Water. Desalination + reuse
Issue link: https://fhpublishing.uberflip.com/i/1019735
infrastructure, while LA Zoo, a major water user in the city, developed new water management strategies. The plan has identi ed a total 44 water-related integration opportunities between di• erent stakeholders. Stormwater improvement projects recommended by One Water LA 2040 total $5.6 billion, or 42 per cent of the proposed $13.3 billion budget. These were prioritized based on their relative bene ts and ability to meet upcoming regulatory deadlines to reduce pollutants in runo• . "Di• erent concepts were developed," says Minamide. "Low ‹ ow diversions will capture water running o• the streets and, rather than divert it to rivers, channel it through the sewer system to wastewater treatment plants for water reclamation. A preference has been given to multi-bene t projects designed capture stormwater run-o• and either use it to irrigate parkland or store it to allow it to in ltrate into groundwater to undergo natural treatment." One such project currently in design is the proposed Rory M. Shaw Wetlands Park, which will convert a 46-acre, engineered inert land ll into a multi- purpose wetlands park with a 21-acre detention pond. The pond will capture stormwater then take it to a 10-acre wetland designed to function as a natural water treatment system. Water reuse However, funding for these proposed stormwater projects remains uncertain. In November, Los Angeles County, a larger geographic area that includes the City of LA, will ask the pub- lic to vote in support of a new property tax intended to provide a revenue stream. The LA River ‹ ows eastward through a concrete ‹ ood control channel, built a– er a series of devastating ‹ oods in the early 20th century. Growing interest in the river, as both a water source and a recreational area, resulted in the development of the Los Angeles River Flow Study. The study was led by Carollo and set out to calculate the minimum ‹ ow conditions in the river required to meet competing interests for water and determine how much reclaimed water could be safely pumped in from wastewater treatment plants for reuse. Based on the study, One Water LA 2040 proposes to use the river to store water for either groundwater replenishment or as an alternative to potable water for irrigation. Arguably the most advanced aspect of One Water LA 2040, in terms of engineering and technology are the proposed wastewater improvement projects, estimated to cost $3.4 billion, or 26 per cent of the proposed budget. "We have big and bold ideas for what to do with LA's four local wastewater treatment plants, at Hyperion, Tillman, Los Angeles-Glendale and at Terminal Island, which have culminated in a trigger- based strategy for each plant," said Wiersema. Hyperion Water Reclamation Plant has kicked o• pilot work to develop new water treatment methods which, under recommendations in the plan, could be combined with groundwater augmentation for potable reuse. LA Sanitation has begun preliminary designs for another major project to modify Tillman Water Reclamation Plant, in Van Nuys, that would enable it to replenish the San Fernando Groundwater Basin aquifer with up to 30,000 acre-feet per year of puri ed water to increase the supply available for potable use. Another proposed project at LA Glendale WRP would upgrade the facilities to advance treat waste water to supply Headworks Reservoir. With many projects under One Water LA 2040 either in concept stage or early planning, there are numerous opportunities for consultants and suppliers, including water engineers, plant and treatment system designers, facilities managers or equipment suppliers to get involved. "In terms of water reuse we are always looking for people with expertise in advanced water treatment, many of the vendors at the 2018 IDA International Conference on Water Reuse and Recycling were a perfect t," says Minamide. "We also need traditional building contractors who are familiar with wastewater and water recycling. The stormwater side gets a bit more creative and cutting edge, with designers and consultants looking at multiple bene ts, environmental performance and green landscaping." These are very di• erent skills to those required by William Mulholland when designing his aqueduct over a Century ago, but they may prove equally important to the future of the second-most populous city in the US. We have big and bold ideas for what to do with LA's four local wastewater treatment plants, at Hyperion, Tillman, Los Angeles- Glendale and Terminal Island Inge Wiersema, chief of water resources at Carollo Water.desalination+reuse September 2018 On Site 17 property tax intended to provide through a concrete ‹ ood control said Wiersema. Plant has kicked o• pilot work to develop new water treatment methods which, under recommendations in the plan, could be combined with groundwater augmentation for Inge Wiersema, chief of water resources at Carollo