´Ù. ´çÃÊ À¯Æ¿¸®Æ¼´Â Á÷°æ 30mÀÇ Æ®¸®Å¬¸µ ÇÊÅÍ(trickling filters)¸¦ 2¡­3°³ Ãß°¡·Î °Ç¼³ÇÒ °èȹÀ̾úÁö¸¸ÀÌ °³¹ß·Î ÀÎÇØ ÀÌ ±¹Åä°¡ Á¦ÇÑµÈ ºÎÁö¿¡ ¹®Á¦°¡ ¹ß»ýÇß´Ù.

 

´ë½Å À¯Æ¿¸®Æ¼´Â ´ëü ¼Ö·ç¼ÇÀ» ã°í ÀÖ¾úÀ¸¸ç ÇöÀå¿¡¼­ ±âÁ¸ÀÇ ¹ö·ÁÁø ±¸Á¶¸¦ È°¿ëÇÏ´Â ¹æ¹ý°ú °í¼Ó ÇÁ·Î¼¼½º¿¡ ´ëÇÑ Á¤º¸¸¦ ¾ò°í ÀÖ¾ú´Ù. Wessex WaterÀÇ ÇÁ·Î¼¼½º ¼³°è °ü¸®ÀÚ ÀÎ ¾Øµå·ç °É¸®Æ÷µå(Andrew Gulliford)´Â WPLÀÇ Çâ»óµÈ »ý¹°ÇÐÀû ó¸® °úÁ¤À» ¾÷°è °£Ç๰ÀÇ ±â»ç¸¦ ÅëÇØ È®ÀÎÇÏ°í ȸ»ç¸¦ ¼Å¹ø(Sherborne) ÇöÀå¿¡ ÃÊûÇß´Ù.

 

WPLÀÇ Hybrid-SAF Á¤¹Ð°øÇРó¸® ½Ã½ºÅÛÀÇ °¡Àå Å« ÀåÁ¡Àº ¸ð¾çÀ̳ª Å©±â¿¡ °ü°è¾øÀÌ ¸ðµç ¼±¹Ú¿¡ °³Á¶ÇÏ¿©º¸´Ù È¿À²ÀûÀÎ Æó¼ö 󸮸¦ Á¦°ø ÇÒ ¼ö ÀÖ´Ù´Â °ÍÀÌ´Ù. ÇÁ·ÎÁ§Æ®ÀÇ Ãʱâ Çù¾÷ °èȹ ´Ü°è¿¡¼­ ¹ö·ÁÁø 12m Á÷°æÀÇ ÇöÀå ½½·¯Áö ÅÊÅ©ÀÇ ¿ëµµ º¯°æ °¡´É¼ºÀÌ È®ÀεǾú´Ù.

 

ÇÔ²² ÆÄÆ®³ÊµéÀº °èȹµÈ ÇÁ·ÎÁ§Æ®ÀÇ ´ë¾ÈÀ¸·Î ±âÁ¸ ÀÎÇÁ¶ó¿¡ WPLÀÇ ±â¼úÀ» Ãß°¡ÇÔÀ¸·Î½á ÀÚº» ÁöÃâ¿¡¼­ 75%ÀÇ ÀáÀçÀû ºñ¿ë Àý°¨À» ´Þ¼ºÇÒ ¼ö ÀÖ´Ù°í °è»êÇß´Ù. WPLÀÇ Hybrid-SAF ±â¼úÀº ¼öÁß À̵¿Ãþ, °íÁ¤ Çʸ§ ¹ÝÀÀ±â·Î ±¸¼ºµÇ¸ç ±âÁ¸ÀÇ Ä§¼öÇü Æø±â ÇÊÅÍ (SAF)º¸´Ù ´õ Áö¼Ó °¡´ÉÇÏ°í ºñ¿ë È¿À²ÀûÀÎ ¹æ½ÄÀ¸·Î Æó¼ö¸¦ ó¸®ÇÒ ¼ö ÀÖ´Ù.

