Heavy metal removal in an UASB-CW system treating municipal wastewater

Varga, D. de la; Díaz, Mario; Ruíz, I.; Soto, M.

doi:10.1016/j.chemosphere.2013.07.043

Cited by 33 publications

(16 citation statements)

References 16 publications

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“…Accordingly, it may be necessary and recommended to remove heavy metals from sludge samples before agricultural application. Our recommendation is supported by the work of [32] who investigated the long-term removal of heavy metals in a combined up-flow anaerobic sludge bed system treating municipal wastewater and revealed that high removal efficiencies were found for some metals in the following order: Sn > Cr > Cu > Pb > Zn > Fe (63% -94%) and medium removal efficiencies for Ni (49%), Hg (42%), and Ag (40%), and finally Mn and As showed negative percentage removals. Further support come from the results of [33] who studied the retention of heavy metals at two pilot-scale treatment wetlands, consisting of two vertical flow beds followed by a horizontal flow bed and revealed that a major removal pathway was sedimentation and adsorption onto soil substrate as well as precipitation and co-precipitation.…”

Section: Concentration Of Heavy Metalsmentioning

confidence: 82%

Cations and Anions in Sewage Sludge from Gaza Waste Water Treatment Plant

El-Nahhal¹,

Al-Najar²,

El‐Nahhal³

2014

AJAC

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This paper determined cations and anions concentrations, Total Kjeldahl Nitrogen (TKN), and heavy metals content in sewage sludge collected from the drying beds of wastewater treatment plant in Gaza. The aim was to test the possibility of using this sewage sludge as an alternative source of mineral fertilizers. Many instruments were used in this work: flame photometry (K, Na), EDTA titration (Ca, Mg), the turbidity method ( )

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Section: Concentration Of Heavy Metalsmentioning

confidence: 82%

Cations and Anions in Sewage Sludge from Gaza Waste Water Treatment Plant

El-Nahhal¹,

Al-Najar²,

El‐Nahhal³

2014

AJAC

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“…The use of NWPF as a bio-bed in the UASB enhanced the biomass entrapment, increased the surface area and reduced the sludge washout [9]. These results are better than that obtained by De la Varga et al [12], where the percentage removal of COD was 51.7 %, BOD 5 43.04 % and TSS 77.5 %. Also, the results revealed that residual ammonia concentration increased in the effluent of H-UASB.…”

Section: Performance Of the Treatment System Without Cr (Vi) Additionmentioning

confidence: 59%

Bio-immobilization of Cr (VI) and its Impact on the Performance of a Pilot Scale Anaerobic Sludge Reactor Treating Municipal Wastewater

Abou‐Elela

Fawzy

El-Sorogy³

et al. 2018

Egypt. J. Chem.

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T HIS study aimed to emphasize the effect of hexavalent chromium Cr (VI) on the performance of a pilot scale hybrid up-flow anaerobic sludge blanket (H-UASB). The system was packed with non-woven polyester fabric (NWPF) and continuously fed with real municipal wastewater at a hydraulic retention time (HRT) 7.5 h and average organic loading rate (OLR) 1.24 Kg COD m 3 /d. The system achieved satisfactory removal rates for total suspended solids (TSS) (86.44 %), chemical oxygen demand (COD) (74.18 %) and biological oxygen demand (BOD 5) (84.8%) without the addition of Cr (VI). Results indicated that feeding the reactor with different concentrations of chromium ions ranged from 0.1-1.3 mg/l (i.e: 600 mg / m 3. d to 6000 mg / m 3. d) decreased the residual concentration of Cr (VI) in the final effluent to 0.019 mg/l, while the accumulation of chromium ion increased in the biobed (160 mg/kg) and in excess sludge (165.44 mg/kg). This was due to the biological reduction of Cr (VI) to Cr (III) by the action of sulphate and chromate reducing bacteria. Increasing the concentration of Cr (VI) up to 6000 mg / m 3. d reduce the biochemical reactions of the anaerobic microorganisms and consequently decrease the removal efficiency of TSS from 86.44% to 62.06, COD from 74.2 % to 57.07 % and BOD 5 from 84.8% to 61.92%.

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“…The results indicated removals of the metals in the following order: Sn > Cr > Cu > Pb > Zn > Fe (63-94%) [25]. Furthermore, according to the authors, medium removal efficiencies were achieved for Ni (49%) and Hg (42%).…”

Section: Systematization Of Phenological Aspects For Implementation Omentioning

confidence: 86%

“…A research performed by de la Varga et al [25] investigated the removal of heavy metals from municipal wastewater by using the integration of UASB + SFCW + SSFCW. The results indicated removals of the metals in the following order: Sn > Cr > Cu > Pb > Zn > Fe (63-94%) [25].…”

Section: Systematization Of Phenological Aspects For Implementation Omentioning

confidence: 99%

Constructed Wetlands Integrated with Advanced Oxidation Processes in Wastewater Treatment for Reuse

Machado

Lourenço

Kist

et al. 2015

The Handbook of Environmental Chemistry

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The development of integrated systems for wastewater treatment has been investigated in recent years not only for the improvement of control parameters but also to allow the routine reuse of wastewater to be effectively implemented. Several studies also seek to add processes that may reuse by-products, energy, and unit operations in a single integrated remediation unit. Considering the sustainability scenario, all these processes should be designed and controlled with description of scope, mass inventory, and energy demand in order to establish indexes of environmental pressure. Classical publications of books and articles for wastewater treatment have already described to more than 10 years several procedures and standards for reuse (direct or indirect), segregation at source, required treatment levels, groundwater recharge, combination of remediation processes, logistics, and sanitation. In this case, further investigation to decentralized systems, such as reed bed filters, with reduced costs of implementation and operation is required, as well as the simplicity of units to be installed. This tendency of integrated phytoremediation systems supports the growing interest for the combination of a system already considered classic in wastewater treatment, the constructed wetlands (CWs), with advanced oxidation processes (AOPs), particularly the photocatalysis with direct or indirect use of solar energy. Because of its already reported disinfection and detoxification potentials which might enable the reuse of urban wastewaters for some specific purposes, the photocatalytic treatment was selected for a study of case. So, this chapter covers the phenological aspects of a macrophyte still little used in phytoremediation, the Hymenachne grumosa; the evolution of the combined use of Upflow Anaerobic Sludge Blanket systems (UASB) + CWs; and the integration of the processes UASB + CWs + UV /TiO 2 /O 3 with indirect use of solar energy in photoreactors designed for these studies.

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Heavy metal removal in an UASB-CW system treating municipal wastewater

Cited by 33 publications

References 16 publications

Cations and Anions in Sewage Sludge from Gaza Waste Water Treatment Plant

Cations and Anions in Sewage Sludge from Gaza Waste Water Treatment Plant

Bio-immobilization of Cr (VI) and its Impact on the Performance of a Pilot Scale Anaerobic Sludge Reactor Treating Municipal Wastewater

Constructed Wetlands Integrated with Advanced Oxidation Processes in Wastewater Treatment for Reuse

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