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SO4 −-based oxidation technologies have been considered as key solution in polycyclic aromatic hydrocarbons (PAHs) degradation. This study constructed Fe2+-activated persulfate oxidation to degrade pyrene in water and soil by using batch and column experiments. Pyrene degradation kinetic in polluted water and effects of soil background electrolytes (Cl−, HCO3− and humic acid) on pyrene degradation were both investigated. The variation of soil properties during pyrene degradation in soil was evaluated. Polluted water remediation results showed that approximately 93.2 % of pyrene was degraded by 65 mM of persulfate with Fe2+/persulfate molar ratio of 0.25. In soil, 88.5 % of pyrene was degraded under the same persulfate concentration and Fe2+/persulfate molar ratio, and there was a slight decrease of soil pH (from 6.7 to 5.4). Cl−, HCO3− and humic acid in soil brought an adverse effect to pyrene degradation through scavenging SO4 −. Column study of soil remediation proved the superiority of Fe2+ in activating persulfate, whose application in soil remediation can finally reduce soil pollution and simultaneously avoid the excessive soil acidification in in-situ remediation. In addition, by evaluating the soil organic matter and total organic carbon during the remediation process, it was found that the soil properties have been improved. Therefore, Fe2+-activated persulfate oxidation would be a feasible way to remediate pyrene polluted water/soil. more...

This study established a Fe

A novel activator, corn biochar, was produced to activate persulfate to dewater waste activated sludge (WAS). Results demonstrated that the biochar-activated persulfate oxidation can effectively improve the dewatering performance of WAS. After treating WAS by biochar-activated persulfate oxidation (biochar dosage: 2.1 g/L, persulfate concentration: 7.5 mM) at the original WAS pH, standardized-capillary suction time (SCST) increased to 4.21 times and moisture content (MC) decreased to 43.4%, indicating an excellent performance of WAS dewatering. The decrease of residual persulfate with the increasing biochar dosage during WAS dewatering process illustrated that the role of persulfate in improving WAS dewatering was because of the biochar activation. The behaviors of extracellular polymers (EPS) proved that the protein in tightly bound EPS (TB-EPS) linked to WAS dewatering, and its content significantly reduced to 10.5 mg/g-volatile solids (VS) after WAS treatment. Three-dimensional fluorescence spectroscopy for EPS once again proved that the disintegration of tryptophan protein and humic acid (hydrophobic organic substances in EPS) was responsible for the improvement of WAS dewatering. To sum up, the biochar-activated persulfate oxidation was a feasible application in improving WAS dewatering. more...

To meet the increasing demand of high-power sources in Internet of Things and integrated systems, this work reports a high-power micro supercapacitor (MSC) based on a mesoporous gold framework which is fabricated with all-wafer-compatible microfabrication techniques. Benefiting from the highly electronic/ionic conductive framework and pseudocapacitive MnO 2 decorating, the device remains large capacitance even at fast charging/discharging rate. Meanwhile, the asymmetric electrode architecture expanding the voltage window from 0.8 V to 1.5 V helps to supply the MSC with an excellent power density as high as 60 mW/cm2. As a demonstration, the prototype successfully powers a calculator stably after rapidly charged by alternating current input. This work illustrates the potential of on-chip MSCs for various high-power applications and promotes their further commercialization. more...

This work focused on dewatering performance and heavy metals (HMs) transformation during waste activated sludge (WAS) treatment by employing thermally-activated sodium persulfate (SPS) oxidation combined with a biochar made of wheat straw (WS-BC). Results demonstrated that the combined treatment was an efficient way to improve WAS dewatering, especially when SPS and WS-BC dosages were adjusted to 120 and 150 mg/g-volatile solids (VS), respectively. After being treated at 70 °C without pH adjustment, standardized-capillary suction time (SCST) was increased to 5.03, centrifuged weight reduction (CWR) was increased to 86.8% and moisture content (MC) was decreased to 42.6%, indicating an excellent dewatering performance. The underlying mechanism identified were: (1) SPS oxidation disintegrated extracellular polymers (EPS) at high temperature, thereby releasing EPS-bound water; (2) WS-BC acted as a skeleton builder conducive to form porous structure and provide free water release channels in WAS, which was favorable to improve dewatering properties of WAS; (3) thermally-activated SPS oxidation significantly improved the solubilization and reduced the leaching toxicity of HMs in WAS; and (4) the following WS-BC treatment further reduced the leaching toxicity of HMs in WAS. Therefore, the combined technology might be a promising strategy to improve WAS dewatering and reduce HMs risks in WAS. more...

