Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Recovered water

In one possible sequence the MSA composition is chosen as water-saturated methylene chloride expected to be regenerated by decantation. The boundary-crossing strategic operation is to mix the feed with the MSA. The resulting two-phase mixture is opportunistically fractionated to produce the 2-propanol product as bottoms, and a mixture of water—methylene chloride as distillate. This distillate is opportunistically decanted to recover water-saturated methylene chloride MSA for recycle. The aqueous decanter phase is the water product, which optionally may be further purified by... [Pg.456]

Industrial Wastes. Closely related to seawater concentration is the simultaneous concentration of industrial effluents and recycle of recovered water (see Wastes, industrial). These appHcations are expected to increase as environmental restrictions increase. Examples are the concentration of blowdown from cooling towers in power plants concentration of reverse osmosis blowdown and the processing of metal treatment wastes (11) (see... [Pg.176]

One of the major problems facing our civilization is the availability of pure water. The largest source of water located near many cities is the ocean, but the ocean is filled with large amounts of dissolved salts. To recover water from the sea by any of the conventional distillation processes is to date extremely wasteful of energy and costly. However in... [Pg.264]

Recovered water that contains a small amount of floating free product and dissolved constituent is usually passed through an oleophilic-hydrophobic adsorbent filter to remove the remaining... [Pg.713]

If the remedial action involves the treatment of contaminated water (such as pump-treatment for groundwater recovery or soil-washing for soil recovery, which will be discussed in Section 18.8.2), then the preliminarily recovered water can be combined with a treatment stream for further... [Pg.713]

The aquifer may be recharged with the recovered water in order to flush out the remaining pockets of free gasoline. A drawback to this technique is that the recharging water contains dissolved constituents. [Pg.713]

Observations of the arrival of the C02 acid front at different wells clearly demonstrates that there is a great deal of heterogeneity in the reservoir. Furthermore, the arrival of waters which are undersaturated with respect to calcite suggests that single producing wells are recovering waters with widely different C02 contents. These observations have important implications for the interpretation of produced water compositions in complex reservoirs it must be done in conjunction with detailed reservoir flow models. [Pg.157]

A method frequently used to improve performance of trenches is to incorporate flow enhancement. Typically, this involves the use of a pump to lower the fluid level in the trench, and thus increase the hydraulic gradient. An additional benefit is that the continued flow toward the pump also tends to collect the LNAPL in a smaller area, where it is easier to recover. Water recovered from the trench may be treated for off-site disposal or reinjected upgradient to enhance the flow further. Increased... [Pg.215]

Water discharge is typically handled by the existing treatment and discharge facilities, or treated by carbon filtration prior to discharge where the quantity of recovered water has been minimal. LNAPL is periodically pumped out of the tank and transported to a recycling facility. Periodic tank gauging and product transfers avoid the accumulation of LNAPL to the point where it could be inadvertently discharged with the water. [Pg.224]

When a recovery well is located within a contaminant plume and the pump is started, the initial concentration of contaminant removed is close to the maximum level during preliminary testing. As the pump continues to operate, cleaner water is drawn from the plume perimeter through the aquifer pores toward the recovery well. Some of the contaminant is released from the soil into the water in proportion to the equilibrium coefficient. For example, if the Kd is 1000, at equilibrium, 1 part is in the water and 1000 parts are retained in the soil. If the water-soil contact time is sufficient, complete equilibrium will be established. After the first pore volume flush (theoretically), the concentration in the water will be 0.9 and that on the soil will be 999. With each succeeding flush, the 1000 1 ratio will remain the same. If the time of water-soil contact is not sufficient to establish equilibrium, the recovered water will contain a lesser concentration. A typical decline curve is shown on Figure 9.2. Note the asymptotic shape of the curve where the decline rate is significantly reduced. [Pg.270]

An ideal system would have a balance of the rate of recovered water equal to the reinjected water, in a closed-loop system as shown on Figure 9.7. With a continual recycle system, the pumping would continue until cleanup was achieved. Some regulatory authorities do not allow reinjection of untreated or partially treated water. In that case, fresh makeup water must be continually provided from a nearby source and pumped water must be discharged to a suitable location such as a publicly owned treatment works or surface water body. [Pg.277]

