Electrochemical treatment of industrial wastewater and effluent reuse at laboratory and semi-industrial scale
Electrochemical treatment of industrial wastewater and effluent reuse at laboratory and semi-industrial scale
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DOI：
10.1016/j.jclepro.2013.08.006
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发表时间：
2014-02
影响因子：
11.1
通讯作者：
M. Sala;M. C. Gutiérrez-Bouzán
中科院分区：
文献类型：
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作者：
M. Sala;M. C. Gutiérrez-Bouzán
本研究以电化学法处理含染料和盐类的印染废水为基础。处理后的废水被重新组合并在新的染色工艺中重复使用。最初，在实验室试验中处理含有活性染料Novacron Yellow、Ruby和Deepnight之一的合成废水。在所有情况下，染料脱色遵循伪一级反应。随后，七个工业废水中含有这些染料的混合物，收集在西班牙工厂和处理在实验室中试。研究了两种电化学处理方法，并进一步研究了废水的重组和回用。第一种方法包括电化学处理，然后是酸化和汽提步骤以除去碳酸根离子。在第二种方法中，在电化学处理之前进行酸化;随后，在脱色过程中去除产生的CO2。最后，通过半工业中试装置（400 L）在西班牙工厂中原位应用优化工艺。没有显着的颜色差异，赞赏之间的参考染色和织物染色与处理后的废水。印染废水回用后，工艺用水量减少70%，盐排放量减少60%。
This study is based on the electrochemical decolouration of exhausted dyeing effluents which contain dyes and salts. The treated effluents were reconstituted and reused in a new dyeing process.Initially, synthetic effluents containing one of the reactive dyes Novacron Yellow, Ruby and Deepnight were treated in the laboratory pilot. In all cases, the dye decolouration follows a pseudo-first order reaction.Subsequently, seven industrial effluents which contain mixtures of these dyes were collected in a Spanish mill and treated in the laboratory pilot. Two methods for the electrochemical treatment and further effluent reconstitution and reuse were studied. The first method consisted of an electrochemical treatment followed by an acidification and a stripping step to remove the carbonate ions. In the second method, the acidification was carried out before the electrochemical treatment; subsequently, the generated CO2was removed during the decolouration process.Finally, the optimised process was applied in situ in a Spanish mill by means of a semi-industrial pilot plant (400 L). No significant colour differences were appreciated between reference dyeings and the fabrics dyed with the treated exhausted effluents. The reuse of the dyeing effluent achieves the reduction of 70% process water consumption and 60% salt discharge.