Resource extraction waste products

Extraction of various gases and solid waste products resulting from exploitation of geothermal resources has been considered and implemented on a small scale. Thus, B was extracted as a... 

If this method proves to be commercially feasible, a renewable and abundant waste product of forest products manufacture could replace expensive petrochemicals. Additionally, use of an inexpensive waste product from processing of forest products could materially reduce adhesive costs and expand opportunities for manufacture of structural materials from low-quality wood. This benefit is particularly important since the difficulty in producing large, strong, structural members from timber resources of declining quality is growing exponentially with time. The cost-benefit ratios of replacing PRF resins with extracts from conifer barks are, therefore, quite favorable in a honeymoon system. 

A product lifecycle ranges from resource extraction through manufacture to use and final waste disposal or processing. Under the current EU chemical risk assessment procedure, lifecycle thinking considers the risks at each stage of a substance s lifecycle, with the possible summation of multiple sources of exposures to a single substance [144], LCA that quantitatively evaluate the overall environmental and health impacts of processes, services or products can complement risk assessment as a useful decision-support tool for chemical risk management [183, 188, 536]. 

Chemistry, properly supported, will help solve our energy, food, and mineral resource problems, even with our expanding worldwide population (hopefully at a diminished rate). Our endless supply of solar energy will be put to practical use through processes yet to be discovered — direct catalytic conversion to electricity, splitting of water to produce hydrogen fuel, or widespread bioconversion of vegetation and waste products. Chemists will increase the efficiency of extraction of new sources of minerals, and materials scientists will synthesize substitute materials from more abundant supplies. 

Opportunities for P2 at the macroscale can be identified from three distinct perspectives. First, waste-generation audits identify flow rates and compositions of materials in the industrial economy, which are potential P2 targets, from natural resource extraction to consumer product disposal. Second, industrial ecology studies examine the uses and the wastes associated with a particular material. Third, life-cycle analyses (LCA) assess the environmental impacts due to the life cycles of individual products/processes by determining waste generation rates, energy consumption, and raw material usage. 

LCA includes the following important steps materials extraction, manufacturing and waste production, packaging, transportation, product use and product disposal. In order to calculate the amount of emissions and waste created during the life cycle of a product, much fundamental information is needed on manufacturing processes, materials and energy use. A life cycle inventory (LCI) is therefore compiled to record the emissions and resources consumed that can be attributed to a specific product. Databases have been developed that enable the user to input new information or data specific to their products and processes. Ecoinvent v3 (http //www.ecoinvent. org/database/) is probably the most comprehensive international LCI database. The ecoinvent database is included in most LCA software models. The following are some of the software suitable for LCA of plastics (O Neill, 2003) ... 

The public acceptance of relevant industrial activities, like resource extraction and processing, product manufacturing, refining and use, energy generation and consumption as well as waste treatment and disposal practices (see this volume), is much related to the existing preload, sensitivity, or tolerance of a prospective site or area. 

Note Cradle-to-factory-gate refers to the entire production system from the extraction of the required resources to the production of the product under consideration. The system Cradle-to-grave includes, moreover, the waste management after the useful life of the product. 

Life cyde assessment has been developed for analyzing current products from resource extraction to final waste disposal, or from cradle to grave. Apart... 

In addition to the variations in the LHC composition that occur from species to species, each species has its extractives, which include resins and waxes. These constituents are capable of interfering with cellulose hydrolysis because of their hydrophobic nature. Tannins and other highly reactive materials are constituents of some woody species. When LHC is obtained from nonwoody (herbaceous) species, the range of interfering constituents increases greatly. Sugars, starches, dextran, carotenoids, and many isoprenoids are to be found. Operators of a cellulose hydrolysis process that uses municipal solid waste as its biomass resource may experience seasonal variations in composition and chance inclusion of crankcase oil and other products that inhibit enzymes or kill yeast. 

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