Utilization of zeolite industrial wastewater for removal of copper and zinc from copper-brass pipe industrial wastewaterA paper submitted to the Journal of Environmental Engineering and Science.

2009 ◽  
Vol 36 (4) ◽  
pp. 709-719 ◽  
Author(s):  
Siranee Sreesai ◽  
Suthipong Sthiannopkao
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Ph Value ◽  
Oxygen Demand ◽  
Sorption Isotherms ◽  
Freundlich Equation ◽  
Metals Removal ◽  
Removal Efficiencies ◽  
The Relationship ◽  
Cu And Zn

Utilization of zeolite industrial wastewater as a sorbent and (or) precipitant to remove Cu and Zn from copper-brass pipe industrial wastewater was conducted. These wastewaters were sampled and values for pH, temperature, biochemical oxygen demand (BOD5), chemical oxygen demand (COD), total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), and heavy metals were determined. In addition, the sorption isotherms of Cu and Zn in copper-brass pipe industrial wastewater onto solids of zeolite industrial wastewater at various dilutions of copper-brass pipe industrial wastewater were explored. The relationship between Cu and Zn concentrations and their removal efficiencies under different conditions of wastewater pH, contact times, and ratios between copper-brass pipe industrial wastewater and zeolite industrial wastewater was examined. Zeolite industrial wastewater contained various carbonate compounds that contributed to high pH and TDS values, and low heavy metals contamination whereas copper-brass pipe industrial wastewater had a low pH value and was contaminated with heavy metals, especially Cu and Zn. Application of zeolite industrial wastewater significantly increased the pH of copper-brass pipe industrial wastewater and consequently removed Cu and Zn. The increase in pH of the wastewater mixture significantly enhanced the heavy metals removal. The Langmuir equation described sorption isotherms of Cu and Zn onto solids of zeolite industrial wastewater at neutral pH (6–7) while the Freundlich equation fitted well at pH > 12. The maximum Cu (97%–98%) and Zn (92%–96%) removal efficiencies occurred at the original pH 12.8 of zeolite industrial wastewater, at the ratio of copper-brass pipe industrial wastewater to zeolite industrial wastewater 3:1 (vol.:vol.) and at 30 min contact time.

Heavy Metals (Cu and Zn) Release Kinetics in a Sediment Sample from the Inlet of Baihua Lake, China

2012 ◽  
Vol 599 ◽  
pp. 81-85
Author(s):  
Ji Ping Zhang ◽  
Ji Wei Hu ◽  
Xian Fei Huang ◽  
Jin Mei ◽  
Wei Shen ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sediment Sample ◽  
Ph Value ◽  
Release Kinetics ◽  
Relationship Of ◽  
The Relationship ◽  
Kinetics Of ◽  
Best Fit ◽  
Metals Release ◽  
Cu And Zn

Release kinetics of two selected heavy metals (Cu and Zn) in a sediment sample collected from the inlet of Baihua Lake was determined. The results show that the double-constant equation was considered as the best-fit equations describing the relationship of Cu and Zn release and time in the sediment from the inlet of the lake (R2 = 0.9759, 0.9226, P<0.01). The effects of temperature, acidity, salinity, and the water/soil ratio on the releasing of heavy metals in sediment sample were also investigated. The heavy metals release would increase as the temperature increased. A low pH value could promote the heavy metals release. The heavy metals in the sediment tended to be released under a relatively high salinity condition. The amount of the heavy metals released from the sediment decreased with the increase of the water/soil ratio.

scholarly journals Enhanced removal of nutrients and heavy metals from domestic-industrial wastewater in an academic campus of Hanoi using modified hybrid constructed wetlands

2020 ◽  
Vol 82 (10) ◽  
pp. 1995-2006
Author(s):  
Mai Huong ◽  
Dan-Tam Costa ◽  
Bui Van Hoi
Keyword(s):  
Heavy Metals ◽  
Water Quality ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Aquatic Ecosystems ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Outdoor Experiment ◽  
Removal Efficiencies ◽  
Cyperus Alternifolius

Abstract Vietnam, like many developing countries, is facing serious water quality issues due to discharging wastewaters without treatment or with improper treatment, which can constitute a potential risk for aquatic ecosystems, food safety and human health. Hybrid constructed wetlands with four substrate layers (HCW) and modified hybrid constructed wetland (MHCW-1 and MHCW-2) with seven substrate layers were designed to evaluate the enhanced treatment capacity for wastewaters. To this end, we carried out an outdoor experiment at the Vietnam Academy of Science and Technology, Vietnam to treat its wastewaters from April to August 2019. All constructed wetland units were planted with reed Phragmites australis and cyperus Cyperus alternifolius; and specifically wetland MHCW-2 was cultured with earthworm Perionys excavates. Results indicated that MHCW-1 and MHCW-2 with seven substrate layers had higher removal efficiencies of -N, TKN and TP than HCW system. More substrate layers in MHCW-1 and MHCW-2 also resulted in increase of Cu and Pb removal efficiencies, with 73.5%, 79.4%, 71.5% and 67.8%, respectively. Particularly, earthworm addition in MHCW-2 was more efficient in decreasing the concentrations of biochemical oxygen demand (BOD5), with removal efficiency over 70%.