 

¡á ¿ë·® ¹è°¡(Doubling capacity)
¸ðµâ Çü WPL ÇÏÀ̺긮µå -SAF ¼¼Æ÷·Î ¿øÇü ¿ë±â¸¦ °³ÀåÇÏ¸é ¿ë±âÀÇ Àüü¸¦ È°¿ëÇÒ ¼ö ÀÖÀ¸¸ç ÀÛÇ°ÀÇ Àüü È帧 ó¸®ÀÇ 50%¸¦ 2Â÷ »ý¹°ÇÐÀû 󸮷ΠÁ¦°øÇÒ ¼ö ÀÖ´Ù. °øÁ¤ ¿ë·®À» µÎ ¹è·Î ´Ã¸²À¸·Î½á °èȹµÈ »ì¼ö ¿©»ó ÇÊÅÍ¿¡ ´ëÇÑ ¿µ±¸ÀûÀÎ ´ë¾ÈÀÌ ¹àÇôÁ³À¸¸ç 20³âÀÇ ±â°£À» º¸¾ÒÀ» ¶§ »ó´çÈ÷ Àú·ÅÇß´Ù.

 

¸ðµâ½Ä °øÁ¤±â¼ú ¼¿ÀÇ ¿ÀÇÁ »çÀÌÆ® Á¦Á¶·Î ÀÎÇØ ÇöÀå¿¡¼­ÀÇ ÇÁ·ÎÁ§Æ® ³³Ç° ½Ã°£Àº »õ·Î¿î À¯ÀÔ±¸ ÇÊÅÍ¿¡ ÇÊ¿äÇÑ civils ÀÛ¾÷¿¡ ´ëÇØ °¡´ÉÇÑ 12°³¿ùÀÌ ¾Æ´Ñ ¸çÄ¥ÀÌ ¼Ò¿äµÇ¾ú´Ù.

 

WPLÀÇ ¾Øµå·ç º£¾îµå(Andrew Baird) ±â¼úÀÌ»ç´Â "WPLÀÇ Hybrid-SAF´Â ¹°¼Ó¿¡ Àá±ä »ý¹°ÇÐÀû 󸮸¦À§ÇÑ Áß¿äÇÑ ´Ü°èÀÌ´Ù. ¿ì¸® ¿¬±¸ °³¹ßÆÀÀº ³ôÀº ºñ Ç¥¸éÀû ¸Åü¸¦ »ç¿ëÇÏ¿© »õ·Î¿î ¹æ½ÄÀ¸·Î ±â¼úÀ» µÞ¹ÞħÇÏ´Â À¯Ã¼ ¿ªÇÐ ÇÁ·ÎÆÄÀÏÀ» °í¾ÈÇß´Ù"°í °­Á¶Çß´Ù.

 

¾Øµå·ç º£¾îµå(Andrew Baird) ±â¼úÀÌ»ç´Â À̾°á°úÀûÀ¸·Î ÇöÀåÀÇ Àü¹ÝÀûÀÎ °øÁ¤ ¿ë·®À» Áõ°¡½ÃÅ°°í ȯ°æ Áؼö¸¦ °³¼±ÇÏ´Â µ¿½Ã¿¡ ºñ¿ë, ¹°¸®Àû °ø°£ ¹× Àü·Â ¼Òºñ °¨¼Ò¸¦ ºñ·ÔÇÑ »ó´çÇÑ °øÁ¤ È¿À²¼º ÀÌÁ¡ÀÌ ´Þ¼ºµÇ¾ú´Ù"¶ó¸é¼­ "Wessex Water¿Í Çù·ÂÇÏ¿© Ãʱâ ÇÁ·ÎÁ§Æ®¿¡ Âü¿©ÇÔÀ¸·Î½á ÀÌ »çÀÌÆ®¸¦ À§ÇÑ ÃÖ»óÀÇ ¼Ö·ç¼ÇÀ» ¸Å¿ì ÀÏÂï È®ÀÎÇÒ ¼ö ÀÖ¾ú´Ù"¶ó°í ¸»Çß´Ù.

 

ù ¹ø° È帧Àº 2018³â 10¿ù 1ÀÏ¿¡ ½Ã½ºÅÛ¿¡ ÀԷµǰí ù ¹ø° µ¥ÀÌÅÍ´Â 10¿ù 30ÀÏ¿¡ ±â·ÏµÇ¾ú´Ù. °á°ú´Â ¾Ï¸ð´Ï¾Æ(NH3) ¼öÄ¡°¡ 0.4mg/L ÀÌÇÏ¿´À½À» ȯ°æûÀÌ ¿ä±¸ÇÏ´Â 10mg/LÀÇ µ¿ÀÇ ¹üÀ§ ³»¿¡¼­ Àß ³ªÅ¸³Â´Ù.

