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Polyurethane dispersion, or PUD, is understood to be a polyurethane polymer resin dispersed in water, rather than a solvent, although some cosolvent may be used.Its manufacture involves the synthesis of polyurethanes having carboxylic acid functionality or nonionic hydrophiles like PEG (polyethylene glycol) incorporated into, or pendant from, the polymer backbone. [1]
The plant can produce up to 30 million gallons of water a day (136,000 cubic meters) and is one of the region's largest seawater reverse-osmosis plants. [12] [13] During the pretreatment process, suspended particles in the sea water are removed. The water then undergoes reverse osmosis; the same technology used in the production of NEWater. The ...
A planned unit development (PUD) is a type of flexible, non-Euclidean zoning device that redefines the land uses allowed within a stated land area. PUDs consist of unitary site plans that promote the creation of open spaces, mixed-use housing and land uses, environmental preservation and sustainability, and development flexibility. [ 1 ]
Pressure retarded osmosis (PRO) is a technique to separate a solvent (for example, fresh water) from a solution that is more concentrated (e.g. sea water) and also pressurized. A semipermeable membrane allows the solvent to pass to the concentrated solution side by osmosis . [ 1 ]
The Douglas County Public Utility District, or Douglas County PUD, is a public co-operative energy district providing service to Douglas County, Washington. It is owned by its customers and governed by a Board of Commissioners elected by the customer-owners.
The PUD paid for a portion of this project with reserves and received a $900,000 grant in 2009 and a $3.5 million grant in 2010 in addition to using reserves to pay an estimated $4 million of costs. In 2010 the budget estimate was increased to $20 million, half to be paid by the utility, half by the federal government.
Public Utility District No. 2 of Grant County, or Grant County PUD, is a public utility district in north central Washington state. It is owned by its customers and governed by a Board of Commissioners elected by the customer-owners. Though it is not regulated by another governmental unit, a PUD is, by state statute, a nonprofit corporation ...
This process is related to osmosis, the movement of water across a selective membrane, which is why it is called "chemiosmosis". ATP synthase is the enzyme that makes ATP by chemiosmosis. It allows protons to pass through the membrane and uses the free energy difference to convert phosphorylate adenosine diphosphate (ADP) into ATP. The ATP ...