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rrtun. ,rti puG~'~n ~ IU•KLIVIIN hriX • %+11G :?~ :~:G S: :S0.'?-__P.: <br />as described in S[ep 7.1.3.1. Hastes and appropriate reduction equipment <br />should be refrigerated, tf possfble, to 4•C prior [o particle-size <br />red~xtinn. The means used to effect particl?-siz? redu_:?cn ,~,. - r.ot <br />generate heat in and of itself. !f reduction of the solid phase of the <br />}i1S t^_ .. ^ecessary, exposure Of th2 'da$te t0 the 2ui:J Sph:re shVUid i)e <br />avoidedcto the extent passible. <br />NOTE: Sieving of the waste is not recommended due [o th? p~ssibili'y that <br />volatiles may be lost. The use of an appropriately graduated ruler is <br />recor,.mended as an acceptable alternative. Surface area requirements are <br />meant for filamentous (g•o•, paper, cloth) and similar waste materials. <br />Actual measurement of surface area is not recorr:ended. <br />.When the surface area or particle-size has been appropriately <br />altered, proceed to Step 1.3.7.' <br />1.3.7 Waste Slurries need not be allowed to stand to permit the <br />solid phase to settle. Do not centrifuge samples prior to filtration. <br />7.3.fl Quantitatively transfer the entire sample (liquid and solid <br />phases) quickly to the ZHE. Secure the filter and support screens into <br />the top flange of the device and secure the tap flange to the ZHE body in <br />accordance with the manufacturer's instructions. Tighten alI.ZHE fittings <br />and place the device in the vertical position (gas inlet/outlet flange on <br />the bottom). Do not attach the extraction collection device to the top <br />plate. <br />Note: If sample material (>17. of original sample weight} has obviously ad'nered <br />to the container used to transfer the sample to the Z'riE, determine the <br />weight of this residue and subtract it from the sample weight determined <br />in Step 7.3.4 to determine the weight of the waste sample that will be <br />filtered. <br />Attach a gas line to the gas inlet/outlet valve (bottom flange) <br />and, with the liquid inlet/outlet valve (top flange) cpen, begin applying <br />gentle pressure of 1-10 psi (or morn if necessary) to force all headspace <br />slowly out of the ZHE device into a hood. At the first appearance of <br />liquid from the liquid inlet/outlet valve, quickly close the valve and <br />discontinue pressure. If filtration of the waste a[ 4•C reduces the <br />amount of expressed liquid over what would be expressed at room <br />temperature, then allow the sample to warm up to room temperature in the <br />device before filtering. If the waste is 100 7. solid (see Step 1.1.1}, <br />slowly increase the pressure to a maximum of 50 psi to force most of the <br />headspace out of the device and proceed to Step 7.3.12. <br />7.3.9 Attach the evacuated pre-weighed filtrate collection <br />container to the liquid inlet/outlet valve and open the valve. Begin <br />applying gentle pressure of 1-]0 psi to force the liquid phase of the <br />sample into the filtrate collection container. [f no additional liquid <br />has passed through the filter in any 2-minute interval, slowly increase <br />the pressure in 10•psi increments to a maximum of 50 psi. After each <br />incremental increase of 10 psi, if no additional liquid has passed through <br />the filter in any 2-minute interval, proceed to the next ]0-psi increment. <br />1312 - 15 Revision 0 <br />November 1992 <br />