KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.2
Kong Feng,Geng Zitao,Wang Songqi,Cheng Jiehong,Liu Kejiang,Zhu Jun,Chen Xian,Cheng Shi
Phenothiazines are new synthetic pollutants that have attracted attention in the present years. In order to remove such novel pollutants, in this paper, novel catalytic composites loaded with iron metals (SFCs) were prepared by high-temperature pyrolysis of sewage sludge for the degradation of novel pollutants of phenothiazines, represented by methylene blue (MB). It was found that among the five SFCs prepared, SFC700, prepared at a pyrolysis temperature of 700 °C, had the best pore structure, the largest specific surface area (452.3 m 2 g −1 ), the richest functional groups (such as carboxyl, hydroxyl, and C = O bonds, etc.), the most Fe 3 O 4 content, which exhibited the best performance. SFC700 composites could remove 99.9% of MB within 60 min, and the optimal initial pH was 11. SFC700 had a certain decolorization stability, and the degradation rate could still be maintained at about 90%. It was presumed that SFC700 played the dual role of adsorption and catalysis.
研究领域:
环境科学
·
化学工程
·
污染控制
·
材料科学
✓ 已验证
DOI
高影响因子
ENERGY
·
2025
·
IF 9.4
Xiaoluan Lu,Xiaoqian Ma,Zhaosheng Yu,Yunlong Tian,Xinfei Chen,Feng Hong,Zhenjun Gao
Mitigating heavy metals (HMs) risk while improving fuel properties remains an important challenge in solid fuel production. Hence, ferric citrate (FC) was selected as an additive to analyse its effect on co-hydrothermal carbonization (HTC) of sewage sludge (SS) and corncob (CC). SS and CC were converted to hydrochar at 230–260 °C and its chemical forms of HMs as well as fuel properties were evaluated. Results showed that temperature profoundly affects the influence of FC. At 260 °C and with the help of FC, a low ecological risk index was obtained. The fuel ratio, higher calorific value and combustion performance of hydrochar from co-HTC were enhanced and improved compared to hydrochar from SS. Additionally, FC further promoted dehydration and decarboxylation reactions. This study demonstrates that co-HTC with FC assisted is a viable strategy for producing high-quality biofuel with mitigated HM risks.
研究领域:
环境科学
·
能源工程
✓ 已验证
DOI
高影响因子
WASTE MANAGEMENT
·
2019
·
IF 5.431
Wei Ma,Yuanyuan Tang,Pengfei Wu,Yunxue Xia
Heavy metals such as lead, zinc, and copper always coexist in industrial wastes and tend to be released if the wastes are not treated properly. With abundant contents of aluminum, iron and silicon, sewage sludge incineration ash can provide a ceramic matrix for potential heavy metal stabilization. By using ceramic sintering, this study explored the coimmobilization mechanisms of lead, zinc and copper, with detailed explications on phase transformation, metal distribution and the effect of metal content. PbAl 2 Si 2 O 8 was identified as the major phase for lead immobilization in series with low heavy metal content, while most of the lead was incorporated into Pb 9 (PO 4 ) 6 in high metal series. The Zn x Cu 1-x Fe y Al 2-y O 4 spinel solid solution was the predominant product phase for copper and zinc stabilization in both reaction series, but zinc was more competitively incorporated into the spinel structure. Moreover, the pattern of heavy metal distribution in the sintered products was largely affected by the metal type and elemental composition of the reaction system. Although different leaching behaviors were observed for the three heavy metals, their leachability was found to reach very low value after the thermal treatment processes. This study proposed a “waste-to-resource” strategy to largely alleviate the environmental burden of solid wastes and heavy metal pollution by using sewage sludge incineration ash as raw materials for low-temperature glass-ceramics, with a simultaneous effect on metal immobilization.
