ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 26
·35113-35125
·
IF 4.223
An Shaorong,Jin Qiang
In recent years, the excess discharge of ammonia nitrogen from wastewater into surface water has been regulated by more stringent standard. The air stripping method is successfully used to treatment of high-concentration ammonia nitrogen; however, alkali will be added to keep pH more than 10, which is costly and not environment-friendly operation. In this study, an advanced air stripping (AAS) based on foam separation of removing ammonia nitrogen in low concentration from aqueous solution at low pH was proposed. The effect of conditions such as air flow rate, temperature, SDS dosage, coexisting ionic strength, pH, and initial ammonia nitrogen concentration on the removal efficiency was studied. The advanced air stripping exhibited favorable removal efficiency for NH 4 + -N in low concentration from aqueous solution (20 mg·L −1 ) with a broad range of low pH 3.0–9.0. Besides, for strongly alkaline (pH=11.0) solution, the advanced air stripping can alleviate the decrease of pH to some extent and keep ammonia nitrogen stripping out continuously based on equilibrium shift between NH 4 + and NH 3 . A microcalorimeter was applied to demonstrate the interaction between the negatively charged hydrophilic groups of SDS and NH 4 + ions, helping to understand the mechanisms more clearly. The simple operation and the satisfactory removal efficiency could imply that the advanced air stripping is a promising technology for minimizing low-concentration NH 4 + -N. Graphical abstract
研究领域:
环境科学
·
废水处理
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DOI
PubMed
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
JinSong Ri,Yimin Xie,Mingliang Wang,Chunlin Guo,Dengao Chang,CholJin Sin,SongChol Ri
To remove ammonia nitrogen from synthetic wastewater, carbon felt (CF) was modified with potassium chlorate, sulfuric acid, sodium persulfate, and sodium hydroxide. The specific surface area and the pore volume of CF after modification individually increased 1.27 and 1.06 times more than pristine CF, resulted in the improvement of ammonia nitrogen adsorption efficiency superior to pristine CF. Under the optimal conditions—specifically, a dosage of 25 g/L, a synthetic wastewater pH of 5.5, an adsorption time of 240 min, and an initial ammonia nitrogen concentration of 5 mg/L at 25 °C—, the removal efficiency reached 72.8±3.4%, with an adsorption capacity of 0.153±0.013 mg/g. As the initial concentration of ammonia nitrogen increased from 5 mg/L to 200 mg/L, the removal efficiency correspondingly decreased from 72.8±3.4% to 12.5±0.7%, while the adsorption capacity increased from 0.153±0.013 mg/g to 1.052±0.043 mg/g. After seven regeneration cycles at a voltage of 2 V and a charging time of 1 min, the recovery rate of modified CF was 88.1±1.2%, with an ammonia nitrogen removal efficiency of 65.9±1.6%. The adsorption process was described by the Langmuir isotherm and pseudo-second-order kinetic models, indicating that it is characterized by homogeneous monolayer adsorption primarily driven by chemisorption. The ammonia nitrogen adsorption process on modified CF is exothermic and is characterized by a gradual decrease in adsorption rate.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Dongni Sun,Xiaoting Hong,Keming Wu,K.S. Hui,Yingying Du,K.N. Hui
Electro-oxidation using RuO 2 –IrO 2 /Ti plate anode and electrocoagulation using iron plate anode were widely applied to remove ammonia and phosphate in an aquatic environment, respectively. In this work, we designed magnetically bound ZVI microparticles on RuO 2 –IrO 2 /Ti plate as a composite electrode for the simultaneous removal of ammonia and phosphate from aqueous solution via combined EO and EC (EO/EC) processes. We present a series of experiments to study such simultaneous removal under an electric field via the EO/EC process. In the electrochemical unit, mZVI-RuO 2 -IrO 2 /Ti, mZVI-graphite, and RuO 2 –IrO 2 /Ti electrodes were used as anodes. The influence of applied voltage, initial pH, zero-valent iron dosage, reaction temperature, and organic compounds on the EO/EC process was also examined. Ammonia and phosphate could be completely removed at an applied voltage of 10 V, pH of 7, zero-valent iron dosage of 0.1 g, and reaction temperature of 35 °C using mZVI-RuO 2 -IrO 2 /Ti anode when influent ammonia and phosphate concentrations is 200 and 100 mg L −1 . Ammonia degradation was consistent with pseudo-zero-order kinetic model. The characterization was analyzed by scanning electron microscope-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Hence, the mZVI-RuO 2 -IrO 2 /Ti electrode can be used for efficient simultaneous removal of ammonia and phosphate.
