Application of electrochemical processes for tannery wastewater treatment

Szpyrkowicz, Lidia; Naumczyk, J.; Zilio‐Grandi, F.

doi:10.1080/02772249409358057

Cited by 53 publications

(27 citation statements)

References 4 publications

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“…In order to achieve COD, NH 4 -N and NO À 3 -N concentrations permitted for discharge, it is required that the biologically pretreated wastewater is treated either by electrolysis or by ozonation. H 2 O 2 /UV oxidation is not ef®cient.…”

Section: Discussionmentioning

confidence: 99%

“…The results are shown in Table 3. NH 4 -N and COD removal can be complete. The concentration of NH 4 -N less than 15 mg dm À3 is achieved in 30 min of electrolysis.…”

Section: Electrolysismentioning

confidence: 95%

“…NH 4 -N and COD removal can be complete. The concentration of NH 4 -N less than 15 mg dm À3 is achieved in 30 min of electrolysis. Also the COD values of less than 150 mg dm À3 are achieved in 2±3 h 0 2100 50 315 1000 1050 30 1440 8 420 870 878 60 780 0 485 790 790 120 210 0 580 670 670 180 110 0 660 630 630 2 1.15 5.8 0 2100 50 315 1000 1050 30 840 4 485 810 814 60 270 0 590 690 690 120 45 0 655 620 620 180 20 0 710 580 580 of electrolysis.…”

Section: Electrolysismentioning

confidence: 95%

“…Also the COD values of less than 150 mg dm À3 are achieved in 2±3 h 0 2100 50 315 1000 1050 30 1440 8 420 870 878 60 780 0 485 790 790 120 210 0 580 670 670 180 110 0 660 630 630 2 1.15 5.8 0 2100 50 315 1000 1050 30 840 4 485 810 814 60 270 0 590 690 690 120 45 0 655 620 620 180 20 0 710 580 580 of electrolysis. The energy consumption for the elimination of 1 kg of NH 4 -N was 320 kWh and 502 kWh respectively for the two current densities, 0.7 A dm À2 and 1.15 A dm À2 , used. Also for removing 1 kg of COD the energy consumption was 40.4 kWh and 35.8 kWh respectively for the two current densities.…”

Section: Electrolysismentioning

confidence: 99%

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Use of various processes for pilot plant treatment of wastewater from a wood‐processing factory

Αθανασόπουλος¹

2001

J of Chemical Tech & Biotech

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The wastewater from a wood-processing factory is characterized by a high COD, chlorides and nitrogen content. Various treatment processes were applied to treat this wastewater in pilot-scale units. By applying one-stage denitri®cation±activated sludge biological treatment it was not possible to remove nitrogen. Nitri®cation was inhibited by wastewater compounds. By applying a second stage of a nitri®cation bio®lter it was possible to have a high degree of nitri®cation. The denitri®cation was complete. With biological methods the reduction of COD, and NO À 3 -N and NH 4 -N concentrations to acceptable values was not achievable. Physical±Chemical methods as H 2 O 2 /UV, electrolysis and ozonation were used as post-treatment of ef¯uents from the biological system. Radical degradation, initiated by the powerful hydroxyl radicals which are generated from H 2 O 2 by UV activation, is used for wastewater post-treatment.

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Section: Discussionmentioning

confidence: 99%

“…The results are shown in Table 3. NH 4 -N and COD removal can be complete. The concentration of NH 4 -N less than 15 mg dm À3 is achieved in 30 min of electrolysis.…”

Section: Electrolysismentioning

confidence: 95%

Section: Electrolysismentioning

confidence: 95%

Section: Electrolysismentioning

confidence: 99%

See 2 more Smart Citations

Use of various processes for pilot plant treatment of wastewater from a wood‐processing factory

Αθανασόπουλος¹

2001

J of Chemical Tech & Biotech

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show abstract

“…Use of the chlorine and hypochlorite generated anodically to destroy pollutants is well known. This technique can effectively oxidize many inorganic and organic pollutants at high chloride concentration, typically more than 3 g/L (50,(110)(111)(112)(113)(114)(115)(116). The possible formation of chlorinated organic compounds intermediates or final products hinders the wide application of this technique (112).…”

Section: Indirect Eo Processesmentioning

confidence: 99%