process of wastewater treatment ppt

... concerns in the operation of wastewater treatment plants. The identification and eventual control of bioflocculation mechanisms is therefore of major interest [4]. The formation of stable biological ... operation of the process. In many cases, the efficiency of the clarifier is the limiting factor in producing a high quality effluent, and it is often regarded as the bottleneck of the process ... clarifier is one of the most critical operations in the activated sludge process. Bioflocculation of activated sludge determines how the sludge will dewater, flow, and settle, all of which are...

Ngày tải lên: 27/06/2014, 13:20

Ngày tải lên: 05/09/2013, 10:15

... clean, infiltration has the effect of diluting the strength of wastewater and at the same time increasing the volume requiring treatment. The flow rate of wastewater to treatment works is extremely ... nature of wastewater has led to the development of the present system of treatment found in nearly all the technically-developed countries, which is based on treating large volumes of weak wastewater. In ... food processing. January 19, 2004 14:33 World Scientific Biology of Wastewater Treatmen t (New Edition) bwt Preface to the Second Edition Since writing the first edition of Biology of Wastewater Treatment...

Ngày tải lên: 16/03/2014, 18:09

... for focus in- dude: • end -of- transfer, • beginning -of- transfer, • activity -of- transfer, • goal -of- object, • source -of- object, • goal -of- money, • source -of- money. That is, lexical/zation ... lines of McDonald and Pustejovsky, 1985a). To illustrate the knowledge that bears upon the choice of an open-class lexicM item, let us trace the process of lexicai selection of one of the ... a discussion of problems inherent in this approach see McDonald, Vaughau and Pustejovsky, 1986); the pragmatic nature of some of the tests, as well ms the fine level of detail of knowledge...

Ngày tải lên: 24/03/2014, 02:20

... 1.1 Change of temperature (K) and state of water with enthalpy 373.15 K 273.16 K Temperature Latent heat of melting Sensible heat of gas Latent heat of boiling Sensible heat of liquid Sensible heat of ... the drainage of condensate or the escape of bubbles of vapour. The total heat transfer will be the sum of the two components. Rates of two-phase heat transfer depend on properties of the volatile ... cooling times of thick solids consider the slab as a number of finite layers, each of which is both conducting and absorbing heat over successive periods of time. Original methods of solving transient...

Ngày tải lên: 27/06/2014, 17:20

... the drainage of condensate or the escape of bubbles of vapour. The total heat transfer will be the sum of the two components. Rates of two-phase heat transfer depend on properties of the volatile ... energy (B 1 – A 1 ) may be read off directly in terms of enthalpy of the fluid. The distance of D 1 between the two parts of the curve indicates the proportion of flash gas at that point. The ... atmosphere. For example, R134a has a GWP of 1300, which means that the emission of 1 kg of R134a is equivalent to 1300 kg of CO 2 . The choice of refrigerant affects the GWP of the plant, but other factors also...

Ngày tải lên: 27/06/2014, 18:20

... the chemical processing of chips by a sulphite process the length of chips from 20 to 30 mm and the thickness from 3 to 6 mm are recommended. In a sulphate process the length of chips is from ... disintegrated into chips of required di- mensions (of length l and thickness h). e basic factors which influence the proper- ties of chips and specific consumption of energy in the process of chipping wood, ... impor- tant is also the value of overhang from the plane of the disc in the process of step on the disc and work with a gradual change of the radius for the cutting edge of the knife. Knives for...

Ngày tải lên: 07/08/2014, 10:21

Ngày tải lên: 05/09/2013, 09:38

Ngày tải lên: 05/09/2013, 09:38

... current of a parallel circuit is equal to the sum of the currents of the individual branches of the circuit. 4. The total resistance of a parallel circuit is equal to the reciprocal of the sum of ... that are made of different metals. For example, determining the resistance of a cir- cular-mil-foot of each of the substances may make a basis of comparison of the resistivity of various substances. Note: ... resistance and size of one conductor with another. The unit of linear measurement used is (in regards to diameter of a piece of wire) the mil (0.001 of an inch). A convenient unit of wire length used...

Ngày tải lên: 11/08/2014, 10:22

... seasoned water and wastewater operator knows that flow measurement is an essential part of water and wastewater treatment. Unit processes are designed for spe- cific flow levels, and process adjustments ... 2003 by CRC Press LLC 288 Handbook of Water and Wastewater Treatment Plant Operations In another type of measuring device, the problem might be indicative of grease buildup on magnetic meter ... related to the rate of flow through the pipe. It is often used in wastewater streams since the smooth entry allows solids to be swept through instead of building up as it would in front of an orifice. ...

Ngày tải lên: 11/08/2014, 10:22

... quality of the existing water supply. Surface water is also generally softer (not mineral-laden), which makes its treatment much simpler. © 2003 by CRC Press LLC 442 Handbook of Water and Wastewater ... made up of a combination of solid mate- rial such as rock and gravel and open spaces called pores. Regardless of the type of aquifer, the groundwater in the aquifer is in a constant state of motion. ... of water in an aquifer depends upon the amount of space available between the various grains of material that make up the aquifer. The amount of space available is called porosity. The ease of...

Ngày tải lên: 11/08/2014, 10:22

Ngày tải lên: 05/09/2013, 08:40

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Ngày tải lên: 05/09/2013, 10:15

Ngày tải lên: 05/09/2013, 10:15

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Ngày tải lên: 05/09/2013, 15:28

Ngày tải lên: 05/09/2013, 17:03

... presented on the use of yoga in the treatment of eating disorders at the Interna- tional Association for Eating Disorder Professionals Conference and the University of Florida’s Professional Development ... in the treatment of eating disorders, chronic illness, and the psychological aspects of Lyme Dis ease. Beth Hartman McGilley, PhD, FAED, Associate Professor, University of Kansas School of Me ... practice, it is often these comorbid factors, including depression, anxiety, and post-traumatic stress disorder, that dominate the process of therapeutic engagement. The process of engagement is known...

Ngày tải lên: 12/02/2014, 16:20