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Hydroxyquinone compounds, such as 1,4-dihydroxyanthraquinone and alizarin sulfonate, are widely used in dye manufacturing, pharmaceutical manufacturing, and other industries. However, the treatment of hydroxyquinone-containing wastewater has seldom been examined. This study used a precipitation method with barium salt to treat nano-silver industria...
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... study investigated the variations of COD concentration and color at different reaction temperatures (Fig. 2). When the reaction temperature was 15 C, the removal efficiencies of COD and color reached 85.6% and 97.1%, respectively. However, with the increase of the temperature, the removal efficiencies of both COD and color presented a gradual decrease, and their values at 55 C dropped to 73.8% and 89.0%, respectively. It was clear that ...
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Research has been made on BaFe 11 Ti 0.5 Zn 0.5 O 19 compound by high energy milling (HEM) with variation of milling t = 2, 8, and 12 hours. This research was conducted to find out the influence of milling time on magnetic and electromagnetic wave absorption properties of BaFe 11 Ti 0.5 Zn 0.5 O 19 compound. Materials were characterized by X-Ray Di...
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... Selain itu, Ba terlarut dapat dijadikan sebagai bahan baku senyawa BaCl2.2H2O yag diekstrak dari air laut serta larutan sisa produksi garam (bittern) (Wang et al., 2019). ...
Barium (Ba) merupakan salah satu elemen minor di perairan laut yang memiliki nilai ekonomis tinggi apabila dimanfaatkan sebagai produk garam turunan. Sumber utama Ba terlarut berasal dari sungai, dan estuari menjalankan peran penting sebagai pengontrol fluktuasi kadar Ba terlarut pada sungai sebelum masuk ke laut. Penelitian ini bertujuan untuk mengetahui kadar Ba terlarut, distribusi Ba terlarut dan korelasi Ba terlarut dengan salinitas. Kadar Ba terlarut diketahui dari hasil pengujian sampel air laut yang diambil di 9 titik mulai dari daerah estuari hingga laut lepas. Pengujian kadar Ba terlarut menggunakan metode Atomic Absorption Spectrophotometry sesuai SNI 06-6989.39-2005. Kadar Ba terlarut di Perairan Padelegan berkisar antara 0,009-0,003 mg/L. Hasil visualisasi distribusi kadar Ba terlarut tertinggi berada di estuari dan kadar terendahnya berada di stasiun laut lepas. Distribusi Ba terlarut dari estuari hingga laut lepas menunjukkan kadar yang menurun secara bertahap. Hasil korelasi antara kadar barium terlarut dengan salinitas berbanding lurus yang disebabkan oleh intrusi air laut. Barium (Ba) is a minor element in marine waters which has high economic value when used as a derivative salt product. The main source of dissolved Ba comes from rivers, and estuaries play an important role as controlling fluctuations in dissolved Ba levels in rivers before they enter the sea. This research aims to determine dissolved Ba levels, dissolved Ba distribution and the correlation of dissolved Ba with salinity. Dissolved Ba levels are known from the results of testing seawater samples taken at 9 points from the estuary area to the open sea. Dissolved Ba levels were tested using Atomic Absorption Spectrophotometry based on SNI SNI 06-6989.39-2005. Dissolved Ba levels in Padelegan Water range between 0,009-0,003 mg/L. Visualization results of the distribution of the highest dissolved Ba levels are in estuaries and the lowest levels are at open sea. The distribution of dissolved Ba from the estuary to the open sea shows gradually decreasing levels. Correlation results between dissolved barium levels and directly proportional salinity caused by seawater intrusion.
... Microbial degradation of dyes has been proved to be very effective for resource recovery and sustainability [188]. Various microbes have already been identified as bioremediator in various industries [189][190][191][192][193]. Microbes based researches have been published using a variety of microorganisms in liquid and consortiums culture [194][195][196][197]. Adsorption of synthetic dyes using laccase enzymes from P. rubidus, B. juncea, T. versicolor and T. hirsuta [198][199][200][201] and lignin peroxidase enzymes from B. laterosporus MTCC 2298 show 90% degradation potential. There is a surge for bio remediating techniques in waste disposal. ...
