Treatment of seafood processing wastewater toward carbon neutrality: A comparison between coagulation/flocculation, chemical oxidation and absorbent methods

Q1 Environmental Science Case Studies in Chemical and Environmental Engineering Pub Date : 2024-06-15 DOI:10.1016/j.cscee.2024.100792

Nguyen Chuyen Thuan , Vien Vinh Phat , Tran Thi Thai Hang , Tran Le Luu , Jana Tripple , Martin Wagner

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Abstract

Seafood processing wastewater contains many organic pollutants and nutrients that harm the environment if discharged without treatment. It is urgent to search for a solution to treat seafood processing wastewater for sustainable development purposes. This study aims to examine the different physico-chemical techniques used in seafood processing wastewater treatment, focusing on their ability to reduce pollutants with the aim of carbon neutrality. This study compares the effectiveness of coagulation-flocculation using Polyaluminium Chloride (PAC)/Anionic Polyacrylamide (APAM), chemical oxidation using Sodium hypochlorite (NaOCl), and adsorption using granular activated carbon (GAC). The results show that coagulation-flocculation with a PAC concentration of 125 mg/L after 30 minutes achieved a removal efficiency of 73.0 % for total suspended solids (TSS), 14.6 % for total dissolved solids (TDS), 65.0 % for chemical oxygen demand (COD), 50.0 % color, 10.0 % total nitrogen (TN), 1.0 % ammonium (NH₄⁺), and 10.0 % total phosphorus (TP). The addition of 62.5 mg/L APAM increased the removal efficiencies to 75.0 % TSS, 15.0 % TDS, 68.0 % COD, 50.3 % color, 10.1 % TN, 1.01 % NH₄⁺, and 10.5 % TP. pH 6.5 was ideal for the pollutant removal efficiencies in seafood processing wastewater using coagulation/flocculation. On the other hand, when using 500 mg/L of NaOCl in chemical oxidation for 15 minutes, it resulted in much lower pollutant removal efficiencies of 11.0 % TSS, 26.0 % COD, 50.0 % color, 6.80 % TN, 35.0 % NH₄⁺, while the TDS removal efficiency was not significant. Finally, using 20 g/L of GAC after 60 minutes recorded removal efficiencies of 75.0 % TSS, 18.0 % TDS, 56.8 % COD, 55.0 % color, 11.9 % TN, 20 % NH₄⁺, and 12.1 % TP. It was found that coagulation-flocculation was the most effective treatment method for seafood processing wastewater treatment when considering both the removal efficiency and cost benefit, at about 0.21 €/m³. These findings will help to develop efficient physico-chemical treatments for seafood processing wastewater with the aim of carbon neutrality.

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处理海产品加工废水以实现碳中和：混凝/絮凝、化学氧化和吸收方法之间的比较

海产品加工废水中含有许多有机污染物和营养物质，如果不经处理排放，会对环境造成危害。为实现可持续发展，寻找处理海产品加工废水的解决方案迫在眉睫。本研究旨在考察海产品加工废水处理中使用的不同物理化学技术，重点关注其减少污染物的能力，以实现碳中和目标。本研究比较了使用聚合氯化铝（PAC）/阴离子聚丙烯酰胺（APAM）进行混凝絮凝、使用次氯酸钠（NaOCl）进行化学氧化以及使用颗粒活性炭（GAC）进行吸附的效果。结果表明，混凝-絮凝 30 分钟后，PAC 浓度为 125 毫克/升时，总悬浮固体（TSS）的去除率为 73.0%，总溶解固体（TDS）的去除率为 14.6%，化学需氧量（COD）的去除率为 65.0%，色度的去除率为 50.0%，总氮（TN）的去除率为 10.0%，铵（NH4+）的去除率为 1.0%，总磷（TP）的去除率为 10.0%。添加 62.5 mg/L 的 APAM 可将总悬浮固体（TSS）、总溶解氧（TDS）、化学需氧量（COD）、色度、总氮（TN）和总磷（TP）的去除率分别提高到 75.0%、15.0%、68.0%、50.3%、10.1%、1.01% 和 10.5%。另一方面，当使用 500 毫克/升 NaOCl 进行化学氧化 15 分钟时，污染物去除率大大降低，TSS 为 11.0%，COD 为 26.0%，色度为 50.0%，TN 为 6.80%，NH4+ 为 35.0%，而 TDS 的去除率则不明显。最后，在 60 分钟后使用 20 g/L 的 GAC，TSS 去除率为 75.0%，TDS 去除率为 18.0%，COD 去除率为 56.8%，色度去除率为 55.0%，TN 去除率为 11.9%，NH4+ 去除率为 20%，TP 去除率为 12.1%。研究发现，从去除效率和成本效益两方面考虑，混凝-絮凝法是最有效的海产品加工废水处理方法，去除率约为 0.21 欧元/立方米。这些发现将有助于开发高效的海产品加工废水物理化学处理方法，以实现碳中和目标。

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