Ying Zang,Yuan Yang,Yisong Hu,Huu Hao Ngo,Xiaochang C. Wang,Yu-You Li
Pre-concentrated domestic wastewater (PDWW) rich in organic matters can be a suitable substrate for anaerobic digestion (AD) towards holistic resource and bioenergy recovery. Micron zero-valent iron (ZVI) was applied in designed batch experiments during anaerobic treatment of PDWW to verify its roles in performance enhancement and associated mechanisms. In the selected range of food to microorganism (F/M) ratio, 0.5 gCOD/gMLVSS was most appropriate as biomethane production potential (BMP) of 0.275 L CH 4 /gCOD was obtained. The optimal ZVI dosage at fixed F/M of 0.5 was 6 g/L, further enhancing the BMP by 15.2%. Furthermore, ZVI improved the hydrolysis process (producing more soluble organics) and regulated acidification process (affecting volatile fatty acids distribution). No obvious impact on acetoclastic and hydrogenotrophic methanogenesis processes was noted with ZVI addition. ZVI based AD of the PDWW is promising for promoting the practical application of advanced domestic wastewater treatment strategy (pre-concentration plus anaerobic digestion).
A selective and accurate liquid chromatography–mass spectrometry (LC-MS) method based on magnetic solid-phase extraction (MSPE) and isotope-coded derivatization was developed and validated. The magnetic polydopamine (Fe 3 O 4 @PDA) was prepared as sorbent for enrichment of ten ultraviolet (UV) filters from domestic wastewater samples. The obtained extract and standards were labeled by a pair of isotope-coded derivatization reagents d 0 -/d 3 -10-methylacridone-2-sulfonyl chloride (d 0 -/d 3 -MASC), respectively. The quantification of UV filters was achieved by calculation of the peak area ratios of d 0 -MASC/d 3 -MASC-labeled derivatives. The isotope-coded derivatization strategy was confirmed to be effective in reducing matrix effect and improving sensitivity. Excellent linearity is established with the correlation coefficients > 0.9922. The limits of detection (LODs) were in the range of 0.056–0.128 µg L −1 , and the limits of quantitation (LOQs) were in the range of 0.193–0.315 µg L −1 . The developed method has been successfully applied to the quantification of UV filters in domestic wastewater samples with recoveries ranging from 95.6 to 103.6%. Graphical abstract
危险品化学品经营许可证（带存储）