[미국] 샌디에이고, 독자적 음용수 재이용 추진
                                          
미국 샌디에이고시 의회는 시에서 추진하는 대규모의 음용수 재이용 프로젝트인 Pure Water 프로그램을 공식적인 의회 결의를 통하여 전폭적으로 지원하기로 결정했다고 밝혔다. 이는 고도의 처리기술을 이용한 물 재이용 프로그램을 이용하여 안전하고 가뭄기간에도 지속적 공급이 가능한 음용수 공급시스템을 구축하는 것이다.

시의 관계자들은 실행전략 공식화를 완료하고 재이용시스템 구축을 위한 상세한 기술적 검토를 추진하고 있다. 이번 단계별 추진에 의한 시스템 구축이 완료되면 하루에 32만톤 수준의 음용수를 공급하게 되며 해안으로 방류시키는 폐수발생량을 절감하는 효과를 얻을 수 있다고 발표했다.

샌디에이고 시 당국은 이번 프로젝트는 현 시장이 강력 추진하는 것으로 현재 사용되고 있는 물의 85%를 수입에 의존하고 있는 상황에서 물의 재이용 프로젝트 추진은 물 공급의 독자적 체계 확립과 아울러 자체적인 지속유지 해결수단이 될 것으로 예상한다.

현재 소규모 장치로 Towne Center 대학 내에서 운전중이며 생산된 물은 연방 및 주정부 음용수 기준에 적합한 수질을 보이고 있다. 처리공정은 3단계로 처리, 멤브레인 여과를 거친후 RO 역삼투 여과 그리고 마지막으로 UV 및 과산화수소를 이용한 고도산화 공정으로 진행되도록 설계·건설될 예정이다.

the San Diego County Water Authority's Board of Directors -- following in the footsteps of the San Diego City Council -- granted their full support to the city's proposed large-scale potable reuse project Pure Water San Diego through a formal resolution.

The San Diego City Council approved a formal resolution on Tuesday, April 29, stating full support of the city's program to provide a safe, secure and drought-proof local drinking water supply through the advanced treatment of recycled water. The resolution grants the authorization to proceed with implementing the various facets of the Pure Water Program.

City staff have begun the formalization of an implementation strategy and have initiated technical studies to refine system-wide reuse concepts developed in the 2012 Recycled Water Study. The study determined that a multi-phase potable reuse project could add up to 83 million gallons per day of highly-reliable water to the region. It also would significantly reduce wastewater discharges to the ocean and help address regulatory compliance at the city's Point Loma Wastewater Treatment Plant by diverting flows.

"The issue of reliable water for our city is more important than ever, and it is one that I have taken a special interest in during my time on the Council and as Mayor," said Mayor Kevin L. Faulconer. "San Diego imports 85 percent of its water, and pursuing potable reuse would give us water independence and create a local sustainable supply of high-quality drinking water. We are currently missing an opportunity by dumping 175 million gallons of useable water to the ocean every day."

Currently, 1 million gallons of water is purified every day at the city's demonstration facility located near University Towne Center. The water produced meets all federal and state drinking water standards but is for testing purposes only. The water is not currently added to the drinking water supply.

The water purification process includes a three-step treatment process of membrane filtration, reverse osmosis (RO) and advanced oxidation with ultraviolet (UV) light and hydrogen peroxide. Following one year of testing and publication of results, the City Council unanimously adopted the findings in April 2013 and set forth directives for implementing water purification in San Diego.

"This is a critical juncture for the city of San Diego. Imported water supplies have doubled in cost since 2008 and are expected to continue to rise, which translates to rate increases for our residents," said Halla Razak, the city's Public Utilities Director. "The Pure Water Program is a comprehensive effort that will provide a secure and reliable long-term local water supply for San Diego while resolving decade-long issues associated with Point Loma."

 

[출처 = Water World / 5월 30일]