 

¡á ±ä¹ÐÇÑ Çù¾÷(Close collaboration)
ÇÁ·ÎÁ§Æ® Ãʱ⠴ܰ迡¼­ WPLÀº Ŭ¶óÀ̾ðÆ®ÀÇ ¸ñÀûÀ» ¿ÏÀüÈ÷ ÀÌÇØÇÒ ¼ö ÀÖ¾ú±â ¶§¹®¿¡ ÇöÀå¿¡¼­ ÇöÀå ¹æ¹®À» ÅëÇØ ÃÖÁ¾ »ç¿ëÀÚ¸¦ ¸¸³µ´Ù. »ý¹° Áö´ë¿¡ ¼³Ä¡µÈ ¹Ìµð¾î À¯Çü¿¡¼­ ³óÃÌ Áö¿ªÀ¸·ÎÀÇ Á¢±Ù Á¦ÇÑ ¹°·ù¿¡ À̸£±â±îÁö ¸ðµç °ÍÀ» Æ÷ÇÔÇÏ¿© ÇÁ·ÎÁ§Æ®ÀÇ Àüü ¹üÀ§°¡ ÃÖÀûÀÇ ¼Ö·ç¼ÇÀ» ¼³°èÇÏ´Â µ¥ °í·Á µÉ ¼ö ÀÖ´Ù.

 

Wessex Water´Â ¶ÇÇÑ ¹Ì·¡¸¦ º¸Àå¹ÞÀ» ¼ö ÀÖ´Â ¼Ö·ç¼ÇÀ» º¸ÀåÇÏ´Â WPL°ú ÇÔ²² 2040³â±îÁö µðÀÚÀΠȣÆòÀ» °øÀ¯Çß´Ù. ÀÌ À¯Æ¿¸®Æ¼´Â ÇöÀç Áý¼ö¿¡¼­ Àα¸°¡ 12,600¸í¿¡¼­ 15,700¸íÀ¸·Î Áõ°¡ÇÔ¿¡ µû¶ó Sherborne¿¡¼­ 󸮷®À» ´Ã¸± ¼ö ÀÖ´Â À¯¿¬¼ºÀÌ Çâ»óµÇ¾ú´Ù.

 

¸ðµâÇü WPL Hybrid-SAF ¼¼Æ÷´Â 6ÁÖ¿¡¼­ 8ÁÖ À̳»¿¡ Á¦Á¶µÇ¾úÀ¸¸ç, 2ÀÏ ³»¿¡ ¼³Ä¡µÇ¾úÀ¸¸ç 3ÁÖ À̳»¿¡ ÇÁ·Î¼¼½º°¡ ÃÖÀûÈ­µÇ¾ú´Ù. ¿ÀÇÁ»çÀÌÆ®(offsite) Á¦Á¶´Â ¶ÇÇÑ ÇöÀåÀÇ °Ç°­ ¹× ¾ÈÀü À§ÇèÀ» °¨¼Ò½ÃÅ°°í Ç°Áú °ü¸®¸¦ À¯ÁöÇϱ⠽±°Ô ¸¸µé¾ú´Ù.

 

¼³°è ´Ü°è¿¡¼­ Â÷·® ¹× °øÀåÀÇ ÇöÀå ¹× ÇöÀå Á¢±Ù¿¡ ´ëÇÑ ³ôÀÌ ¹× Æø Á¦ÇÑÀÌ °í·ÁµÇ¾ú´Ù.  ¿ÀÇÁ»çÀÌÆ®(offsite) Á¦ÀÛ°ú ÇÁ·ÎÁ§Æ® ½Ã°£ ´ÜÃàÀ¸·Î ÀÎÇØ Â÷·® ¿©ÇàÀÌ °¨¼ÒÇÏ¿© Áö¿ª»çȸÀÇ È¥¶õÀ» ÁÙÀÌ°í ź¼Ò ¹èÃâÀ» °¨¼Ò ½ÃÄ×´Ù.

