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Bibliographic Details
Main Author:	Ervim Lenzi
Format:	Artículo científico
Language:	pt
Published:	Universidade Estadual de Maringá 2011
Subjects:	Ingeniería íon hidróxido metal pesado zinco Tratamento de efluentes efluentes de laboratório
Online Access:	https://www.redalyc.org/articulo.oa?id=303226532011
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Detalhes da utilização do íon hidróxido, HO-, no tratamento de efluentes contaminados com metal pesado zinco Ervim Lenzi Vitor de Cinque Almeida Luzia Otilia Bortotti Favero Fernando Juliato Becker Ingeniería íon hidróxido metal pesado zinco Tratamento de efluentes efluentes de laboratório O estudo abordou o tratamento do efluente gerado num Espectrômetro de Absorção Atômica - EAA, no tocante ao metal pesado zinco, utilizando a propriedade do cátion formar o precipitado Zn(OH)2(ppt). O assunto foi tratado teórica e praticamente. Teoricamente foram levantados parâmetros termodinâmicos e analisada matematicamente a solubilidade do Zn(OH)2(ppt) com a variação do pH. Experimentalmente foi analisado o comportamento da solução aquosa do Zn(OH)2(ppt) e da solução in natura do efluente descartado com o pH. As medidas da concentração de zinco nas diversas situações foram realizadas pelo método da EAA, com limite de detecção (LD) de 0,030 mg L-1. Os resultados nas diferentes situações de solução e pH do meio, para a solubilidade mínima do Zn(OH)(ppt), SMínima, em mg L-1, foram: valor teórico = 2,3; valor experimental para solução de Zn(OH)(ppt) = 0,92; valor para solução in natura = 0,092, respectivamente. Estes valores estão de conformidade com BRASIL-Resolução Conama n. 397/2008. 2011 artículo científico 1806-2563 https://www.redalyc.org/articulo.oa?id=303226532011 pt http://www.redalyc.org/revista.oa?id=3032 Acta Scientiarum. Technology application/pdf Universidade Estadual de Maringá Acta Scientiarum. Technology (Brasil) Num.3 Vol.33

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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