Re-recycling

J = Objective function at the exit of the recycle reactor extension X = Dimensionless concentrations within the RR extension Re = Recycle ratio... 

Keywords Asphalt concrete pavement, durability, pavement recycling, recycled hot-mixed asphalt concrete, re-recycling. 

This report contains the results of one study of long-term performance of recycled HMA pavement. The study in question is a 15 year follow-up survey of one of Japan s earlier (1978) full-scale applications of recycled pavement using recycled HMA to pave municipal roads in Nagoya City. In this pavement test, new HMA was applied at the same time so as to compare it with to the recycled pavement. Both the new and recycled pavements are in good condition even to date, and serve as a source of valuable information about pavement durability. We will also report on the results of our investigation of recycled and re-recycled HMA using asphalt concrete lumps collected at a study site. 

Asphalt concrete lumps were collected from the new and recycled HMA areas of the present survey only, and pulverized for use as aggregates in trial mix designs for recycled and re-recycled HMA, respectively, with gradations... 

These results support the idea that re-recycling is possible if (1) a RAP mixing ratio of 50% is used, (2) the penetration of old bitumen is adjusted using only for new HMA, and (3) the bitumen content is set using a reiterative... 

Items New Type of mixture Recycled Dense-graded HMA Re-recycled ... 

This study of a test pavement using recycled HMA, in which the penetration of the old bitumen had been adjusted using new HMA, confirmed the durability of such a pavement and showed that it could maintain a comparatively good level of utility even after 15 years and 3 months of use. Also, with respect to the physical properties, we have found that the bitumen deterioration of layers of the HMA subject for public use was comparatively small and that the repeated reuse of pavement is indeed possible. Such a high evaluation of pavement recycling from the viewpoint of both utility and physical characteristics should broaden the possibilities for expansion into re-recycling. 

Kuriyama, M., Yoshikane, T., Kaneda, M. and Ookouchi, T. (1994) Durability and re-recyclability of hot-mixed asphalt pavement, Road Construction. 

Stinson AM, Wiegand RD, and Anderson RE. Recycling of docosahexaenoic acid in rat retinas during n-3 fatty acid deficiency. J Lipid Res 1991 32 2009-2017. 

The packaging shall be designed and manufactured in such a way that the packaging used is either reusable or re-recyclable. 

The main characteristic of secondary resource is the widely dispersed RE concentrations, from 0.1 to 30 %, and no radioactive Th and U compared with the primary ores. Similarly, they contain abtmdant Nd and Dy. Thus, what is urgently needed in RE recycling is a highly selective and efficient extractant which can obtain individual REs and useful concomitant elements at the same time. 

Oil recycling Oil Recycling Act Oil Red [85-83-6] Oil refineries Oil reprocessing Oil re-refimng Oil resistance... 

Used oil disposal trends include waste minimisation such as by reclaiming used fluid on site, as well as recycling of mineral oil lubricants instead of disposing by incineration. The recycling effort involves a system where spent mineral oils are collected then shipped to specialty refineries where the materials are distilled, hydrofinished, and re-refined into fresh base stocks. These re-refined materials are virtually identical to virgin feedstocks. 

Raffinate acid from the first cycle, containing approximately 7 to 14 g/L U Og is then reoxidized and re-extracted in the second, purification cycle using a solvent containing 0.3 Af D2EHPA and 0.075 AfTOPO. The loaded solvent is washed with iron-free acid to remove iron and then with water to remove extracted and entrained acid. The solvent is stripped with ammonium carbonate [506-87-6] to yield ammonium uranyl tricarbonate [18077-77-5] which is subsequendy calcined to U Og (yellow cake). The stripped solvent is regenerated with mineral acid before recycling (39). 

Based on the evidence that acceptable recycled petroleum products can be produced, there is a considerable legislative record encouraging the recycling of used oil. Starting with the Resource Conservation and Recovery Act in 1976 (20), used oil was held apart from the normal hazardous waste system because the oil was viewed as a valuable commodity. This was followed by the Used Oil Recycling Act in 1980 (33), which removed any federal requirement that lubricants containing re-refined base oil carry special labeling. 

The economics seem to be better for systems where dry powdered fresh hme plus ground recycled hme is injected along with a relatively coarse spray which impinges on and dries out from the reagent, as described by Stouffer et al. [Hs EC Res., 28(1) 20 (1989)]. Witnum et al. [9th Ann. Pitt. Coal Prep. Util. Euv. Control Contractors Conf. (1993)] describes an advanced version of that system that has been further optimized to the point that it is competitive with wet hme-stone scrubbing for >90 percent flue gas desirffurization. 

When considering the availability of nutrients, it is also necessary to examine the significance of nutrient re-use within the waterbody. These internal sources amount not to an additional load, but a multiplier on the recyclability of the same load. This nutrient recycling and the internal stores from which they are recycled are often misunderstood, but there is a dearth of good published data about how these recycling mechanisms operate. Microbial decomposition in the water column is one of several internal loops recognized in recent years, but these are not closed and the flux of nutrients recycled through them is delayed rather than retained. 

The destiny of most biological material produced in lakes is the permanent sediment. The question is how often its components can be re-used in new biomass formation before it becomes eventually buried in the deep sediments. Interestingly, much of the flux of phosphorus is held in iron(lll) hydroxide matrices and its re-use depends upon reduction of the metal to the iron(ll) form. The released phosphate is indeed biologically available to the organisms which make contact with it, so the significance attributed to solution events is understandable. It is not clear, however, just how well this phosphorus is used, for it generally remains isolated from the production sites in surface waters. Moreover, subsequent oxidation of the iron causes re-precipitation of the iron(lll) hydroxide floes, simultaneously scavenging much of the free phosphate. Curiously, deep lakes show almost no tendency to recycle phosphorus, whereas shallow... 

Most pumps don t come out of service because they break. Most pumps go into the shop because they re leaking. Every day all over the world, too many 2,000.00 mechanical seals are thrown into the recycle bin or thrown away because of an lit o-ring. 

In the primary binary loop, production wells recover 170°C hot water from the geothermal reservoir and deliver 3,036 m /lir at 14 bar to heat exchangers in the power plant. Water leaves the heat exchangers at 70-90°C and is recycled to the ground through a re-injection well at a depth of 400-600 m. In the secondary binary loop, the heat from the hot water evaporates the isobutane working fluid at 36 bar and 150°C (Table 4-2). 

FIGURE 20.23 Export of citrate from mitochondria and cytosolic breakdown produces oxaloacetate and acetyl-CoA. Oxaloacetate is recycled to malate or pyruvate, which re-enters the mitochondria. This cycle provides acetyl-CoA for fatty acid synthesis in the cytosol. 

The emissions reductions provided by the catalytic converter also allowed engineers to re-tune their engine designs and add an improved proportional EGR system. By modifying the EGR that recycles exhaust in proportion to intake air (as a function of engine speed) rather than at a constant rate, emissions could be better controlled over a wider range of oper-... 

Reactor vent cooler is RE-1 Reactor vent condenser is RE-2 Reactor recycle pump is RP-1 Level control valv e is Rl C-1 Relief valve is RSV-1... 

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