For over a decade, LNAPL occurrence has been investigated beneath an active refinery site in southern California. Numerous monitoring wells along with LNAPL samples have been used to evaluate the extent and character of LNAPL occurrence. LNAPL was found to occur as five pools. The main pools each consist of individual accumulations of distinct product types occurring under both perched and water table conditions. Two different recovery and mitigation strategies have been utilized. In relatively high permeability zones, a system of two-pump recovery wells was used to recover fluids recovered water is reinjected without treatment. In relatively low permeability zones, a system of one-pump recovery wells was used. In the latter case, recovered water is treated prior to disposal. [Pg.369]

The slurry effluent is analyzed for residual organics, and if it meets total organic carbon (TOC) specifications, it is pumped to an evaporator/crystallizer system, where water is evaporated and the salts crystallized for off-site disposal. These inorganic salts are readily stabilized and are suitable for disposal in existing permitted landfills. The recovered water is either reused in the process, sent to a unit that produces deionized water, or used for making caustic solution. If the effluent does not meet TOC specifications, it is routed to an off-specification effluent tank and then returned as part of the SCWO reactor feed. [Pg.101]

Methanol, a side product of methyl chloride hydrolysis, can be recovered and reused. In addition, recovered water is recycled. The products are formulated on site as solutions and are shipped in 1 to 30 gallon containers. [Pg.505]

The vendor claims that the TDR process can be used to treat soil and sludge contaminated with polychlorinated biphenyls, polynuclear aromatic compounds, solvents, dioxins, furans, organic pesticides and herbicides, solvents, petroleum wastes, as well as nonhalogenated volatile and semivolatile compounds. The treated residuals from the process include recovered water, oil that can be used for recycling as an alternative fuel or for recycling or can be disposed, and clean soil that can be used as backfill. The volume of treated sludge is reduced by as much as 95% by this thermal process, depending on the initial level of contaminants. [Pg.443]

The process recovers hydrocarbons suitable for reuse or recycling and recovers water treatable in wastewater treatment facilities. Thermal distillation can be used for waste minimization, recycling, or as a final treatment. [Pg.499]

The paper deals with electrolysis side-stream desalting which offers an alternative solution to the problem of water and salt management in electric power generating plants where blowdown disposal is needed, and where the value of recovered water is considerable. An advanced electrodialysis technology is described. 4 refs, cited. [Pg.273]

Basically, the relative volatility of the components in sea water or saline waters is reversed by this type of ion exchange. Thus, the 3.5% of ordinarily nonvolatile salts present in sea water are made volatile by substituting for them a volatile salt such as one of the ammonium carbonates. This substitution puts distillation in an entirely different light The minor component is now to be distilled away from the major component, water, which should reduce the amount of distillation to be done per unit quantity of water produced by manyfold compared to distillation (or evaporation) processes in which all of the recovered water must be distilled. [Pg.182]

There are environmental (and sometimes safety) concerns with evaporative techniques of the above types whenever the solid to be dried, or the solution to be spray dried or lyophilized, contains volatile organic solvents. Of the above three drying techniques, spray drying is probably the most widely used, especially in recovering water-soluble drug substances from water solution (e.g., the aminoglycosides). [Pg.186]


See other pages where Recovered water is mentioned: [Pg.352]    [Pg.1097]    [Pg.1097]    [Pg.472]    [Pg.260]    [Pg.351]    [Pg.96]    [Pg.1097]    [Pg.1097]    [Pg.329]    [Pg.713]    [Pg.236]    [Pg.62]    [Pg.65]    [Pg.1097]    [Pg.1097]    [Pg.472]    [Pg.163]    [Pg.1294]    [Pg.1294]    [Pg.57]    [Pg.143]    [Pg.105]    [Pg.174]    [Pg.675]    [Pg.1294]    [Pg.1294]    [Pg.194]    [Pg.2844]   
See also in sourсe #XX -- [ Pg.713 ]




SEARCH



Distilled-deionized water, standards recovered

Recovering

© 2024 chempedia.info