研究领域:
环境科学
·
废弃物管理
·
材料科学
·
重金属修复
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jialin Liang,Siwei Zhang,Maoyou Ye,Jinjia Huang,Xian Yang,Shoupeng Li,Shaosong Huang,Shuiyu Sun
Zero-valent iron (ZVI) combined with oxidants is a promising conditioning strategy for improving sewage sludge dewaterability. However, challenges, such as a low dewatering rate and utilization efficiencies of ZVI, restrict further application of ZVI/oxidant treatments. This study employs, for the first time, rapid and cost-effective in-situ generation of Fe 2+ combined with common oxidants, namely H 2 O 2 , Na 2 S 2 O 8 , and KMnO 4 , to effectively improve sludge dewaterability. A comparative investigation of a standalone ZVI/oxidants treatment and when combined with a thermal and acid-wash (TA) pretreatment (TA/ZVI/oxidants) was systematically conducted to determine the sludge dewatering efficiency. Under the optimal operational conditions, the average water content of dewatered cake (Wc) was 18.47% less with the TA/ZVI/oxidants treatment when compared with the ZVI/oxidants treatment. The Wc values decreased to 54.81, 58.06, and 59.32 wt%, after the TA/ZVI/H 2 O 2 , TA/ZVI/Na 2 S 2 O 8 , and TA/ZVI/KMnO 4 treatments, respectively. The potential mechanism by which the TA/ZVI/oxidants treatment enhanced dewatering was investigated by determining the characteristics of both the sludge and the ZVI surface structure. Results indicate that the TA/ZVI/oxidants process caused more Fe 2+ dissolution, more strong oxidizing radicals and more strong flocculating Fe 3+ . The large amount of strong oxidizing radicals and strong flocculating Fe 3+ caused cell lysis and disrupted the protein-like and polysaccharide-like materials in the EPS, thereby decreasing the particle size, negative zeta potential, viscosity and colloidal forces, which then released the bound water trapped within the net-like floc and led to improved sludge dewaterability. In the ZVI reuse experiment, the TA/ZVI/oxidants treatment remained highly effective for sludge dewatering even after four cycles. Furthermore, economic analysis indicates that the TA/ZVI/H 2 O 2 treatment can save approximately 52.32% per year compared with using the traditional polyacrylamide (PAM) treatment.
研究领域:
环境工程
·
污水处理
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Zhihui Pan,Xiongrui Yang,Yilun Liang,Mengze Lyu,Yingru Huang,Hong Zhou,Gang Wen,Huarong Yu,Junguo He
A temperature-sensitive hydrogel modified with sewage sludge ash (SSA) was used as an advanced draw agent for forward osmosis (FO) application in treating chromium-containing wastewater. The performance of the modified hydrogel (SSA-TSH) was measured in terms of the swelling and deswelling properties, as well as adsorption and desorption effects on Cr(VI), chemical oxygen demand (COD), total phosphorous (TP) and ammonium (NH 4 + -N) in chromium-containing wastewater. Furthermore, the efficiencies of wastewater treatment , water flux , and the reusability of the SSA-TSH as draw agent in the FO process (FO-SSA-TSH) using a commercially available thin-film composite membrane (Sterlitech) were also investigated. The results indicated that FO-SSA-TSH achieved high removal rates of pollutants (Cr(VI): 96.9 %–97.4 %, COD: 97.1 %–97.4 %, TP: 97.7 %–99.6 %, and NH 4 + -N: 76.8 %–77.9 %) in various Cr(VI) concentrations (0– 40 mg/L) due to the high rejection rate of FO membrane and notable adsorption capacity of the hydrogel. Moreover, the average water flux of FO-SSA-TSH (1.95– 2.02 LMH) was nearly twice as much as that of the FO with pure temperature-sensitive hydrogel as draw agent (FO-TSH, 1.33– 1.42 LMH) in 24 h chromium-containing wastewater treatment . In addition, SSA-TSH with excellent deswelling property exhibited high water recovery performance and good reusability in low cost and energy consumption after the FO permeation process for wastewater treatment.
研究领域:
环境工程
·
废水处理
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Xiaowei Li,Qingqing Mei,Lubei Chen,Hongyuan Zhang,Bin Dong,Xiaohu Dai,Chiquan He,John Zhou
Microplastics (MPs) as new pollutants of environmental concern have been widely detected in sewage sludge , and may act as significant vectors for metal pollutants due to their adsorption property. Our findings show that Cd, Pb, and Co, but not Ni, contents in sewage sludge are lower than that of corresponding metal irons adsorbed on sludge-based MPs, indicating that the MPs accumulate such metal pollutants as Cd in the sludge samples. In contrast to virgin MPs, sludge-based MPs are one order of magnitude higher adsorption capacity for Cd, which reaches up to 2.523 mg g −1 , implying that there is a considerable enhancement in adsorption potential of the MPs for metals after the wastewater treatment process . SEM analysis shows that sludge-based MPs have rougher and more porous surface than virgin MPs, and FTIR spectra reveal that functional groups such as C O and O H are found on sludge-based MPs. Further, two-dimensional FTIR correlation spectroscopy indicates that C O and N H functional groups play a vital role in the process that sludge-based MPs adsorb Cd, which are not found in virgin MPs. The results imply that increased adsorption potentials of the sludge-based MPs to Cd are attributed to changes in the MP physicochemical properties during wastewater treatment process. In addition, such factors as pH value, and sludge inorganic and organic components also have an effect on the MP adsorption to Cd. Principal component analysis shows that the MPs could be divided into three categories, i.e. polyamide, rubbery MPs (polyethylene and polypropylene) and glassy MPs (polyvinyl chloride and polystyrene). Their adsorption potentials to Cd follow the decreasing order: polyamide > rubbery MPs > glassy MPs. In summary, these findings indicate that MPs may exert an important influence on fate and transport of metal pollutants during sewage sludge treatment process, which deserves to be further concerned.
