pv module recycling in the us

Information about pv module recycling in the us

Published on January 24, 2008

Author: Raulo

Source: authorstream.com

Content

PV Module Recycling in the US:  PV Module Recycling in the US Ken Zweibel NREL March 2004 Not Much Actual Recycling Being Done:  Not Much Actual Recycling Being Done Except for general requirements such as RCRA (hazardous waste definitions), no Federal actions Some states have regulations that might go beyond RCRA California (CA) has other limits for hazardous materials North Carolina and perhaps CA have recycling programs for items with cathode ray tube Generally, few PV companies have any policies, with a notable exception (First Solar) and some awareness of Pb-solder issues by traditional Si companies Reasons:  Reasons Small volume of product Even smaller volume of waste (given long outdoor life of modules, which postpones disposal) Tiny amounts of problematic materials (lead solder, and some specialty elements in newer, barely commercial technologies like selenium, cadmium) Compare to Energy Industry:  Compare to Energy Industry PV offsets other sources of energy that themselves cause pollution – implied credit? PV is not a classic ‘throw away’ consumer item PV does not consume electricity, it produces it Shouldn’t PV products be compared to energy industry products (not consumer items)? New Industry:  New Industry New industry with much potential value; needs time to get established before regulations make a deep impact on key technical choices What if short-term priorities kill off the best, new choice(s) before they get started? How sure are we that we have the proper balance of good/bad in our valuations – e.g., does CdTe get a credit for sequestering waste Cd from zinc mining? How about improved energy-payback for thin films? At worst, innovative PV module technologies can increase competition, lowering cost Plenty of time (30 years) to make the right decision before waste stream becomes large, due to long outdoor life of modules Some Actions:  Some Actions Thin film companies in CuInSe2 and CdTe keep track of key regulations Aim is to pass TCLP and similar tests First Solar has an extensive program in ES&H of CdTe modules Method of separating materials in waste modules from production ‘Take back’ plan for old/end-of-life modules Recycling of separated materials Close monitoring of manufacturing safety Brookhaven and NREL (DOE) have carried out key studies All aspects of PV ES&H, with emphasis on cadmium, selenium, toxic gases Extensive work on recycling methods and collection procedures “Cadmium Issues in PV” website (http://www.nrel.gov/cdte/) Encourage companies to proactively resolve issues Vasilis Fthenakis Brookhaven National Laboratory:  Vasilis Fthenakis Brookhaven National Laboratory BNL Research on Recycling Collection Infrastructure Technical Feasibility Slide8:  Recycling in Other Industries Collection Infrastructure Paradigms:  Collection Infrastructure Paradigms Slide10:  PV Module Collection & Transportation Costs ($1998 preliminary estimates) Slide11:  Total PV Recycling Cost Leaching of Cd from CdTe PV Modules :  Leaching of Cd from CdTe PV Modules Leaching of Te from CdTe PV Modules:  Leaching of Te from CdTe PV Modules Preliminary Results & Ongoing Research ________________________________________________________:  Preliminary Results & Ongoing Research ________________________________________________________ Cd and Te can be effectively leached from fragments of PV modules with a dilute solution of H2SO4 and H2O2; this can be re-used with a small amount of H2O2 make-up Using a dilute solution has cost-, safety and waste-management advantages over currently used solutions Preliminary results of separating Cd from Te in solution show a 99.86 to 99.99% separation Uniqueness of CdTe and CuInSe2:  Uniqueness of CdTe and CuInSe2 Despite presence of Cd and Se, crucial PV thin film options Demonstrated highest efficiencies for thin films (11% and 13% at module levels, 16.5% and 19% at cells levels, respectively) Best potential for ambitious combination of high module efficiency and very low module costs – combining for dollar/W module potential of under 50 ¢/W, as fully developed and manufactured in volume These are unique technologies that cannot be replaced by those without Cd or Se (which is in the absorber, the key element of each technology) Slide16:  Efficiency (%) CuInSe2 CdTe Amorphous silicon (stabilized) Univ. of Maine Boeing Boeing Boeing Boeing ARCO AMETEK Photon Energy NREL Boeing EuroCIS Univ. of So. Florida Univ. of So. FL BP Solar Kodak Kodak Monosolar Matsushita 12 8 4 0 2000 1995 1990 1985 1980 1975 United Solar 16 20 NREL The Best One-of-a-Kind Laboratory Cell Efficiencies for Thin Films (Standard Conditions) 02658722 2005 RCA ECD NREL Slide19:  Shell Solar CIS Salzburg and Camarillo Longer Term Perspective:  Longer Term Perspective If CuInSe2 and CdTe become highly successful, aim at thinner layers to keep the amounts of material small Densities of Cd and Se around 3 g/cm3 imply 3 g/micron-m2; @ 10% efficiency and 1 micron thickness, that’s 30 MT/GW Layer thicknesses could drop another tenfold to twentyfold (to 0.2 microns) and still absorb 90% of the sunlight Hard challenges to keep efficiencies and production yield high while making layers ultra-thin (may take 15 years to develop this option) 0.2 micron layers imply about 6 MT/GW Due to limited global tellurium and indium supplies, aggregate amounts for cadmium and selenium in CdTe and CuInSe2 must remain small by historical standards (about 2000 MT/yr maximum) even at 100s of GW per year module production – doesn’t this mean the reward far outweighs the risk? Compare to current 20,000 MT/yr use of cadmium – for toys Our goal should be to smartly facilitate the use of PV modules, including proper recycling when the industry reaches a more stable, mature level – and always avoid imposing technology choices prior to proper knowledge of tradeoffs and potentials The risks of reducing PV module competition and reducing long-term cost viability of PV for energy significance would be otherwise too great

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