Assessment of a hybrid technology for liquid fuel dimethyl aminoethyl azide wastewater treatment

IF 1.6 Q3 WATER RESOURCES

Water Practice and Technology Pub Date : 2023-03-23 DOI:10.2166/wpt.2023.040

Mohadeseh Aqaei, S. Pakdehi

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Abstract

Dimethyl aminoethyl azide (DMAZ) is a liquid fuel in the space industry. Although this fuel is non-carcinogenic, its wastewater suffers from some hazardous pollutants, such as sodium azide (NaN3). A hybrid process of coagulation–flocculation and chemical reaction with nitrous acid was applied for the wastewater treatment. The Taguchi method was used for the process optimization. Coagulant concentration, rapid mixing intensity, duration time, CAMP number and settlement time were found to be effective parameters for the efficiency of the former process. Turbidity and total suspended solids (TSS) of the wastewater were used to track the removal efficiency in the first stage. The complete removal efficiency was achieved. In the latter process, NaN3 was removed using a reaction with nitrous acid. pH of the wastewater was optimized as the controlling factor in the second process. Biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NaN3 removals of 98.9, 98.2 and 96.3% were obtained under the optimum conditions, respectively. As a result, a reduction of 91.9% in turbidity, 98.5% in TSS, 98.5% in BOD, 98.1% in COD and 96.7% in NaN3 concentration were observed in the output of the wastewater.

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混合工艺处理液体燃料二甲基氨基乙基叠氮化物废水的评价

二甲基氨基乙基叠氮化物（DMAZ）是航天工业中的一种液体燃料。尽管这种燃料不致癌，但其废水中含有一些危险污染物，如叠氮化钠（NaN3）。采用混凝-絮凝-亚硝酸化学反应的混合工艺处理污水。采用田口法进行工艺优化。混凝剂浓度、快速混合强度、持续时间、CAMP数和沉降时间是影响前一工艺效率的有效参数。利用污水的浊度和总悬浮固体（TSS）来跟踪第一阶段的去除效率。达到了完全的去除效率。在后一种方法中，使用与亚硝酸的反应去除NaN3。在第二步工艺中，以废水的pH值为控制因素进行了优化。在最佳条件下，生化需氧量（BOD）、化学需氧量（COD）和NaN3的去除率分别为98.9%、98.2%和96.3%。结果，废水的浊度降低了91.9%，TSS降低了98.5%，BOD降低了98%，COD降低了98.1%，NaN3浓度降低了96.7%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Water Practice and Technology WATER RESOURCES-

CiteScore

2.30

自引率

6.20%

发文量

136

审稿时长

14 weeks