研究领域:
环境科学
·
污染生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 10
·7345-7358
·
IF 1.833
Wang Ruikun,Zhao Zhenghui,Liu Jianzhong,Lv Yukun,Ye Xuemin
Municipal wastewater sludge (hereafter, sludge) is economically recycled by mixing with coal to prepare slurry fuels, called coal sludge slurry (CSS). However, raw sludge needs to be pretreated before being prepared as CSS because of its high viscosity. Alkali and ultrasonication pretreatment can effectively disrupt the sludge flocs and improve slurrying performance. The alkali pretreatment method takes a long time but has a low cost, whereas the ultrasonication pretreatment method needs a high energy input but takes a short time. This study combined these two methods with complementary advantages to reduce the sludge pretreatment time and ultrasonication energy demand to improve the slurrying performance for sludge. Results showed that, compared with only alkali and only ultrasonication, the combined alkali and ultrasonication pretreatment method had stronger effects on reducing slurry viscosity. The characteristic viscosity η
c of CSS prepared by raw sludge was 1663.60 mPa s. It was reduced to 1033.44 and 1472.10 mPa s, respectively, after the sludge was only pretreated by NaOH and Ca(OH) 2 at a dosage of 10 % dry sludge (DS) for 2 h, while it was reduced to 1205.43 mPa s after the sludge was only pretreated by ultrasonication of 30 kJ/g DS. After combined pretreatment, η
c of CSS was reduced to 774.98 mPa s (NaOH of 10 % DS for 2 h + ultrasonication of 30 kJ/g DS) and 1083.24 mPa s (Ca(OH) 2 of 10 % DS for 2 h + ultrasonication of 30 kJ/g DS), respectively. Apparently, the combined method can effectively decrease the alkali dosage or the ultrasonication energy input.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Environmental Chemistry Letters
·
2022
·Vol. 20
·期 4
·2253-2259
·
IF 13.615
Shi En,Wang Xinyu,Zhang Miao,Wang Xin,Gao Jianchun,Zheng Yunbin
Wastewater treatment generates increasing amounts of unwanted sewage sludges, calling for advanced recycling methods. Here, we transformed sewage sludge into activated carbon by molten salt synthesis with ZnCl 2 . We analyzed the structure and specific surface area of sludge-derived activated carbon by Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analysis. Results show that the mass ratio of ZnCl 2 to sludge had a significant effect on the textural properties and adsorption performance of sludge-derived activated carbon. The maximum specific surface area was 549.72 m 2 /g, and the carbon utilization potential was 178.56 mg (C atom) /g (sludge) , for a mass ratio of ZnCl 2 to sludge of the total carbon mass in sludge-derived activated carbon adsorbed CO 2 and methylene blue can be achieved to 186.68 and 203.18 mg (C atom) /g (sludge) , respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Jie Li,Lanjia Pan,Guangwei Yu,Shengyu Xie,Chunxing Li,Dengguo Lai,Zhiwei Li,Futian You,Yin Wang
The terminal utilization of sewage sludge biochar (SSB) is nonnegligible and significant for sewage sludge (SS) treatment by pyrolysis . In this paper, a novel low-cost recyclable sludge biochar catalyst (SBC) that can be employed as a heterogeneous Fenton-like catalyst was prepared using SSB from SS pyrolysis in a pilot-scale platform for ciprofloxacin (CIP) degradation. The fabricated SBC was analyzed to characterize its surface micrographs, pore structures, and chemical composition. The catalytic effect of SBC on CIP degradation was also explored to determine the feasibility of using SBC to remove aquatic organic contaminants , and its degradation mechanism and pathway were also discussed. SBC can effectively remove CIP by adsorption and enhance the degradation of CIP by its catalytic effect. >80% of the CIP was removed at pH 4.0, and the antimicrobial activity of the resulting products was considerably reduced. The possible degradation mechanism is associated with the synergetic effect of adsorption and oxidative degradation. Oxidizing radical was generated from H 2 O 2 by the activation of Fe 2+ and Fe 3+ , which released from SBC, and HO was the dominant radical in CIP degradation. Piperazine ring cleavage, pyridine cleavage and hydroxylation, F/OH substitution, and defluorination were the dominant degradation pathways. The heavy metal risk assessment showed that SBC exhibits low environmental and ecological risk. This study provides a prospective method for high-value utilization of SSB and a novel and potentially low-cost catalyst for CIP removal from aqueous environments, which is significant for the terminal disposal of SS.