研究领域:
环境科学
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电化学工程
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Na Li,Yong Li,Ruitao Lou,Rongwei Xiong,Hong Xu
The release of internal pollutants in shallow lakes is a widely concerning environmental issue. Colloids widely existing in eutrophic shallow lakes will affect the release and migration of pollutants. In this context, the different effects of two colloids [humic acid (HA) and silica (SiO 2 )], either individual or in coexistence, on the adsorption and migration of ammonia nitrogen (NH 4 + -N) in sediments under different ionic strengths (IS) were analyzed, through a series of batch and column experiments. It was found that, under a relatively low IS condition (1 mM Na + ), SiO 2 colloids greatly enhanced the mobility of NH 4 + -N in sediments. With IS increased (20 mM Na + ), the presence of colloids exhibited an impeding effect on the mobility of NH 4 + -N due to colloidal flocculation and precipitation. While HA colloids largely suppressed the mobility of NH 4 + -N in sediments under either low or high IS conditions. HA colloids are more likely to form aggregates and have more adsorption sites than SiO 2 colloids. In the NH 4 + -N–SiO 2 –HA system, HA colloids also showed a retardant effect on the transport of both SiO 2 colloids and NH 4 + -N, and the retardant effect increased with the increase of HA colloid concentration. Exchange coordination and hydrogen bond force, as well as the decreased stability of the colloid system, played an important role in such a retardant effect, which consequently resulted in more NH 4 + -N adsorption. The transport of colloids in the NH 4 + -N–colloids co-transport system can be successfully described by Derjaguin–Landau–Verwey–Overbeek (DLVO) theory. In addition, with an increase of IS, NH 4 + -N transport was enhanced because of competitive adsorption of the cations and NH 4 + -N on colloids and the porous medium . These results implied that abundant HA colloids and low ion concentration can reduce the risk of NH 4 + -N release and migration in sediments and consequently its exchange flux across the sediment-water interface.
研究领域:
环境科学
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水文学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ziyi Deng,Xiaohan Li,Gaosheng Zhang,Guicong Xiao,Yuan Xie,Ru Nie,Shenglin Mai,Jianyou Long,Ziqing Xiao,Ping Zhang,Huosheng Li
Hypochlorite (ClO − )-based chlorination has shown effectiveness in oxidizing and purifying ammonium nitrogen (NH 4 + -N) and thallium (Tl) individually. However, the co-removal of these contaminants remains understudied. Addressing this gap, our study investigated the behaviors and mechanisms of NaClO-based breakpoint chlorination in oxidizing and removing both Tl and NH 4 + -N. The interaction among thallous ions (Tl + ), NH 4 + -N and NaClO in wastewater created a synergistic oxidation effect, which led to high removal efficiencies, exceeding 97 % for both Tl and NH 4 + -N, achieved with a NaClO concentration of 7 mmol/L, across a pH range of 6 to 10 in less than 5 min. Notably, the presence of Tl + , rather than Tl 3+ or Tl 2 O 3 , significantly enhanced the conversion of hypochlorite alongside NH 4 + -N. This coupled process generated chloramines and nitroxyl, along with oxygen-independent hydroxyl radicals formation, which further transformed into chloride radicals, dichlorine radical anions, and chlorine oxide radicals. Introducing these highly reactive species into the binary-pollutant system marked a substantial improvement over single-pollutant systems, yielding significantly higher removal efficiencies. These findings shed new light on the role of Tl in breakpoint chlorination for wastewater containing both Tl and NH 4 + -N.
研究领域:
环境科学
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污水处理
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DOI
高影响因子
PLoS One
·
2023
·Vol. 18
·期 8
·e0290714
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IF 3.7
Xiaomei Wu,Meifeng Ye,Jinglong Wang,Feilong Wu,Cenwei Liu,Zhangting Li,Daiyan Lin,Rilong Yang
The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca 2+ -modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca 2+ -modified soybean straw biochar exhibited excellent adsorption performance for NH 4 + –N (103.18 mg/g) and PO 4 3− −P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.
