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首页> 外文OA文献 >Study of chemical oxygen demand and oil-grease reduction for spent caustic from kerosene treating unit in petroleum industry wastewater treatment plant
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Study of chemical oxygen demand and oil-grease reduction for spent caustic from kerosene treating unit in petroleum industry wastewater treatment plant

机译：石油工业废水处理厂煤油处理装置废碱对化学需氧量和油脂减少的研究

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Spent caustic or used caustic soda is generated from the scrubbing process in the petroleum refinery industry. Treatment is needed for spent caustic because it typically has high chemical oxygen demand (COD) and oil-grease (OG) concentration that exceeded the limit of Department of Environment (DOE) regulations. In this study, the spent caustic were tested for its COD concentration by using a spectrophotometer and its OG concentration by using Standard 5520B, liquid-liquid, partition-gravimetric method. Then, the spent caustic was treated by using coagulation and flocculation method with aluminium sulphate as primary coagulant and activated carbon and soda ash as a coagulant aid. The optimum concentration of primary coagulant and coagulant aids was determined from Jar Test. The treated spent caustic was tested for its COD and OG concentration to determine the percentage of reduction of COD and OG concentration. It is found out that the COD concentration for untreated sent caustic is at a range of 12880-23800 mg/L and OG concentration at a range of 2285-6257mg/L. From this study, the optimum concentration of primary coagulant and coagulant aids are 200 mg/L of alum and 15 mg/L of both coagulant aids, which is activated carbon and soda ash that was able to reduce 58.15% of COD and 66.21% of OG concentration in spent caustic wastewater. The usage of coagulant aid reduced the amount of alum needed and increases the coagulation and flocculation efficiency. However, the treated spent caustic still does not meet the DOE requirement for Standard B, which are 10 mg/L for OG concentration and 100 mg/L for COD concentration. Therefore, coagulation and flocculation method alone are not effective in reducing the high COD and OG concentration in spent caustic, to meet with the DOE requirement. A pre-treatment or secondary treatment should be carried out along with coagulation and flocculation treatment method. The information obtained from this study is useful for scale up purpose in the petroleum refining industry that choose coagulation and flocculation method to treat spent caustic wastewater
机译：用过的苛性钠或用过的苛性钠是从炼油厂的洗涤过程中产生的。废苛性碱需要进行处理，因为其通常具有很高的化学需氧量（COD）和油脂（OG）浓度，超过了环境部（DOE）法规的限制。在这项研究中，用分光光度计测试了废苛性碱的COD浓度，并使用标准5520B液-液，分配-重量法测试了其苛性碱浓度。然后，以硫酸铝为主要凝结剂，以活性炭和苏打灰为凝结助剂，采用凝结絮凝法处理废碱。初级凝结剂和助凝剂的最佳浓度由Jar Test确定。测试处理过的废碱的COD和OG浓度，以确定COD和OG浓度降低的百分比。发现未经处理的苛性碱的COD浓度在12880-23800 mg / L的范围内，OG浓度在2285-6257mg / L的范围内。根据这项研究，主要混凝剂和混凝剂的最佳浓度是200毫克/升明矾和15毫克/升两种混凝剂，它们是活性炭和纯碱，能够减少58.15％的COD和66.21％的二氧化碳。废苛性废水中的OG浓度。助凝剂的使用减少了所需明矾的量并提高了凝结和絮凝效率。但是，处理过的废苛性碱仍不符合标准B的DOE要求，OG浓度为10 mg / L，COD浓度为100 mg / L。因此，单独的混凝和絮凝方法不能有效地降低废碱液中高的COD和OG浓度，无法满足DOE要求。预处理或二次处理应与凝结和絮凝处理方法一起进行。从这项研究中获得的信息对于在炼油行业中选择凝结和絮凝方法处理废苛性碱废水的规模化目标有用。

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    Nur Amirah Mohammad Ammar;

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  • 年度 2014
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