Increased industrialization demand using synthetic dyes in the newspaper, cosmetics, textiles, food, and leather industries. As a consequence, harmful chemicals from dye industries are released into water reservoirs with numerous structural components of synthetic dyes, which are hazardous to the ecosystem, plants and humans. The discharge of synthetic dye into various aquatic environments has a detrimental effect on the balance and integrity of ecological systems. Moreover, numerous inorganic dyes exhibit tolerance to degradation and repair by natural and conventional processes. So, the present condition requires the development of efficient and effective waste management systems that do not exacerbate environmental stress or endanger other living forms. Numerous biological systems, including microbes and plants, have been studied for their ability to metabolize dyestuffs. To minimize environmental impact, bioremediation uses endophytic bacteria, which are plant beneficial bacteria that dwell within plants and may improve plant development in both normal and stressful environments. Moreover, Phytoremediation is suitable for treating dye contaminants produced from a wide range of sources. This review article proves a comprehensive evaluation of the most frequently utilized plant and microbes as dye removal technologies from dye-containing industrial effluents. Furthermore, this study examines current existing technologies and proposes a more efficient, cost-effective method for dye removal and decolorization on a big scale. This study also aims to focus on advanced degradation techniques combined with biological approaches, well regarded as extremely effective treatments for recalcitrant wastewater, with the greatest industrial potential.
... Due to adopting liquid-phase chemical reduction with hydroquinone as a reductant, the produced nano-silver wastewater had a high COD concentration as well as a high level of color. The indicators are listed including 14380 mg/l COD concentration, 9270 degree color, and pH value 10.5 (Qunchao Wang et al., 2019) Wastewater management: Regarding the management policies, the Ministry of Natural Resources and Environment (MONRE) has issued a number of decrees, as well as circulars on planning, lake regulations, and registration of waste sources owners as Decree 18/2015; 80/2006 enforced by Vietnamese government; Circular and Decision of MONRE: 35/2015;12/2006;23/2006;125/2003. In addition, MONRE also set out some criteria to assess water sources such as Vietnamese Standard (QCVN) 11: 2015;QCVN 40: 2011;QCVN 39: 2011;QCVN 40: 2011. ...
The state of water pollution and its treatment in Vietnam is very alarming and it directly affects lives of the people and countries' economy on many fields, especially agriculture, which is the main production sector of the country. The main solutions to improve the current situation are to invest in construction of wastewater treatment systems and plants and promoting propaganda activities. Diem Thuy wastewater treatment plant is one of the large wastewater treatment and reuse plants in Vietnam with a capacity of 3000 m 3 / day. The amount of treated wastewater, which contains a huge amount of nutrients for plants, can ensures sufficient supply for 180 ha of agricultural land every year. Fertilizing substances, phosphorus and nitrogen, received from wastewater are worth accordingly 16 million VND and 35 million VND. Using treated water for watering the crops would save local farmers about 50 million VND per year. It is suggested to encourage research and application of simple and affordable wastewater treatment methods, based on biotechnology, at small and medium production facilities.
... Once the water stream is polluted with waste from these industries, it is difficult to treat. Several techniques are used to treat industrial wastewater to dispose of industrial dyes, often using: biological treatment (Paz, 2017), physical and chemical processes, coagulation and flocculation (Zahrim, 2013), and sedimentation (Wang , 2019) Membrane filtration (Alventosa, 2019), electrochemical treatment (Körbahti, 2011) and adsorption methods (Elmoubarki , 2015). Most of these technologies are characterised by high cost; the liquid textile wastes required several treatment stages: First, remove suspended solids by screening, coagulation and sedimentation (Zahrim, 2011). ...
... The kinetic study is an important step in all the processes. (Wang, 2019) was studied using the pseudo-zero, pseudo-first and pseudo-second order for kinetic models which are described by the linear Equations (2) (Emami, 2010). ...
This study aims to synthesize nanoparticles of iron zero valences from black tea (BT-NZVI) and bentonite supported with black tea zero-valent iron (B-BT-NZVI) using black tea extract in an environmentally friendly and sustainable way to remove the reactive blue pigment 238 (RB). 238) from water. The characterization tests for BT-NZVI and B-BT-NZVI were performed by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The zeta potential in the stability of iron nanoparticles was also measured. For measuring the porous material’s surface area, the Brunaune Emmett-Teller (BET) method was used the average diameter of iron nanoparticles was less than 50 nm. BT-NZVI and B-BT-NZVI were used as absorbents in the batch system study. Two adsorption balance models, Langmuir and Freundlich, are used to describe the adsorption process. The Freundlich model matches well with Reactive Blue 238 dye data and has proven successful in the adsorption process. Kinetic data acquired using the pseudo-first and pseudo-second model examined under optimal reaction conditions and a variety of NZVI concentrations. both batch and up-flow packed flow bed reactor with peroxide H2O2 can degrade dyes and utilized in industrial wastewater treatment.