研究领域:
环境科学
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农业科学
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产品关联
DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2024
·
IF 7.4
Hanling Jiang,Jingwen Wang,Aijuan Zhou,Yong Liu
Advanced oxidation processes (AOPs) for removing ammonia nitrogen (NH4+-N) are of increasing interest in wastewater treatment. In this paper, the UV-activated persulfate (PS) process with CaO was applied to oxidize NH4+-N to nitrogen gas (N2). Nearly all of the NH4+-N (30 mg N/L) could be removed within 15 min, and the N2 selectivity was achieved at 95.0%. The addition of CaO made NH4+-N exist in the form of NH3, and HO• was the critical reactive species for NH4+-N oxidation. NO, N2H4, and NO2– were identified as oxidation intermediates and could be further removed. The reaction between N2H4 and NO2– with the assistance of UV/CaO promoted N2 generation during NH4+-N oxidation. The increased dosages of CaO (0.2 to 4.0 g/L) and PS (0.6 to 2.4 g/L) could enhance the NH4+-N oxidation, while the presence of CO32– (100 mM) significantly retarded the removal of NH4+-N. As high removal of NH4+-N (100%) and high N2 selectivity (>79.5%) could be achieved in lake water and secondary wastewater, the proposed UV/PS/CaO process could be potentially applied for the oxidation of NH4+-N in practical water treatment.
研究领域:
环境科学
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废水处理
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Yan Feng,Zhijie Zhang,Youheng Zhao,Liang Song,Xinwei Wang,Shumin Yang,Yingying Long,Chunhui Zhao,Liping Qiu
Electro-biological particle electrode (EPE) made from steel converter slag (SCS) was used as a particle electrode in an enlarged anode electric biological (EAEB) reactor for Rhodamine B (RhB) wastewater treatment, and its purification performance and microbial community were examined. The results revealed that (1) the EAEB reactor showed much higher average removal rates of RhB, COD and NH 4 + -N, i.e. 91.68%, 87.63%, and 90.54%, which meant an increase by 59.86%, 20.48%, and 14.22%, respectively, compared with BAF; (2) The optimum current intensity (CI) for simultaneously removing RhB, COD and NH 4 + -N in the EAEB reactor was at 1.00 A; and (3) Methylophilus, Aeromonas, Pseudomonas, Pelomonas and Zoogloea accounted for the main bacterial community in EAEB. Therefore, the EAEB reactor with EPE produced from steel converter slag (SCS) was suitable to simultaneously remove RhB, COD and NH 4 + -N.
研究领域:
环境科学
·
微生物学
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DOI
PubMed
高影响因子
Water
·
2025
·Vol. 17
·期 2
·179
·
IF 3
Wei Xu,Xiaoping Zhang,Guichang Zhang,Xin Zhang
The treatment of wastewater using microalgae is regarded as a green and potential technology. However, its engineering application has been largely hindered because of the limitation of microalgae separation and harvesting. Therefore, immobilization technology has been widely used to embed microalgae for wastewater treatment. In this paper, sodium alginate (SA) and polyvinyl alcohol (PVA) as the common immobilized carriers were used to immobilizeankistrodesmus falcatusfor simulated slaughtering wastewater (SSW) treatment. The experimental results of the mass transfer and adsorption of immobilized carriers were found to show that the mass transfer of SA-SiO2gel balls (SS-GB) was better than PVA-SA gel balls (PS-GB) and that the adsorption of PS-GB was better than SS-GB. When immobilizing microalgae with the two kinds of carriers, it was found that SA-SiO2microalgal spheres (SS-MS) were better than PVA-SA microalgal spheres (PS-MS) for the maintenance of microalgal cell activity and that PS-MS were better than SS-MS for the resistance to biodegradation. This is because the carrier of PS-MS had a thick shell and dense structure, while the carrier of SS-MS had a thin shell and loose structure. The results of SSW treatment by PS-MS and SS-MS were found to show that the total phosphorus (TP) removal rates of PS-MS and SS-MS were 90.31% and 86.60%, respectively. This indicates that the TP removal effect of PS-MS was superior to that of SS-MS. The adsorption kinetics simulation showed that the adsorption of TP onto PS-GB was controlled by chemisorption and that the adsorption of TP onto SS-GB was controlled by physical adsorption. The chemical oxygen demand (COD) and ammonium nitrogen (NH4+-N) removal of PS-MS were 9.30% and 10.70%, respectively, and the COD and NH4+-N removal of SS-MS were 54.60% and 62.08%, respectively. This indicates that the COD and NH4+-N removal effect of SS-MS were superior to PS-MS. This is the result of the combined action of the degradation by microalgal cells and adsorption by the carrier.
