Fine Bubble Pretreatment Technology for Compliance with Plating Wastewater Regulations

Morikubo, Satoshi; Takuma, Yasuhiko; Nishida, Aoi; Enomoto, Daisuke; Kosaka, Yukio

doi:10.4139/sfj.71.804

Cited by 1 publication

(2 citation statements)

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“…In addition, the results were compared with those obtained using FB‐P1 in our previous study. [ 30 ] The sample mixed with 1% of FB cleaning wastewater showed a favourable treatment result with a residual zinc concentration of approximately 0.3 mg/L for both FB‐P1 and FB‐P2, which is considerably lower than that specified in the Japanese effluent regulations (2 mg/L). In contrast, the sample mixed with 1% alkaline degreasing agent exhibited a high residual zinc concentration of approximately 24 mg/L, which significantly exceeds the Japanese provisional effluent regulation value of 4 mg/L.…”

Section: Resultsmentioning

confidence: 99%

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Pretreatment with fine bubbles for effective zinc ion precipitation and removal from zinc electroplating wastewater

et al. 2023

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Heavy metals such as zinc are widely used in plating plants for the processing of material surfaces; therefore, an adequate wastewater treatment is required afterwards to comply with wastewater regulations. However, the presence of chemicals such as degreasing agents in the wastewater generated from the plating process inhibits the formation of hydroxides, thereby making treatment of wastewater and compliance with the stipulated regulations difficult. Herein, the effects of fine bubbles on oil cleaning and wastewater treatment were investigated for developing an alternative cleaning technology to degreasing agents. The concentration of fine bubbles significantly affected the oil cleaning. The fine bubbles demonstrated remarkable cleaning of highly viscous oil, which was difficult to remove using pure water. The high cleaning effect of fine bubbles on oil was achieved because of the hydrophobic interaction of the bubbles. Furthermore, a decrease in cleaning effect was observed for samples with uneven shapes, which was attributed to the difficulty in penetration of fine bubbles in materials with irregularities. Furthermore, fine bubble cleaning exhibited better efficiency for wastewater treatment than degreaser cleaning. Therefore, fine bubble cleaning is speculated to be an excellent cleaning technology with high oil cleaning effectiveness and improved wastewater treatability.

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Section: Resultsmentioning

confidence: 99%

“…A combination of physical and chemical methods will be the scope of our future studies to enhance the cleaning F I G U R E 9 Effect of cleaning solution contamination on zinc wastewater treatment. [30] FB, fine bubble. efficiency of the proposed FB-based cleaning method with a lower environmental impact.…”

Section: Discussionmentioning

confidence: 99%