Electrocoagulation of synthetic dairy wastewater

Smoczyński, L.; Muńska, Kamilla Teresa; Pierożyński, Bogusław

doi:10.2166/wst.2012.585

Cited by 13 publications

(11 citation statements)

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“…Coagulation of organics onto the Fe(OH) 3 flocs, reduction at the cathode or oxidation with active chlorine explain the decay in TOC, TN, TSS and turbidity. The post-treatment of the EC-treated wastewater, conditioned at pH 3.0, by PEF at 100-mL scale showed the highest TOC (14) EC TOC = 1000 E cell I t VΔ(TOC) exp removal using a non-active BDD anode, because of the high oxidation power of BDD( • OH). In contrast, the TN decayed much more rapidly with active anodes because of the effective attack of active chlorine onto N-compounds.…”

Section: Discussionmentioning

confidence: 99%

“…Greater effectiveness has been achieved by means of electrochemical technologies. However, little information is still available on their use, being limited to either single electrocoagulation (EC) with Fe or Al anodes [14][15][16][17][18][19], EC coupled with chemical Fenton and ozonation [20] and electro-oxidation (EO) with Pt [21] or dimensionally stables anodes (DSA ® ) [3,22]. More research is then needed to clarify the feasibility of sequential electrochemical processes for treating cheese whey wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Treatment of cheese whey wastewater by combined electrochemical processes

et al. 2018

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This study shows the good performance of a sequential electrochemical methodology, consisting in electrocoagulation (EC) followed by an electrochemical advanced oxidation process (EAOP), to treat raw cheese whey wastewater at laboratory and pre-pilot scales. In EC, different electrode materials like Fe, Al and stainless steel (AISI 304 and ASI 316L) were tested. Among EAOPs, photoelectro-Fenton (PEF) and electrochemical oxidation (EO) with active anodes like Pt or DSA ® and non-active ones like boron-doped diamond (BDD) were studied. At both scales, the optimum anode/cathode combination in EC was Fe/AISI 304, which yielded the highest total organic carbon (TOC) removal of 22.0-27.0%. This is due to various effects on organic compounds: (i) coagulation promoted by Fe(OH) 3 flocs, (ii) cathodic reduction, and (iii) oxidation with generated active chlorine. At small scale, the resulting wastewater was further treated by PEF at pH 3.0. The highest TOC removal was achieved using the BDD, owing to the great oxidation power of hydroxyl radicals. In contrast, total nitrogen was abated much more rapidly with active anodes because of the attack of active chlorine on N-compounds. At pre-pilot scale, the post-treatment of conditioned wastewater made by EO with a BDD/Pt flow cell combined with UVA irradiation yielded the highest TOC removal, i.e., 49.1%. The high energy consumed by the UVA lamp would be a drawback at industrial scale, which could be overcome by using sunlight.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Treatment of cheese whey wastewater by combined electrochemical processes

et al. 2018

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“…The process was performed at a constant current of I = 0.1 A and changes in voltage were continuously registered ( Figure 1 (b)). The direction of the current was alternated automatically every 256 s [ 28 , 29 ] to clean the electrodes. A sewage sample of 1 L was re-circulated within 64 min.…”

Section: Methodsmentioning

confidence: 99%

Modelling the structure of sludge aggregates

Smoczyński

Ratnaweera

Kosobucka

et al. 2015

Environmental Technology

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The structure of sludge is closely associated with the process of wastewater treatment. Synthetic dyestuff wastewater and sewage were coagulated using the PAX and PIX methods, and electro-coagulated on aluminium electrodes. The processes of wastewater treatment were supported with an organic polymer. The images of surface structures of the investigated sludge were obtained using scanning electron microscopy (SEM). The software image analysis permitted obtaining plots log A vs. log P, wherein A is the surface area and P is the perimeter of the object, for individual objects comprised in the structure of the sludge. The resulting database confirmed the ‘self-similarity’ of the structural objects in the studied groups of sludge, which enabled calculating their fractal dimension and proposing models for these objects. A quantitative description of the sludge aggregates permitted proposing a mechanism of the processes responsible for their formation. In the paper, also, the impact of the structure of the investigated sludge on the process of sedimentation, and dehydration of the thickened sludge after sedimentation, was discussed.

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“…The removal of neutral or positively-charged pollutants takes place during the so-called flocculation [1,5,10]. This mechanism dominates also in the case of wastewater treatment by electrocoagulation [11][12][13], particularly during recirculating electrolysis of wastewater [14].…”

Section: Introductionmentioning

confidence: 99%

Study of Sludge Particles Formed during Coagulation of Synthetic and Municipal Wastewater for Increasing the Sludge Dewatering Efficiency

Smoczyński

Kalinowski

Creţescu

et al. 2019

Water

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Municipal wastewater sludge was produced by chemical coagulation of synthetic wastewater (sww) based on Synthene Scarlet P3GL disperse dye and real municipal wastewater (nww), coagulated by commercial coagulants PAX (prepolymerised aluminum coagulant) and PIX (a ferric coagulant based on Fe2(SO4)3). An attempt was made to correlate the sludge’s dewatering capacity (in terms of capillary suction time—CST) with operation parameters for wastewater treatment, size distribution and specific surface area of the sludge particles. It was found that the presence of phosphate ions in the system facilitates the removal efficiency of the above-mentioned dye (L) due to the interaction between the dye molecules and H2PO4− ions. Unlike sww, negatively charged organic substances (sorg) in nww are directly adsorbed on the surface of colloidal particles {Fe(OH)3} and {Al(OH)3} (prtc). It was also discovered that an increase in the dose of a coagulant led to an increase of CST for sww sludge and to a decrease of CST for nww sludge. It has been suggested that flocs composed of spherical {Al(OH)3} units possessed more internal space for water than aggregates consisting of rod-shaped {Fe(OH)3} units and, consequently, it is more difficult to remove water from Al-sww sludge than from Fe-sww. The results obtained showed that smaller particles dominate in sww sludge, while larger particles are prevalent in nww sludge. To explain this distinct difference in the size distribution of particles in sludge obtained with the use of Al3+ and Fe3+, simple models of aggregation and agglomeration-flocculation processes (aaf) of treated wastewater have been proposed. Except for PIX in nww, the analyzed particles of the investigated types of sludge were characterized by similar specific surface area (Sps), regardless of the kind of sludge or the applied coagulant. Slightly larger, negatively-charged sorg bridges, anchored directly on the surface of positive prtc are more effective in closing the structure of nww sludge than small L bridges of the dye molecules anchored on the surface of prtc via H2PO4−. All the discovered aspects could lead to improved performance of wastewater treatment plants (WWTP) by increasing the efficiency of sludge dewatering.

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Electrocoagulation of synthetic dairy wastewater

Cited by 13 publications

References 0 publications

Treatment of cheese whey wastewater by combined electrochemical processes

Treatment of cheese whey wastewater by combined electrochemical processes

Modelling the structure of sludge aggregates

Study of Sludge Particles Formed during Coagulation of Synthetic and Municipal Wastewater for Increasing the Sludge Dewatering Efficiency

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