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Electronic waste (e-waste) illegally disposal in Thailand is becoming more widespread. A sustainable metal recovery technology is needed. A phytotechnology called "phytomining" of metals such as nickel (Ni) is a promising technology providing a sustainable solution to the growing e-waste problems. This study investigated the ability of Acacia species in association with e-waste site isolated, plant growth-promoting rhizobacteria (PGPR), Bacillus amyloliquefaciens. Acacia mangium accumulated higher Ni in their tissues when Ni concentrations in soil were lower than 200 mg kg−1. The inoculation of PGPR B. amyloliquefaciens enhanced Ni uptake and accumulation in the leaves, stem, and root. The results showed that the highest Ni concentration was found in the root ash (825.50 mg kg−1) when inoculated plants were grown in soil containing 600 mg kg−1 Ni. Hence, the Ni recovery process and mass balance were performed on root ashes. The highest Ni recovery was 91.3% from the acid (H2SO4) leachate of the ash of inoculated plant treated with 600 mg kg−1 Ni. This demonstrates the feasibility of PGPR-assisted phytomining from Ni-contaminated soil. Phytomining of Ni from any e-waste contaminated sites using Acacia mangium in combination with B. amyloliquefaciens can promote plant growth and improve the uptake of Ni. Phytomining from electronic waste is an appealing technology that can provide a long-term waste management strategy while valuable trace metals can be recovered. In this study, we evaluated the nickel phytomining ability of Acacia mangium in association with PGPR Bacillus amyloliquefaciens. The results from this study showed that Ni recovery from phytomass using A. mangium with B. amyloliquefaciens can be further improved leading to a sustainable waste management strategy. [ABSTRACT FROM AUTHOR]

Supercritical fluid extraction using CO 2 (SCFE-CO 2) was used to examine extraction efficiency of bioactive compounds from irregular-shaped Lion's Mane (LM) mushroom by-products. Optimal SCFE-CO 2 conditions (46.38 °C, 100 bar, and 0.99 mL/min of EtOH flow rate) for maximum yield (a mass fraction of 11.64%), ergosterol (3.74 mg/g dried LM), total phenolic content, TPC (815.93 µg GAE/g dried LM), and antioxidant activity (42.97 µg TE/g dried LM) were determined using following parameters: temperature (40 °C to 60 °C), pressure (100 bar to 300 bar), and EtOH flow rate (0 mL/min to 1 mL/min). EtOH flow rate was a key factor in raising extraction yield and quality. SCFE-CO 2 was equally effective compared to conventional extraction (Maceration) for LM, as there were no significant differences (p ≥ 0.05) in yield, ergosterol content, TPC, or antioxidant activity. This green extraction technology could be an excellent alternative method for recovering bioactive compounds from medicinal mushrooms. [Display omitted] • SCFE-CO 2 was used to extract bioactive compounds from Hericium erinaceus mushroom. • Optimum conditions for SCFE-CO 2 was 46.38 °C, 100 bar, and 0.99 mL/min of EtOH. • EtOH flow rate was a major factor that could improve extraction yield and quality. • SCFE-CO 2 had an efficiency that could be used instead of conventional extraction. [ABSTRACT FROM AUTHOR]