캘리포니아 메트로폴리탄 물지구(MWD, Metropolitan Water District) 이사회는 최근 현재 태평양으로 배출되는 폐수를 정화하는 대신 지역의 지하수 분지를 충전하는 데 사용할 수 있는 대규모의 지역적 처리 프로젝트의 발전 가능성에 대한 길을 포장하는 프로젝트의 첫 번째 단계를 승인했다.

 

이사회는 LA위생국인 LACSD로부터 계약의 권한을 부여받아 하루처리용량 100만 갤런 규모의 실증플랜트를 개발하며, 미국 전역에서 가장 큰 물재활용 공급 프로그램이 될 수 있는지에 대해 미래의 발전을 위한 조건을 설정한다.

 

 

 

The Metropolitan Water District (MWD) of California's Board of Directors recently approved the first step of a project that will pave the way toward the potential development of a large-scale regional treatment project to purify wastewater currently discharged into the Pacific Ocean and instead use it to recharge local groundwater basins.

 

The board authorized an agreement with the Sanitation Districts of Los Angeles County to develop a 1-million-gallon-per-day demonstration plant and also to establish terms and conditions for future development of what could become the largest recycled water supply program of its kind in the nation.

 

Under the partnership, MWD could ultimately build a new purification plant to produce up to 168,000 acre-feet per year at the Sanitation District's Joint Water Pollution Control Plant in Carson along with about 30 miles of distribution pipelines to replenish groundwater basins in Los Angeles and Orange counties.

 

MWD Board Chairman Randy Record said the proposed program would represent the first in-region production of water by MWD, the Southland's primary water import agency. "The purified water produced by this program would represent a new drought-proof supply to help replenish the region’s groundwater basins, which typically produce about a third of Southern California's overall water needs," he said.

 

MWD General Manager Jeffrey Kightlinger said the proposed project involves the use of established technologies to purify secondary-treated wastewater and convert it into a supply that is suitable for indirect potable reuse through groundwater recharge. "Under this program, water would be purified and injected or spread into local groundwater basins as an added safety barrier before being pumped out and used as drinking water," he said.

 

The MWD Board action authorizes $15 million for the demonstration plant and feasibility studies. The board of directors of the Sanitation Districts of Los Angeles County will consider the proposed agreement terms on Nov. 16. The program's first operational phase could produce about 67,000 acre-feet of recycled water per year. Additional phases could bring total production up to 168,000 acre-feet.

 

[출처 = Water World / 2015년 11월 12일]