This paper proposes an interface circuit for a frequency up conversion piezoelectric energy harvester with OPAMP as core controller, which can increase output power by over 400% compared with full bridge circuit. Because of differential amplification characteristics of OPAMP, the failure of traditional logic gates zero-crossing detection circuit in low voltage is overcome. The advantage of frequency up conversion energy harvester is suitable for wide frequency bands, but output waveform is attenuating and oscillating, making circuit design difficult to detect zero-crossing point, causing low power efficiency. Innovations include: (1) Theoretical modeling method of frequency up conversion energy harvester (2) Power management circuit design method suitable for frequency up conversion energy harvester is proposed for the first time. Using OPAMP, control logic is effective in the case of harvester output attenuating and oscillating and current is low. (3) Method about how to choose device parameters. more...

This study prepared a biosurfactant by using piggery wastewater to enhance ethylbenzene removal from contaminated gas in a biotrickling filter (BTF). Experiments were conducted to investigate the enhancement of ethylbenzene removal and the biofilm characteristics in present of the biosurfactant. Results demonstrated that the optimal biosurfactant concentration was 0.1 CMC and the corresponding ethylbenzene removal rate was 87.2%, much higher than that (68.9%) achieved in free of biosurfactant. The inlet ethylbenzene concentration and the empty bed residence time (EBRT) affected ethylbenzene removal as well. In present of 0.1 CMC of biosurfactant, ethylbenzene removal rate decreased from 87.2% to 72.2% with the increasing inlet ethylbenzene from 1000 to 2200 mg/m3, and decreased from 91.1% to 42.7% with the EBRT shorten from 30 to 7.5 s. For the enhancement mechanisms of ethylbenzene removal in BTF, the biosurfactant changed the contents of extracellular polymers (EPS) and decreased negative surface charge of the biofilm in the BTF, which improved the mass transfer of ethylbenzene to biofilm and facilitated the aggregation of microbes, and further improved the removal of ethylbenzene. All in all, the biosurfactant would be a feasible way to enhance the removal of ethylbenzene by the BTF. more...

Figure S10. Alignment of promoter sequence of CsUP from WT and up. (PDF 108 kb)

Figure S8. Genomic DNA sequence alignment of Cs535790 from WT and up (PDF 67 kb)

Figure S5. Alignment of predicted protein sequences between WT and CGN19839. The amino acid highlighted in red is the acid alternation (Ile47 in WT to Val47 in CGN19839) caused by the SNP in the first exon of Csa1G535800. The amino acids highlighted in yellow are abnormal in CGN19839 and the amino acids highlighted in blue are missing in CGN19839. The DnaJ domain at the C-terminal is underlined (PDF 81 kb) more...

Figure S3. Pedicel orientation of B1 and CGN19839 indicating that both inbred lines have the upward-pedicel phenotype (PDF 271 kb)

Table S1. Primers used for mapping, cloning and qPCR. (PDF 186â kb) (PDF 185 kb)

Figure S7. Alignment of coding sequence of CsUP from WT and up with 19 other cucumber lines. The whole coding sequence length is 1404 bp. The 491–495 bp position of up and B1 is the 5-bp deletion highlighted in blue. The 139 bp position of CGN19839 that altered from A to G is highlighted in red, and the 1234–1237 bp position in CGN19839 is the 4-bp deletion in blue (PDF 451 kb) more...

Figure S2. Partial results of linkage analysis with indel-CsUp demonstrating that this marker is co-segregated with the upward-pedicel phenotype (PDF 91 kb)

Figure S4. Structure of Csa1G535800 and two mutation sites in CGN19839. a Structure of Csa1G535800. Boxes and lines indicate exons and introns, respectively. Two green boxes in Csa1G535800 indicate the 5′ UTR and the 3′ UTR. Sequencing results revealed that, compared to WT, CGN19839 has a SNP in the first exon and a 4-bp deletion in the sixth exon of Csa1G535800. The yellow box shows the deletion sequence in CGN19839. b The position of the SNP and the 4-bp deletion in the encoding sequence. Sequencing results revealed that there was a SNP (‘A’ in C-8-6 and ‘G’ in CGN19839) at 139 bp and a 4-bp deletion at 1234–1237 bp from the ATG start codon (PDF 188 kb) more...

Figure S6. Genomic DNA sequence alignment of CsUP from WT, up and CGN19839 (PDF 231 kb)