Ozonização do efluente de extração alcalina e ... - Revista O Papel
Ozonização do efluente de extração alcalina e ... - Revista O Papel
Ozonização do efluente de extração alcalina e ... - Revista O Papel
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caracteristicas iniciais <strong>do</strong><br />
Os experimentos foram realiza<strong>do</strong>s<br />
em um reator<br />
acrilico tubular com 7 cm <strong>de</strong> diametro interno e 20<br />
cm <strong>de</strong> altura equipa<strong>do</strong> com um difusor localiza<strong>do</strong> na<br />
sue parte inferior Figure 1 O ozonio foi produzi<strong>do</strong><br />
por um gera<strong>do</strong>r <strong>de</strong> ozoniol2o<strong>de</strong>lo RMU16 lbAZCO<br />
Ind Canada a partir <strong>de</strong> ar rico em oxigenio Uma<br />
unida<strong>de</strong> <strong>de</strong> Adsorr aocom Alternancia <strong>de</strong> Pressao PSA<br />
Nlo<strong>de</strong>loAS 12 AIRSEP Corp USA foi utilizada<br />
para elevar a concentra ao<strong>de</strong> oxigenio no ar e remover<br />
impurezas O gera<strong>do</strong>r <strong>de</strong> ozonio produz gas<br />
continua a uma concentraCao <strong>de</strong>104<br />
<strong>de</strong> forma<br />
x 103mmol mL<br />
utilizan<strong>do</strong> se uma vazao <strong>de</strong> 500 mL min O gas nao<br />
consumi<strong>do</strong> no reator foi quantifica<strong>do</strong> e <strong>de</strong>strui<strong>do</strong> por<br />
um analisa<strong>do</strong>r <strong>de</strong> ozonio Ma<strong>de</strong>loHA 200GTP Rankin<br />
Ozone Systems Ltd Canada<br />
Procedimento experimental<br />
A ozoniza ao foi realizada a temperature ambiente<br />
<strong>de</strong> 23 C em amostras <strong>do</strong> <strong>efluente</strong> com valores iniciais <strong>de</strong><br />
pH ajusta<strong>do</strong>s para 12 e 7 O ajuste <strong>do</strong> pH<br />
foi realiza<strong>do</strong><br />
utilizan<strong>do</strong> seNaOH e HC1 O processo <strong>de</strong> oxida ao foi<br />
realiza<strong>do</strong> em batelada utilizan<strong>do</strong> se 500 mL <strong>de</strong> <strong>efluente</strong><br />
sob diferentes intervalos <strong>de</strong> tempo Ao final <strong>de</strong> ce<strong>de</strong> tempo<br />
to<strong>do</strong> o volume foi retira<strong>do</strong>para analise A concentra ao<strong>do</strong><br />
ozonio nao consumi<strong>do</strong>off gas foi coletada e quantificada<br />
em intervalos <strong>de</strong> 15 segun<strong>do</strong>s atraves <strong>do</strong> analisa<strong>do</strong>r <strong>de</strong> ozo<br />
nio e plotada versus tempo A curve obtida foi integrada<br />
para<br />
estimative <strong>do</strong> ozonio total nao consumi<strong>do</strong> A <strong>do</strong>se<br />
use Table I shows the efftuenr properties<br />
Ozone oxidation experiments were carried out in a<br />
semi batch bubble column reacior Plexiglas height<br />
20 cm internal diamer er 7 crn equipped with aJive<br />
bubble diffuser at the bottom as shown in Figure 1<br />
PSA Pressure swing adsorptrorz llo<strong>de</strong>l 4S1AIR SEP<br />
Corp LTS was resed to increase oxygen concentration in<br />
the air andto remove impuritiesfrom the gas phase The<br />
oxygen richair was sent to an ozone generator Mo<strong>de</strong>l<br />
RMLII16 ZCO Ind Canaawhere ozone was pro<br />
ducedconr inuousl at aconcentration of104x 103mmoll<br />
neL at afloy rate of500 mLirnin The exhaust gas stream<br />
from the top ofthe ozone reactorpassedthrough an ozone<br />
analyzer Mo<strong>de</strong>lHA 200GTP Rankin Ozone Sysiems Ltc<br />
Canada where flee ozone was guant ed and <strong>de</strong>stroyed<br />
before being releasedto theem ironment<br />
Experinsentul procedrare<br />
Ozonation experiments were conducted at initial<br />
efJiuent pH 12 and 7 and at 23 Croom temperature<br />
The adjustment of wastewater pH was <strong>do</strong>ne using<br />
NaDH andHCI Batch experiments were conducted<br />
on 500 mLof Nastewater at different time inters alsAt<br />
the end of each cle the entire olume was taken for<br />
analysis Ozone concentration in the off gas was col<br />
lected every I5 seconds interval using the ozone ana<br />
lyzer The off gas concentration was plotted against<br />
timefor each ozonation time The curti e obtained was<br />
integrated to estimate the totalnon consumed ozone