مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

مهندسی نساجی گیلان:. گیل تکس

سایت تخصصی نساجی و پوشاک

حذف پساب رنگی کونگو رد با روش اوزوناسیون

congo red  ترکیب پیچیده ای است که از گروه های آروماتیک دی آزوی مختلف تشکیل شده است. این ترکیب در صنعت نساجی به عنوان رنگزای آنیونیک کاربرد زیادی دارد.

در این مقاله استفاده از ازن برای حذف آلودگی حاصل از کاربرد این رنگزا بررسی می شود.


ABSTRACT: Congo red, which has a complex molecular structure with various diazo aromatic groups, is widely used
in textile industry as an anionic dye. The purpose of this study was to investigate the degradation of Congo red in
laboratory solution which had the chemical properties of the rinse waters of textile manufacturing dye-houses and the
samples with Congo red alone wastewater by ozonation and to optimize the reaction parameters such as pH and time
which influence the efficiencies of total organic carbon, total kjeldahl nitrogen and chemical oxygen demand removal.
Ozonation of Congo red dye were carried out in a semi-batch reactor with constant ozone flow rate and concentration
of 23 mL/sec and 13.6 mg/L, respectively. Decolorization was complete within a few minutes of ozonation possibly due
to the cleavage of chromophore groups. It was observed that its structural destruction occurs predominantly at higher
pHs. The reduction of chemical oxygen demand and destruction of the dye was more than 60 % and 42 %, respectively.
Total kjeldahl nitrogen removal was accompanied by slight changes in nitrogen oxides. It can be deduced from the
experimental results that: (a) the mineralization is very weak; (b) the reaction follows the indirect mechanism; i.e., the
interaction of hydroxyl radicals with the dye and (c) the nitrification is rather predominant. Biological oxygen demand
is declined in simulated alkalic and neutral samples respectively. At 13.6 mg O3/L, the biological oxygen demand levels
were significantly enhanced. This might be attributable to the enhancement of its biodegradation at alkaline pHs.
Key words: Biological factor, total organic carbon, chemical oxygen demand, azo dyes, decolorization, effluents

مدیر سایت جمعه 28 بهمن‌ماه سال 1390 ساعت 02:19 ب.ظ
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