Technological Trends in Heavy Metals Removal from Industrial Wastewater: A Review

2021 ◽  
pp. 105688
Author(s):  
Rakesh Shrestha ◽  
Sagar Ban ◽  
Sijan Devkota ◽  
Sudip Sharma ◽  
Rajendra Joshi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Industrial Wastewater ◽  
Heavy Metals Removal ◽  
Metals Removal

Hydroponics reducing effluent's heavy metals discharge

2009 ◽  
Vol 59 (1) ◽  
pp. 175-183 ◽  
Author(s):  
Abdellah Rababah ◽  
Ahmad Al-Shuha
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Value Added ◽  
Treated Wastewater ◽  
Hydroponic System ◽  
Heavy Metals Removal ◽  
Treated Effluent ◽  
Metals Removal ◽  
Nutrient Film Technique ◽  
Removal Efficiencies

This paper investigates the capacity of Nutrient Film Technique (NFT) to control effluent's heavy metals discharge. A commercial hydroponic system was adapted to irrigate lettuces with primary treated wastewater for studying the potential heavy metals removal. A second commercial hydroponic system was used to irrigate the same type of lettuces with nutrient solution and this system was used as a control. Results showed that lettuces grew well when irrigated with primary treated effluent in the commercial hydroponic system. The NFT-plant system heavy metals removal efficiency varied amongst the different elements, The system's removal efficiency for Cr was more than 92%, Ni more than 85%, in addition to more than 60% reduction of B, Pb, and Zn. Nonetheless, the NFT-plants system removal efficiencies for As, Cd and Cu were lower than 30%. Results show that lettuces accumulated heavy metals in leaves at concentrations higher than the maximum acceptable European and Australian levels. Therefore, non-edible plants such as flowers or pyrethrum are recommended as value added crops for the proposed NFT.

Fe3O4/cyclodextrin polymer nanocomposites for selective heavy metals removal from industrial wastewater

2013 ◽  
Vol 91 (1) ◽  
pp. 322-332 ◽  
Author(s):  
Abu Zayed M. Badruddoza ◽  
Zayed Bin Zakir Shawon ◽  
Wei Jin Daniel Tay ◽  
Kus Hidajat ◽  
Mohammad Shahab Uddin
Keyword(s):  
Heavy Metals ◽  
Polymer Nanocomposites ◽  
Industrial Wastewater ◽  
Heavy Metals Removal ◽  
Cyclodextrin Polymer ◽  
Metals Removal

scholarly journals Adsorption of Heavy Metals from Industrial Wastewater using Nanoparticles from Agro Wastes

2021 ◽  
Author(s):  
Lekan Taofeek Popoola ◽  
Alhaji Shehu Grema
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Industrial Wastewater ◽  
Activated Carbons ◽  
Textural Properties ◽  
Isotherm Models ◽  
Heavy Metals Removal ◽  
Adsorption Mechanisms ◽  
Body Tissues ◽  
Metals Removal

Effluents from essential industries have been characterized with heavy metals which are non-biodegradable in nature and also detrimental to health when accumulated in body tissues over long exposure. Adsorption was proved as the best efficient process amongst others to remove these heavy metals from industrial wastewater due to its excellent features. Activated carbons from nanoparticles of agricultural wastes such as pods, shells, husks, peels, shafts and many prepared via calcination process at high temperature can be used as active adsorbent for the industrial wastewater treatment involving heavy metals removal. This chapter discusses heavy metals in industrial wastewater effluents and potential agro wastes from which nanoparticles of activated carbon for industrial wastewater purification could be generated. The transformation of agro wastes nanoparticles into activated carbons via calcination and their applications for heavy metals removal from industrial wastewater via adsorption were examined. Various characterization techniques to study the effects of calcination on structural, morphological and textural properties of activated carbon prepared from agro waste nanoparticles were also discussed. Various isotherm, kinetics, mechanistic and thermodynamics models to investigate the adsorptive nature of the process were presented. Error functions and algorithms for both the linear and non-linear isotherm models regression to affirm their fitness for prediction were presented. Lastly, proposed adsorption mechanisms of heavy metals removal from industrial wastewater using activated carbons from nanoparticles of agro wastes were presented.

scholarly journals An A2O-MBR system for simultaneous biological nitrogen and phosphorus removal from brewery wastewater at various nitrate recirculation ratios

2021 ◽  
Vol 258 ◽  
pp. 08011
Author(s):  
Van Nu Thai Thien ◽  
Dang Viet Hung ◽  
Nguyen Thi Thanh Hoa ◽  
Thi Ha Nguyen ◽  
Phan Thanh Trong
Keyword(s):  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Organic Loading Rate ◽  
Brewery Wastewater ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Operational Conditions ◽  
Solids Retention ◽  
Removal Efficiencies ◽  
Biological Nitrogen