... Water is one of the most important resources for the survival of planetary organisms and an essential tool for the healthy development of humans. Today, due to various reasons such as industrial growth, population growth, climate change, and the simplification of water use water consumption and pollution have increased, and on the other hand, access to clean water has decreased (Khan et al. 2016, Wang et al. 2019, Behrouzeh et al. 2020, Melo et al. 2020. As a result, in addition to managing water resources, planning for the reuse of contaminated water resources is inevitable (Cha et al. 2020, Kumar et al. 2020. ...
Household or office wastewater consists of two parts of faecal and non-faecal wastewater. Non-faecal section, which accounts for more than 60% of household wastewater, is known as grey water. Treating this part of sewage and using it in various areas can greatly reduce the consumption of potable water. In this research, three methods of advanced oxidation processes including Fenton, UV/H2O2, and UV/TiO2 were investigated for treatment of two grey water sourced from Shif Island and Persian Gulf University restaurant in Bushehr province of Iran. These grey waters were highly polluted with COD content of 600 mg/L and 1400 mg/L, respectively. The efficiency of each rocess was determined by measuring the COD removal rate. Results showed that at optimum reaction conditions, the COD removal efficiency of the UV/H2O2 process was the best, compared to the other two processes. The COD removal efficiency of UV/H2O2 process at pH = 3 and H2O2 = 1500 and 750 mg/L for grey water of the Shif Island and Persian Gulf University restaurant were 88% and 90%, respectively. Therefore, the treated gray waters can be reused economically.
... In 10 mM Ca 2+ , more than 2-fold increase in adhesion (0.25 ± 0.13 mN m −1 ) was recorded at 5 mg C per L TA-modified Hmmica relative to that of the HA-modified counterpart (0.11 ± 0.04 mN m −1 ). Furthermore, in the presence of 1 mM Ba 2+ , 35 This is consistent with the reduced CEC of tannin-rich forest soils. 36 HRTEM investigation of TA in the presence of Ba 2+ showed porous toroidal nanostructures due to Ba 2+ -induced polarizability of the π-electron clouds of TA and molecular stacking (Fig. 4c). ...
The evaluation of the nanoscale forces between a silica probe and hematite nanoparticles (NPs) thin layer-coated mica (Hm-mica) in the presence of structurally different natural organic matter (NOM) and inorganic and organic guanidinium (Gd+) cations determines the efficiency of cementing agents towards the stable soil aggregate formation. The force-distance curves showed that electrostatic repulsions between the probe and the 5 and 50 mg C/L humic acid (HA)-modified Hm-mica substrates were initiated at higher probe-substrate separations relative to tannic acid (TA)-modified Hm-mica substrates. The abundance of highly ionizable polar carboxylate moieties in HA compared to TA contributed to stronger probe-substrate repulsion. The ion-specific interactions of the weakly hydrated divalent cations with the adsorbed HA diminished probe-substrate electrostatic repulsion. However, possible exposure of hydrophobic domains contributed to weak adhesion with the silica probe. The maximum adhesion of 0.11 ± 0.04 mN.m-1 was recorded in 5 mg C/L HA-modified Hm-mica in the presence of Ca2+. Nevertheless, 50 mg C/L TA modified Hm-mica exhibited a significant rise in adhesion to 1.44 ± 0.5 mN.m-1 in the presence of Ba2+. Porous nanostructures produced due to Ba2+-assisted molecular gelation of TA possibly contributed to the strong adhesion. Unlike inorganic cations, organic Gd+ has increased probe-substrate adhesion considerably to 3.13 ± 0.29 mN.m-1 in 50 mg C/L HA-modified Hm-mica. The porous nanotubular structures produced by HA in the presence of Gd+ possibly maintained the interfacial water content and facilitated adhesion with the silica probe. Thermodynamic parameters derived from the reactions between the NOMs and the cations further supplemented the force data. Therefore, interactions of sesquioxides nanominerals with soil biodegradation products can improve environmental quality and mitigate the effects of destabilizing forces.
... In wastewater treatment systems, three treatment processes are often chosen to treat wastewater, namely physical, chemical and biological processes (Wang et al. 2019). Nowadays, the combination of such processes can also be observed. ...
Improperly treated heavy metal wastewater discharged into water sources could cause a serious issue for the environment. The aim of this study was to bioaccumulate iron (Fe) using native bacteria isolated from the laboratory drainage water containing a high concentration of iron. The experiment was conducted in 250 mL conical flasks containing 150 mL Fe solution in concentrations of 25, 100, and 250 mg/L, respectively. Approximately 10% of bacteria inoculum was cultivated in each Fe concentration for 24 and 48 hours. The results showed that Pseudomonas hibiscicola was identified as an effective iron-accumulating species of bacteria. The species could remove Fe up to 82% (25 mg/L), 77.8% (100 mg/L) and 32% (250 mg/L). This promising result indicates that the native bacteria isolated from the environment pose a great potential for the remediation of wastewater containing iron.