研究领域:
环境科学
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生物技术
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产品关联
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Meiou Zhang,Bing Yan,Yong Li,Xianjun Xie
The excessive presence of ammonia and ammonium in groundwater poses potential hazards to human health and ecosystems; thus, accurate measurement of the ammonia nitrogen concentration is very important. Herein, a stable and highly luminescent decorated Tb-MOF was prepared by a hydrothermal and substitution reaction. Under the optimized detection conditions, the decorated Tb-MOF can detect ammonia nitrogen with an exceptional fluorescence enhancement in a wide detection range. The detection limit was determined to be 1.5514 × 10–2 μM in the lower concentration range from 0 to 0.0021 M. In addition, the as-prepared nanosensor also exhibited superior detection selectivity and anti-interference with respect to ammonia nitrogen, and the detection mechanism was investigated as the formation of an isoindole complex from dialdehyde with ammonia nitrogen to induce the energy transfer process. Furthermore, its practical ability was studied in groundwater with a decorated Tb-MOF. The detection in actual groundwater samples proves that this material can be used for practical applications. Our research provides a new method for visual, rapid, and in situ detection of ammonia nitrogen in groundwater.
研究领域:
环境科学
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材料科学
·
分析化学
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产品关联
DOI
高影响因子
Frontiers in Environmental Science
·
2022
·
IF 5.411
Yu Bo,Lyu Kai,Li Jiajia,Yang Zhou,Sun Yunfei
Nitrite and ammonia are two of the most common toxic nitrogenous pollutants in aquatic ecosystem, which can pose a serious threat to the health of aquatic organisms. Cladocerans, as an important part of freshwater ecosystem, will inevitably be harmed by these pollutants. To evaluate the combined toxic effects of these nitrogenous pollutants on cladocerans, we simulated 15 combinations of five nitrite concentrations (0, 0.5, 2, 4, 8 mg L−1) and three ammonia concentrations (0, 0.1, 1 mg L−1) to study the changes of life history traits of Daphnia pulex exposed to these combinations for 21 days. Results showed that under the combined stress of nitrite and ammonia, the survival time of D. pulex was shortened, the time to first batch of eggs and time to first brood were delayed, the body size and tail spine length at maturation were reduced, and the total offspring and the number of broods were decreased. There were some synergistically negative effects between the two nitrogenous pollutants. The presence of ammonia reduced the tolerance of D. pulex to nitrite, and vice versa. These findings provided new insights into the combined toxic effects of nitrite and ammonia on the life history traits of cladocerans, and were of great significance for understanding the population dynamics of specific species in cladocerans community under the condition of compound nitrogenous pollutants.
研究领域:
生态毒理学
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Qingjun Zeng,Yifan Zhang,Pingshan Chen,Yuting He,Congli Yi,Chunhua Feng
In situ and simultaneous remediation of a variety of pollutants in sediments remains a challenge. In this study, we report that the combination of electrocoagulation (EC) and electrooxidation (EO) is efficient in the immobilization of phosphorus and heavy metals and in the oxidation of ammonium and toxic organic matter. The integrated mixed metal oxide (MMO)/Fe anode system allowed the facile removal of ammonium and phosphorus in the overlying water (99% of 10 mg/L NH 4 + -N and 95% of 10 mg/L P disappeared in 15 and 30 min, respectively). Compared with the controls of the single Fe anode and single MMO anode systems, the dual MMO/Fe anode system significantly improved the removal of phenanthrene and promoted the transition of Pb and Cu from the mobile species to the immobile species. The concentrations of Pb and Cu in the toxicity characteristic leaching procedure extracts were reduced by 99% and 97% after an 8 hr operation. Further tests with four real polluted samples indicated that substantial proportions of acid-soluble fraction Pb and Cu were reduced (30%–31% for Pb and 16%–23% for Cu), and the amounts of total organic carbon and NH 4 + -N decreased by 56%–71% and 32%–63%, respectively. It was proposed that the in situ electrogenerated Fe(II) at the Fe anode and the active oxygen/chlorine species at the MMO anode are conducive to outstanding performance in the co-treatment of multiple pollutants. The results suggest that the EC/EO method is a powerful technology for the in situ remediation of sediments contaminated with different pollutants.
研究领域:
环境科学
·
污染治理
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产品关联
DOI
PubMed
高影响因子
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