... in the tributaries ofthe Amazon river in Brazil, where the Rio Negro is one ofthe most striking examples, and in thecoastal streams of Sumatra and Papua running between the vast expanses of ... at the 1972 International Meetingof Humic Substances a t Nieuwersluis, The Netherlands, Golterman (1975) underscored the importance of peat as the producer of humic substances affecting the ... during the years, has set the stage for the development ofthe concepts and types of humic substances followed today It triggered in the beginning a flurry of investigations and the ligno-protein theory...
... which the area under the growth curve comes to half ofthe area under the growth curve ofthe control) The curves are constructed using the average values ofthe replicates The area under the growth ... representative ofthe organisms of activated sludge, permits us to foresee the impact of toxicants on the processing ofthe wastewater treatment plant The test reaction is the death ofthe test organism ... to the classes of hazard are presented in Table The same approach was adopted in Russia for the attribution ofthe waste as a whole to the classes of hazard The only difference is the use of the...
... Determination ofthe operating pH requires a very careful examination ofthe theoretical basis ofthe process as the number of metals in the wastewater increases The determination ofthe discharge ... material to fix the hazardous wastes Selection ofthe method depends on the type and effect of wastes, applicability ofthe method to the waste, complexity, and cost ofthe method Thermal methods ... in reducing the amount and toxicity ofthe sludges produced Reduction ofthe metal content ofthe wastewater lowers the amount of sludge produced Use of trivalent chromium instead of hexavalent...
... facilitates the maintenance of high concentrations (20 –30 g/L) of VSS in the reactor The flow of influent starts at the bottom ofthe reactor, passes through the blanket of dense granules in the bottom ... destruction of pollutants, absence of residues, and improved biodegradability ofthe effluents Some ofthe disadvantages are extremely short half-life ofthe oxidants and high expense of their generation ... settler section Most ofthe treatment occurs within the blanket of granules The gas collected in the hood area ofthe bioreactor is continually removed while the liquid flows into the settler section...
... general the characteristics ofthe solid wastes generated reflect the type of animal being killed, but the composition within a particular type of operation is similar regardless ofthe size ofthe ... treatment option rather than for product recovery The effectiveness of these units depends on a number of factors and on their position within the series of operations The efficiency ofthe process for ... during the pretreatment stage Another disadvantage ofthe ponding system is the accumulation of solid sludge at the bottom ofthe ponds (Fig 6) Eventually the sludge and scum will clump together...
... between the rim and the tire The tire treads are the part ofthe tire that meets the road surface; their design and composition depend on the use ofthe tire Tire cords are woven synthetic fabrics ... Wastewater The quantity of wastewater generated by a wood preserving plant is a function ofthe method of conditioning used, the moisture content ofthe wood being treated, and the amount of rainwater ... preservative treatment All of these preconditioning methods have, as their objective, the reduction ofthe moisture content in the unseasoned stock to a point where the requisite amount of preservative...
... Part ofthe decomposition above 700°C (not shown on the graph) was attributed to the calcium carbonate ofthe sample, the content of which was about 45% in ash Therefore, the DTG peaks ofthe ... cj is the fraction of combustibles in component j, aj(t) is the reacted fraction of component j in time t and m∞ is the normalized amount ofthe solid residues (minerals) at the end ofthe experiment ... Ej is the activation energy of component j, g expresses the effect of ambient gas composition and f describes the change of surface reactivity as a function ofthe fractional burn off: As the function...
... this, the sensitivity ofthe NCI is significantly better compared with that ofthe PCI As a result, the NCI has also been equally developed in the sense ofthe choices ofthe reagent gases and their ... elemental composition of an ion in low resolution MS, the nominal mass is often used, which enable to count the numbers of each constituent elements However, if the sum ofthe masses ofthe atoms in a ... field of known strength to have the same kinetic energy (given they have the same charge) Therefore, the square ofthe velocity of an ion is reversely proportional to its m/z, Ek = (1/2)mv2 and the...
... rate of application lower than that ofthe primary tank is necessary here because ofthe different character ofthe material to be removed Rates in this portion ofthe system are in the range of ... control is the ratio ofthe volume of MLSS to the dry weight of MLSS This is known as the sludge volume index (SVI) and is in the range of 50 to 100 in well operating plants When the value approaches ... around the edge ofthe pit For proper protection against flies there must be a tight seal around the edge ofthe pit and adequate screening of openings in the privy structure itself In the 1930s...