... Due to adopting liquid-phase chemical reduction with hydroquinone as a reductant, the produced nano-silver wastewater had a high COD concentration as well as a high level of color. The indicators are listed including 14380 mg/l COD concentration, 9270 degree color, and pH value 10.5 (Qunchao Wang et al., 2019) Wastewater management: Regarding the management policies, the Ministry of Natural Resources and Environment (MONRE) has issued a number of decrees, as well as circulars on planning, lake regulations, and registration of waste sources owners as Decree 18/2015; 80/2006 enforced by Vietnamese government; Circular and Decision of MONRE: 35/2015;12/2006;23/2006;125/2003. In addition, MONRE also set out some criteria to assess water sources such as Vietnamese Standard (QCVN) 11: 2015;QCVN 40: 2011;QCVN 39: 2011;QCVN 40: 2011. ...
The state of water pollution and its treatment in Vietnam is very alarming and it directly affects lives of the people and countries' economy on many fields, especially agriculture, which is the main production sector of the country. The main solutions to improve the current situation are to invest in construction of wastewater treatment systems and plants and promoting propaganda activities. Diem Thuy wastewater treatment plant is one of the large wastewater treatment and reuse plants in Vietnam with a capacity of 3000 m 3 / day. The amount of treated wastewater, which contains a huge amount of nutrients for plants, can ensures sufficient supply for 180 ha of agricultural land every year. Fertilizing substances, phosphorus and nitrogen, received from wastewater are worth accordingly 16 million VND and 35 million VND. Using treated water for watering the crops would save local farmers about 50 million VND per year. It is suggested to encourage research and application of simple and affordable wastewater treatment methods, based on biotechnology, at small and medium production facilities.
Due to the problems of cuprous chloride resolution and low copper activity in traditional copper slag dechlorination process, depth dechlorination by copper slag valence regulation of synergistic high-activity copper in the ultrasonic field was proposed. According to a series of conditional experiments, the optimal dechlorination parameters under ultrasonic conditions are as follows: the molar ratio of Cu:Zn:Cl is 3:2:1, the chlorine concentration can be reduced from 440 to 15 mg/L at 30 minutes, 50 °C and 30 g/L acidity, and the dechlorination efficiency is 96.6 pct. Compared with conventional and ultrasonic dechlorination, ultrasonic dechlorination can reduce the amount of copper slag by 56.67 pct and zinc powder by 68.1 pct to achieve low consumption and high-efficiency dechlorination. Ultrasonic dechlorination, because of its cavitation, the mechanical effect can accelerate and deepen the reaction process and can achieve a high standard of deep chlorine removal purpose, has a broad prospect in the industrial field.Graphical abstract
This study aimed to synthesize green tea nano zero-valent iron (GT-NZVI) and bentonite-supported green tea nano zero-valent iron (B-GT-NZVI) nanoparticles using green tea extracts in an environmentally sustainable way. Bentonite was used as a support material because it disperses and stabilizes GT-NZVI, and it helps to reduce the cost, increase the adsorption capacity of GT-NZVI, and decrease the optimum amount of GT-NZVI used in Fenton-like oxidation. A scanning electron microscope, atomic force microscopy, and a Fourier transform infrared spectroscope were used to characterize GT-NZVI and B-GT-NZVI, while the zeta potential was measured to evaluate the stability of iron nanoparticles. The decolorization kinetics of reactive blue 238 (RB 238) dye in the aqueous phase in the Fenton-like oxidation process were investigated as well. The effects of various experimental conditions such as reaction time, dosages of catalysts, concentration of H2O2, temperature, addition of inorganic salts, and other parameters were investigated. The results show that the oxidative degradation efficiencies of RB 238 dye catalyzed by GT-NZVI and B-GT-NZVI were 93.5% and 96.2%, respectively, at the optimum reaction conditions as follows: c(H2O2) = 5 mmol/L, ρ(GT-NZVI) or ρ(B-GT-NZVI) = 0.5 g/L, c(RB 238 dye) = 0.05 mmol/L, and pH = 2.5 at 180 min. The best catalytic performance was exhibited when B-GT-NZVI was used. Three kinetic models were employed, and the second-order model was found to be the best model representing the experimental kinetic data of RB 238 dye. The value of activation energy decreased from 38.22 kJ/mol for GT-NZVI to 14.13 kJ/mol for B-GT-NZVI. This indicates that the effect of B-GT-NZVI in decreasing the energy barrier is more pronounced than that of the GT-NZVI catalyst, leading to improved Fenton-like oxidation processes.
