|
639
<br /> Largon uaRbtanci�NE ZEME
<br /> 0ox 762 P.04tftplpS4FL : G1 � a. r
<br /> - ,� 'ro �. .,,f,; +x�s�s �rs�?'.,ts �,�??i :a,.. _r�� s, ��.�,-.�R to �. , •,. '..�'
<br /> Iii f.,i I, 't ..i :�w' ./•. 1
<br /> Lt y
<br /> !te'.'•9`�?' 0 ftp ,off AO Ftp Fa_ 8q -947 100 t i 1 I , ., i x4 73: ;' i
<br /> 7.
<br /> cPRcentCaft[on,}1}5trsv rs
<br /> Fle78tlule h�rn►id3ty'(R�l),95 ._..gagF. ---700. ---f 1
<br /> tPjt3RE I {Ipf#].As the PH of the jnfluent stream exceeds 50%,oaPitlary Gondsnsetlon i5 initiated.At'',tl i6 poiht,.tkse�:arbon Pore ( s
<br /> rapidry Wilks Winter,int rfe ing w0h tits carbon's abrtity to adsorb VOC&
<br /> FLC,tlRE{ trlob i Seosue adsorp#on is an exothermic process,cooler VOG streams are mere afficieret4y treated by carbon adsOrRtton, ?
<br /> quirexne is f t 7e alrp icatio>},the fol- ing cava6iy.has.bath ahigks adsorpttan ' recover these cath rands#r4rn the cap!-
<br /> lowing ra e rs 1>Qc�ime iinp;D tart: efficiency; and-high regeneration effi- bon wring�e nesakion. ,
<br /> Ga ra li�ngt�pacft .lnsaldi- ciency.-A-knowledge of the working ✓--�sga �, orL:cagzsideratio dTk� j
<br /> fion to i rarI,VaI L'. and pose size capacity of a given carbon type is need- temperature orf regengsatian and the
<br /> 5 iliatriba n' a ICarbo�r's adsarpOun ca- ed to determine tine'capacity of,the chosen agent�lso affects°the working
<br /> cits� i� d to inedi 1 y the co gosi ' Vo Grer overy system and the f7requen- capacity.To recovbr VOCs that are not
<br /> miscible with huate r, steain is the pre-
<br /> tian, co ei tr2&n,ttexnlleratu rela- Cy.of regeneration- ferred regen&atilwg agent, since tEe
<br /> Live hu di4'y,gnd ft0-P,j e of th V OC }� 'iia nature of fru:car6rm, ld a]Y,
<br /> Streatn.i ; i to,recover the maximum volume of Vf)Q phase and steam condensate cin
<br /> Wlsil regent tatipin strips ad�orbed valuable solvents far reuse,a carbon be easily se a atzd withaakan additsoir
<br /> Vaca i t}►e carbo>�,a restdu l facel slsauld be chosen for its high adsorptiox 2l distil3at on step: For the same r j r
<br /> inva �abl left, n the capadty and loin VOC retentivity. A son, noncb>id�nsable gases such as di-
<br /> i of orgy Q Fel r 9
<br /> i i 4in,; he heel, en.�ressed as{a per- , 'microporous carbon would be effective; trogen are; sgmetimes prefextecl p
<br /> s rent,is( aft often do llermined 1 alyti= to recover highly val2tila VOC`�s,:such stripping' vv ter ti$cilale VOCs, a
<br /> ' Bally, sampling tkr carbon after it ' as pad-
<br /> methylene chloride,which are ess� Wiest a d 10 eve bee levels mites e
<br /> has bee r� eilera l.' I stripped to a law heel level. However,
<br /> Tht>I orliittg caPaei y of a given car- r icroporous.carbon is not very effec• VOCs, superheated stea>n is.often n
<br /> bon can en tit described as ttte differ- tive to reeaver moderate-to high-boil effectSve shipping a eni
<br /> once bk en'•the equ€ilFbrtum �dsorp- ing-paint VoCs {with bolling Points of Dutin6'vaLmurA regeneration,apres-
<br /> ian ca city sold tlse iesidual i pel. By.° 1�0-20K) such as xtylene or styrene, sure zeductian causes c�lecteci organ 7
<br /> i I
<br /> impli � on;a cetbvn with a large work- since great effort would be required Vafiuub°lz nerOtion works best o s
<br /> i
<br /> ager hig6� v4iatile organic
<br /> j pounds from high•capicity carlyn. ,
<br /> p -a; aPp i when retative]y high heel Icv&can ibe
<br /> �' tolerated. a . 4
<br /> i To pmmbte vacuum desorption, the I
<br /> i I bbd is heated art .the adstorber vessel is
<br /> evacaat •to 2LIfOUt Z li m 119.11 Ctitn I i
<br /> ° pared to steam`regenera.Lion;this meth-
<br /> "r FIGURE S.
<br /> od reduces-the li elihao of system dor-
<br /> a I ' i' •, While both affect i
<br /> ? carbon's adrerptiOn rasion anr3 plradfkces a cleaner product.
<br /> ' .capacity,rising RFt Ylowveve;, vacuum rngenexataan usj�ai
<br /> a". ; I I 4g; .rectctces it tnore ly hss hijr e�'r egwpmeoi Costs,(for Vary
<br /> p
<br /> than does rising and refri tion units sit,
<br /> r: utt}n ump g
<br /> # I tierrrperature- wed rat the adsorl�'er vessel ifca
<br /> Therefore,steps +
<br /> must be taken t0 extunple}, compared r�ith campetiti
<br /> rernQve moisture methods-• '
<br /> from the waste The ener required to(regenerate .
<br /> ' ,:.1': •;'sx'`;"`�'',';r-.•.d^;?''arc'::�? ;^?4':;s:�•., f
<br /> i :..:'sir ,:r' r....•. R,..'i....Y. .r;'.:a•" j lated
<br /> stream before to tlt9 ,
<br /> � ::t' w'.`�'i. ..3k'. :.;r-�'•" 'i:%.^ !- ed is V'-Yl Pi
<br /> ,. t" '•sw;;' ,,. :st:: •' --• ntrodutx9n it to the
<br /> }`!�' yl tetive`.humldit}i;'. k•::;1 F [�Oiu's4at= n which i r
<br /> + Te??sPeratuse;' 'r 9 t heat of desarptao i
<br /> .i� s;.�. ,,..,,..:... •.�.,•, :carbon bed
<br /> I
<br /> i
<br />
|