 

¡á Áö¼Ó °¡´É¼º ÇýÅÃ(Sustainability benefits)
¼Åº»(Sherborne)ÀÇ »çÀÌÆ® ¼³Ä¡ ¸éÀûÀÌ 30% ´õ ÀÛ¾ÆÁö´Â °Íµµ ºñ½ÁÇÑ ¹æ¹ýÀ¸·Î ÁÙ¿©ÁÖ´Â ½Ä¹° ÀÚüÀÇ ¿¡³ÊÁö ¼Òºñ·®¿¡ ¹Ý¿µµÈ´Ù. °¡º¯ ¼Óµµ ¼Ûdz±â´Â ¼³°è ¿ä±¸»çÇ×ÀÇ 50¡­100%¸¦ Á¦°øÇϹǷΠÀü·Â ÃÖÀûÈ­¸¦ À§ÇÑ ´õ Å« ¿©À¯ °ø°£À» Á¦°øÇÑ´Ù.

 

ÀüÅëÀûÀÎ Ä¡·á ½Ã½ºÅÛº¸´Ù ´õ ³·Àº ¼öÁØÀÇ ¿î¿µÀÚ À¯Áö º¸¼ö°¡ ÇÊ¿äÇÏ¸ç °³º° ¼¼Æ÷´Â ¼­ºñ½º¿¡ ¿µÇâÀ» ¹ÌÄ¡Áö ¾Ê°í Ä¡·á ¿ë Ç÷°üÀ» ¿ÀÇÁ¶óÀÎÀ¸·Î ¿Å±âÁö ¾Ê°íµµ ¸î ½Ã°£¸¸¿¡ ±³Ã¼ ÇÒ ¼ö ÀÖ´Ù.

 

±âÁ¸ÀÇ °øÁ¤Ã³¸® ¿ë±â¸¦ ¹ö¸®°í ¸Å¸³ÇÒ ÇÊ¿ä°¡ ¾ø´Ù´Â °ÍÀ» ÀǹÌÇÏ´Â ÅÊÅ©ÀÇ ¿ëµµ º¯°æÀ» Æ÷ÇÔÇÏ´Â ´Ù¸¥ Áö¼Ó °¡´É¼º ÇýÅÃÀÌ ÀÖ´Ù. Àç»ç¿ëµÈ Á÷°æ 12mÀÇ ÅÊÅ©¸¦ ¶óÀÌ´×ÇÒ ¶§ ÃÖ¼ÒÇÑÀÇ ÄÜÅ©¸®Æ®°¡ ÇÊ¿äÇß´Ù. ¶ÇÇÑ, WPL Hybrid-SAFÀÇ Á߸³ ºÎ¾ç ¸Åü´Â ÀçÈ°¿ë Àç·á·Î Á¦Á¶µÈ´Ù.

 

Wessex WaterÀÇ °øÁ¤¼³°è °ü¸®ÀÚÀÎ ¾Øµå·ç °É¸®Æ÷µå(Andrew Gulliford)´Â "SherborneÀÇ ¹° ÀçÈ°¿ë ½Ã¼³À» °èȹÇÏ´Â Ãʱ⠴ܰ迡¼­ WPL°ú ±ä¹ÐÈ÷ Çù·ÂÇÔÀ¸·Î½á ¿ì¸®´Â ÇÔ²² ÀÌ Á¦¾àµÈ »çÀÌÆ®¿¡¼­ °¡´É¼ºÀ» ¿ÏÀüÈ÷ ´Ù½Ã »ý°¢ÇÒ ¼ö ÀÖ¾ú´Ù"¶ó¸é¼­ "Wessex Water °í°´Àº ÀÌ ÇÁ·ÎÁ§Æ®¿¡¼­ 75%ÀÇ ºñ¿ë Àý°¨ È¿°ú¸¦ ¾òÀ» ¼ö ÀÖÀ¸¸ç ´Þ¼ºµÈ ¿¡³ÊÁö È¿À²Àº Áö¼Ó °¡´É¼º ¸ñÇ¥¸¦ ´Þ¼ºÇÏ´Â µ¥ µµ¿òÀÌ µÉ °ÍÀÌ´Ù"¶ó°í ¸»Çß´Ù.

 

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Wessex Water Achieves 75% Saving With Enhanced Process

 


Population growth in the town of Sherborne in Dorset meant that the rural water recycling facility owned and operated by Wessex Water required an upgrade to manage overload. Initially the utility was planning to construct two to three additional 30m-diameter trickling filters, but such a development posed an issue around footprint on this land-constrained site.

