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Pretreatment of wastewater

Primary or pretreatment of wastewater prior to biological treatment involves both physical and chemical treatment depending on the nature of the emission. [Pg.310]

Improvement of the Coincidence of SensorBOD and BOD by Pretreatment of Wastewater Samples... [Pg.94]

The pretreatment of wastewater with hydrolases or acids is one of the best ways to overcome this obstacle, because in this way the big polymer molecules can be decomposed to smaller units, which can be measured by the biosensor. The positive effect of an enzymatic pretreatment of wastewater prior to sensorBOD measurement was demonstrated [53, 66]. In these investigations, different types of wastewaters, which contained milk powder, starch, or cellulose, were treated by proteases, a-amylases, and cellulases or a mix of these enzymes, respectively. This pretreatment resulted in a good correlation between sensorBOD and the conventional five-day BOD, while the sensorBOD values for untreated wastewater were significantly lower (see Table 6). As an example, the sensorBOD of a wastewater from a paper factory increased approximately to the fourfold value when treated by a mixture of cellulase and -glucosidase. [Pg.94]

Table 6. Influence of the pretreatment of wastewater on the measured sensorBOD values... [Pg.95]

Figure 4-6 shows a discontinuously operated adsorption unit including three adsorber vessels connected in series, and filled with active carbon beds for the pretreatment of wastewater. Regeneration... [Pg.287]

Fig. 4-6. Discontinuous adsorption unit for pretreatment of wastewater. Representation according to Uhde [4.17, 4.19]. Fig. 4-6. Discontinuous adsorption unit for pretreatment of wastewater. Representation according to Uhde [4.17, 4.19].
An investment has been made in pretreatment of wastewater and heat recovery systems. [Pg.289]

Aerobic treatment is generally appHed to lower strength wastewaters, whereas anaerobic treatment is employed as a pretreatment for high strength wastewaters. The choice of process depends both on the concentration of organics and the volume of wastewater to be treated. [Pg.185]

Fig. 17. Pretreatment of organic wastewater on trickling filters. Industry types for which coordinates have been plotted are 1, kraft pulp and paper 2, mixed iadustry 3, wet com milling 4, dairy 5, tannery 6, meat packiag 7, food 8, pharmaceutical 9, refinery and 10, textile. Fig. 17. Pretreatment of organic wastewater on trickling filters. Industry types for which coordinates have been plotted are 1, kraft pulp and paper 2, mixed iadustry 3, wet com milling 4, dairy 5, tannery 6, meat packiag 7, food 8, pharmaceutical 9, refinery and 10, textile.
Toxicity. Low toxicity from solvent-vapor inhalation or skin contac t is preferred because of potential exposure during repair of equipment or while connections are being broken after a solvent transfer. Also, low toxicity to fish and bioorganisms is preferred when extraction is used as a pretreatment for wastewater before it enters a biotreatment plant and with final effluent discharge to a stream or lake. Often solvent toxicity is low if water solubility is high. [Pg.1460]

Many industrial-wastewater streams should be pretreated prior to discharge to municipal sewerage systems or even to a centr industrial sewerage system. Pretreatment of individual streams should be considered whenever these streams might have an adverse effect on the total treatment system. [Pg.2213]

In the previous problem, it is desired to treat 12 m /hr of wastewater containing 1 wt/wt% urea. The osmotic pressure of the feed is 7 atm. The power consumption of the system is esdmated to be 5.0 kWh/m of permeate. Maintenance, pretreatment, and operating cost (excluding power) is S0.2/m of permeate. The annualized fixed cost of die system may be evaluated through the following expression ... [Pg.281]

Pre- or post-treatment with ozone of wastewater may also be applied. Pretreatment with ozone takes place in the presence of biorefractory compounds, as ozone increases the BOD/COD ratio. [Pg.168]

U.S. Code of Federal Register 40CFR-Chapter I, Part 467, p. 615, Aluminum Forming Point Source Category, available at http //www.access.gpo.gov.5 Table 5.19 indicates that the regulated parameters for pretreatment of aluminum forming industrial wastewater are chromium, cyanide, zinc, and total toxic organics (TTO). [Pg.222]

Pretreatment of metal-bearing wastewater before sulfide precipitation so that the formation of hazardous gaseous hydrogen sulfide does not occur... [Pg.243]

Of the 130 porcelain enameling industrial plants studied, 30 plants treat their wastewaters for direct discharge into receiving waters, and 100 plants pretreat their wastewaters for discharge into POTWs. [Pg.308]

Givens, S. and Cable, J., Case study—a tale of two industries, pretreatment of confectionary and bakery wastewaters. 1988 Food Processing Waste Conference, presented by the Georgia Tech Research Institute, Atlanta, Georgia, October 31-November 2, 1988. [Pg.1249]

Liu, J.C. and Lien, C.S., Pretreatment of bakery wastewater by coagulation—flocculation and dissolved air flotation, Water Science and Technology, 43, 131-137, 2001. [Pg.1250]

For the assumed type of wastewater this pretreatment step is very often followed by an anaerobic treatment step. This is especially the case if the... [Pg.243]


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See also in sourсe #XX -- [ Pg.427 , Pg.431 ]

See also in sourсe #XX -- [ Pg.427 , Pg.431 ]




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