研究领域:
环境科学
·
污水处理
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Yuhan Zhu,Jia Wei,Jun Li
Biochar is a well-known material for pollutant removal owing to its low cost and rich surface functionality. A kind of highly active substance, called environmentally persistent free radicals (EPFRs), can be produced in the preparation process of biochar, playing an important role in the removal of pollutants. In this study, sludge-derived biochars (SBC 120 and SBC 270 ) were prepared by the hydrothermal carbonization under two temperatures (120 °C and 270 °C) to investigate their removal abilities of Cr(VI). The maximum removal amounts of Cr(VI) by SBC 120 and SBC 270 were 16.58 and 22.93 mg·g −1 , respectively. It was further revealed that the appearance of Cr(III), as a result of EPFRs on sludge-derived biochar (SBC) transferred electrons to Cr(VI) in neutral solutions. That is to say, oxygen-centered (O-centered) EPFRs on SBC 120 and carbon-centered (C-centered) EPFRs on SBC 270 all could be used as electron donors to Cr(VI) to make it become Cr(III). This study not only provides a theoretical basis for the mechanism of pollutants removal by sludge-derived biochar but also offers a new perspective on the direct effect of EPFRs on pollutants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 31
·20379-20386
·
IF 4.036
Wenjia Wang,Hongbiao Du,Yuanyuan Huang,Shaobo Wang,Chang Liu,Jie Li,Jinglai Zhang,Shuai Lu,Huansheng Wang,Han Meng
Hydrothermal co-liquefaction has the potential to improve biocrude yield. To investigate the influence of various types of biomass on co-liquefaction with municipal sewage sludge (MSS), experiments on MSS with three kinds of model feedstocks (soy oil, soy protein, and starch) were carried out. Reaction temperatures of 300, 320, and 340 °C proved to be the appropriate reaction temperatures for the highest biocrude yield for soy oil, soy protein, and starch, respectively. A synergistic effect on the biocrude yield of co-liquefaction was proved, and starch showed the highest synergistic effect with a 57.25% increase in biocrude yield, while soy oil only presented a slight synergistic effect. Thermal gravimetric analysis (TGA) results suggested that co-liquefaction with soy oil increased the light oil fractions in biocrude by 20.81%, but protein and starch led to more heavy oil fractions. Gas chromatography-mass spectrometry (GC-MS) indicated that co-liquefaction with protein or starch produced more cyclic compounds in the biocrude, while almost no new components appeared from co-liquefaction with soy oil.
研究领域:
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Xiulei Fan,Weiliang Zhang,Yiming Liu,Shang Shi,Yue Cui,Ziyu Zhao,Jun Hou
The use of biochar materials as catalysts to activate persulfate (PS) for the degradation of antibiotics has attracted much attention. In this study, a carbonaceous material (Cu/Zn-SBC) was prepared from sewage sludge by hydrothermal modification. The efficiency of PS activation by Cu/Zn-SBC was investigated using tetracycline (TC) as the model antibiotic. In the Cu/Zn-SBC + PS system, the TC removal rate reached 90.13% at 10 min and exceeded 99% within 4 h. This not only met the requirement of removing large amounts of pollutants in a short time but also achieved the complete removal of pollutants in the subsequent time. Additionally, the Cu/Zn-SBC + PS system was found to be dominated by radical and nonradical pathways. Cu, hydroxyl and carboxyl groups on the surface of Cu/Zn-SBC promoted the production of free radicals and non-free radicals. Under several changes in reaction conditions and water environment factors, the TC removal rate remained above 85% within 10 min. Furthermore, the removal rate of TC was still 85.79% when Cu/Zn-SBC combined with PS was reused twice and 77.14% when reused four times. This study provides an ideal solution for the treatment of sewage sludge, and offers a stable and efficient material for removing antibiotics from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）