 

Instead, the utility was looking for an alternative solution and was scouting for high-rate processes and ways of utilising existing abandoned structures onsite. Andrew Gulliford, process design manager at Wessex Water, identified WPL¡¯s enhanced biological treatment process via an article in an industry publication and invited the company to the Sherborne site.

 

A key advantage of WPL¡¯s Hybrid-SAF precision-engineered treatment system is that it can be retrofitted into any vessel, regardless of shape or size, to deliver more efficient wastewater processing. During the initial collaborative planning stages of the project, the repurposing potential of an abandoned 12m-diameter onsite sludge tank was identified.

 

Together the partners calculated that a potential cost-saving of 75% in capital expenditure could be achieved by retrofitting this existing infrastructure with WPL¡¯s technology as an alternative to the planned project. WPL¡¯s Hybrid-SAF technology comprises a submerged moving-bed, fixed-film reactor and can treat wastewater in a more sustainable and cost-effective way than traditional submerged aerated filters (SAFs).

 

Doubling capacity
 Retrofitting the circular vessel with modular WPL Hybrid-SAF cells could utilise the entirety of the vessel, whilst providing secondary biological treatment for 50% of the works¡¯ flow-to-full-treatment. By doubling the process capacity, a permanent alternative to the planned trickling filters was identified and, looking at a 20-year horizon, one that was significantly cheaper.

 

Off-site manufacture of the modular process technology cells meant that the onsite project delivery time would be a couple of days, rather than a possible 12-months for the civils work required for new trickling filters.

 

WPL¡¯s technical director Andrew Baird says, ¡°WPL¡¯s Hybrid-SAF is a significant step forward for submerged biological treatment. Our research and development team has conceived the hydrodynamic profile underpinning the technology in a new way, which has been made possible by the use of a high specific surface area media.

 

¡°The result is that significant process efficiency advantages have been achieved, including reductions in cost, physical footprint and electricity consumption, all whilst increasing the overall process capacity of the site and improving environmental compliance. Being involved in the project at the start and working collaboratively with Wessex Water meant the best solution for the site could be identified very early on.¡±

 

The first flows entered the system on 1 October 2018 and the first data was recorded on 30 October. Results showed ammonia (NH3) levels at <0.4mg/l, well within the 10mg/l consent demanded by the Environment Agency.

 

Close collaboration
 Getting-in-early on the project and meeting the end-user face-to-face and onsite meant WPL was able to fully understand the objectives of the client. The full scope of the project, including everything from the type of media installed in the biozone to the logistics of restricted access to this rural site, could be considered in designing the optimum solution.

 

Wessex Water also shared the 2040 design horizon with WPL, which ensured a solution that was futureproofed. The utility now has more flexibility in how throughput can be increased at Sherborne for population growth from 12,600 to 15,700 in the catchment.

 

The modular WPL Hybrid-SAF cells were manufactured within six to eight weeks, installed in two days and the process optimised within three weeks. Offsite manufacture also meant onsite health and safety risk was reduced and quality control easier to maintain.

 

Height and width restrictions for vehicles and plant both onsite and in accessing the site were considered at the design stage. Off-site manufacture and shorter project time also meant fewer vehicle journeys, causing less disruption for the local community and reduced carbon emissions.

 

Sustainability benefits
 The 30% smaller site footprint at Sherborne is also reflected in the energy consumption of the plant itself, which is reduced by a similar measure. Variable speed blowers are delivering 50~100% of design requirements, allowing greater headroom for power optimisation.

 

Lower levels of operator maintenance are required than with traditional treatment systems and individual cells can be replaced in a few hours without impacting on service or taking treatment vessels offline.

 

Other sustainability benefits include the repurposing of the tank, which meant there was no need to rip out the existing process treatment vessel and dispose to landfill. A minimal amount of concrete was required in lining the repurposed 12m-diameter tank. In addition, the WPL Hybrid-SAF¡¯s neutrally buoyant media is manufactured from recycled materials.

 

Andrew Gulliford, process design manager at Wessex Water said, ¡°Working closely with WPL at the earliest stages of planning for Sherborne water recycling facility meant that together we could completely reimagine the possibilities at this constrained site. Wessex Water customers will benefit from the 75% cost saving on this project and the energy efficiencies achieved will help deliver our sustainability targets.¡±

 

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