Anaerobic/Anoxic/Oxic – Membrane BioReactor (A2O-MBR) system including A2O unit at short solids retention time (SRT) for accumulation of PO43--P and MBR at long SRT for nitrification of NH4+-N was used to enhance simultaneous removal of nitrogen and phosphorus from brewery wastewater. The model of A2O-MBR system made from polyacrylic with the capacity of 49.5 liters was operated with organic loading rate of 0.75 kgCOD/m3.day. Nitrate recycling ratio was increased from 100 to 300% while sludge recirculation ratio was maintained at 100%. The results showed that for the nitrate recycling ratios of 100, 200, 300%, average NH4+-N and total nitrogen (TN) removal efficiencies of the model were 95.7 and 72.4, 99.2 and 86.7, 99.3 and 89.6%, respectively. The removal efficiencies of chemical oxygen demand (COD) and total phosphorus (TP) were over 90 and 75%, respectively, regardless of nitrate recirculation ratio. The output values of COD, NH4+-N, TN and TP were within the limits of Vietnam National Technical Regulation on Industrial Wastewater (QCVN 40:2011/BTNMT), column A, throughout the experiments. The model with recommended system configuration and optimum operational conditions could treat not only nitrogen but also phosphorus well due to appropriate nitrate recycling ratios.

scholarly journals Chemical precipitation of heavy metals from wastewater by using the synthetical magnesium hydroxy carbonate

2020 ◽  
Vol 81 (6) ◽  
pp. 1130-1136 ◽  
Author(s):  
Yue Zhang ◽  
Xiumei Duan
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Ph Value ◽  
Metallurgical Industry ◽  
Chemical Precipitation ◽  
Raw Material ◽  
Low Grade ◽  
Heavy Metal Wastewater ◽  
Removal Efficiencies ◽  
Hydroxy Carbonate

Abstract Heavy metal pollution has become one of the most serious environmental problems today. The preparation of magnesium hydroxy carbonate from low-grade magnesite, and the chemical precipitation of heavy metal wastewater with magnesium hydroxy carbonate as precipitating agent were undertaken. The removal efficiencies of heavy metals were improved by increasing the dose of magnesium hydroxy carbonate, and the applicable dose of magnesium hydroxy carbonate was 0.30 g for 50 mL of the wastewater (6,000 mg/L). The precipitation reactions proceeded thoroughly within 20 min. At this time, the removal efficiencies of heavy metals were above 99.9%. The final pH value was 7.1, the residual VO2+, Cr3+ and Fe3+ concentrations were 0.01, 0.05 and 1.12 mg/L, respectively, which conformed to the limit of discharge set by China (0.5–2.0 mg/L, GB 8978–1996). The precipitate was mainly composed of Fe2O3, V2O5 and Cr2O3, which can be recycled as secondary raw material for metallurgical industry. The treatment of the heavy metal wastewater with magnesium hydroxy carbonate was successful in decreasing the concentrations of VO2+, Cr3+ and Fe3+ in wastewater.

scholarly journals Implementation of Modified Acacia Tannin by Mannich Reaction for Removal of Heavy Metals (Cu, Cr and Hg)

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 352 ◽  
Author(s):  
Lorena Lugo ◽  
Alison Martín ◽  
John Diaz ◽  
Alejandro Pérez-Flórez ◽  
Crispin Celis
Keyword(s):  
Heavy Metals ◽  
Mannich Reaction ◽  
Industrial Wastewater ◽  
Oxygen Demand ◽  
Direct Mercury Analyzer ◽  
Removal Of Heavy Metals ◽  
Mercury Analyzer ◽  
Flocculation Process ◽  
Different Levels ◽  
Different Doses

The modified tannin by Mannich reaction was investigated for wastewater treatment. The removal of heavy metals, such as copper, chromium and mercury, in industrial wastewater was evaluated through the coagulation–flocculation technique, using modified Acacia tannin (MAT) as a coagulant agent. The successful tannin modification was evaluated by infrared spectopometry (FTIR), nuclear magnetic resonance (NMR); monitoring the removal of heavy metals was performed by atomic absorption (AA) and a direct mercury analyzer (DMA). Additionally, the parameters of water quality, total suspended solids (TSS), turbidity and chemical oxygen demand (COD) were assessed. Different doses of MAT were evaluated (375 ppm, 750 ppm, 1250 ppm and 1625 ppm) and three different levels of pH (4, 7 and 10). The highest percentages of removal obtained were copper 60%, chromium 87%, mercury 50%–80%, COD 88%, TSS 86% and turbidity 94%, which were achieved with the dose of 375 ppm of MAT at pH 10. The coagulation–flocculation process with the modified Acacia tannin is efficient for the removal of conventional parameters and for a significant removal of the metals studied.

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