... suitable rule of Therefore, e 100000 the accumulation of heavy P metals in municipal sewage sludge is different [ ,*oo a on each of zones as well as each of country 80000 The transportation of heavy ... Industrial zones References tll Brian J Alloway, Andrew P Jackson, The behaviour of heavy metal in sewage sludgeamended soils, The Science ofthe Total Environment, | 00 (1991) 5l-176 l5l, t4l of process ... processes [1] The accumulation of heavy metal in sewage sludge depends on characteristic of wastewater treatment plant 3.2 Variation of COD| system and its operation [2] The variation of EC value...
... because ofthe residual sludge concentration is low The method of intermittent discharge adopts the discharge ofthe mixture of sludge and water at a fixed time period, as in the end ofthe mud ... is far from the processing factory The gate of outlet trench is off and the gate of wastewater trench is open in the early stage of precipitation The flush water is discharged into the Applied ... B, C The tanks share the public wall and have hydraulic connection with each other through the public channel at the bottom Outlets ofthe connected channel were installed at the center of the...
... around the axis ofthe agitator at the center ofthe reactor (Fig 1) The packing ratio ofthe fibrous was 60 ± 5% based on the volume ofthe reactor for the attached growth biomass The picture of ... caused by the precipitation of ions or the formation of insoluble hydroxides, or sludge layers on the surface ofthe electrodes These layers insulate the surface ofthe electrodes, consequently ... and 4, respectively These results showed the influence ofthe internal recirculation flow on the phosphorus removal performance ofthe system, and in particular, the effect of dissolved oxygen...
... with the increased HRT ofthe adsorption tank From an engineering application point of view, the appropriate operational parameters ofthe recycle ratio, HRT ofthe regeneration tank, HRT ofthe ... technical feasibility of this process was demonstrated The effects of recycle ratio, HRT ofthe regeneration tank, HRT ofthe adsorption tank and SRT ofthe system were evaluated The removal efficiency ... with a change ofthe HRT ofthe adsorption tank The NH4+-N removal increased with an increase in the HRT The HRT had a similar sensitivity to the PO43 P removal (Fig 4) An increase in the HRT led...
... in the near future under the Kyoto Protocol Therefore, implementation of anaerobic digestion for the treatment of organic solid waste is an urgent issue In the present work, the performance of ... Accumulation of acids decreased the pH, resulting in the failure ofthe whole system The growth rate ofthe acidogenic bacteria is much higher than that of methanogenic archea, and the bacteria can be active ... which most ofthe acids consisted of propionate This indicates that the balance was broken between the production of acids and their consumption by methanogenesis at 30 d HRT Accumulation of acids...
... through opening provided on the head ofthe reactor The vapors then pass through a series of GI pipes interconnected to form two 90 bends The open end ofthe 173 | Proceedings of National Conference ... to the increase of space and disposal costs In a long term neither the land filling nor the incineration solve the problem of wastes, because the suitable and safe depots are expensive, and the ... complete the reactor set up Delivery pipes made of GI pipes and a quenching jar complete the experimental set up The heart ofthe process is a mild steel reactor where the cracking reaction occurs The...
... Society of Medicine, and the Royal Society of Health Professor Cooper is the President ofthe British Academy of Management, is a Companion ofthe (British) Institute of Management, and one ofthe ... Fellows ofthe (American) Academy ofManagement (having also won the 1998 Distinguished Service Award for his contribution to management science from the Academy of Management) Professor Cooper is the ... was awarded the CBE, Commander ofthe Order ofthe British Empire, by the Queen in 2001 Ivan T Robertson is Professor of Work and Organizational Psychology in the Manchester School of Management, ...
... process The next section, ‘ Themanagementof flexible work and workers’’, therefore examines research on the role of managers in the implementation and diffusion of FWAs THEMANAGEMENTOF FLEXIBLE ... Austria, Canada, the USA, and the UK The presence of contributions from such a diverse range of countries indicates the international nature of our discipline One ofthe purposes ofthe international ... one bundle of alternatives will be preferred to another if it contains more of at least one good, and has the same quantity of other goods as the other The fifth assumption, the axiom of continuity,...
... secure the services of eminent members of appropriate professions in the examination of policy matters pertaining to the health ofthe public The Institute acts under the responsibility given to the ... of further analysis The Structure of Agriculture The “structure of agriculture” is a broad phenomenon involving both the characteristics of farms (the system of agricultural production) and the ... NOTICE: The project that is the subject of this report was approved by the Governing Board ofthe National Research Council, whose members are drawn from the councils ofthe National Academy of Sciences,...