Removal of chemical oxygen demand from ethylenediaminetetraacetic acid cleaning wastewater with electrochemical treatment

Onsite reuse of blackwater requires removal of considerable amounts of suspended solids and organic material in addition to inactivation of pathogens. Previously, we showed that electrochemical treatment could be used for effective pathogen inactivation in blackwater, but was inadequate to remove solids and organics to emerging industry standards. Further, we found that as solids and organics accumulate with repeated recycling, electrochemical treatment becomes less energetically sustainable. Here, we describe a pilot study in which concentrated blackwater is pretreated with ultrafiltration and granular activated carbon prior to electrochemical disinfection, and show that this combination of treatments removes 75-99% of chemical oxygen demand, 92-100% of total suspended solids, and improves the energy efficiency of electrochemical blackwater treatment by an order of magnitude.

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Degradation of distillery spent wash using monopolar parallel and monopolar series electrocoagulation process

Applied Research and Smart Technology (ARSTech) ◽

10.23917/arstech.v2i1.306 ◽

2021 ◽

Vol 2 (1) ◽

pp. 8-17

Author(s):

Sukanya Pujari ◽

Manoj Wagh ◽

Shila Dare

Keyword(s):

Chemical Oxygen Demand ◽

Waste Treatment ◽

Removal Rate ◽

Oxygen Demand ◽

Cost Effective ◽

Electrochemical Treatment ◽

Cod Removal ◽

Spent Wash ◽

Distillery Spent Wash ◽

The Impact

In waste treatment and water management issues, electrocoagulation (EC) is the most cost-effective and environmentally friendly option. In the study, EC treatment of distillery spent wash was carried out using new electrodes packed with aluminium foil scraps. These metal scraps were packed in a mesh to function as anode and cathode electrodes. Electrochemical treatment was carried out for 150 minutes, and samples were analysed regularly to determine the colour and chemical oxygen demand (COD). The impact of operating parameters such as pH, applied current, electrolysis time, agitation speed, and electrode distance on colour and COD removal was investigated. The EC processes were carried out in monopolar parallel (MP-P) and monopolar series (MP-S). The MP-S connection measured the potential difference between the amplified pair of electrodes, whereas the output signals in the MP-P connection were formed by several input electrodes, resulting in a high removal rate. The results indicated that the MP-P relationships enhance the COD removal rate by 4.16 to 8.06 %. An optimum chemical oxygen demand degradation is 77.29 % at pH 3, and decolourisation is 76.55 % at pH 8.3. TDS is reduced to a maximum of 58.32 %, while sulfate and chloride are reduced to 64.72 and 20.44 %, respectively.

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EDTA and electricity synergetic catalyzed Fe3 + /H2O2 process for amoxicillin oxidation

Water Science & Technology ◽

10.2166/wst.2009.356 ◽

2009 ◽

Vol 60 (3) ◽

pp. 761-770 ◽

Cited By ~ 3

Author(s):

Ting-Ting Shen ◽

Xiao-Ming Li ◽

Yu-Fang Tang ◽

Juan Wang ◽

Xiu Yue ◽

...

Keyword(s):

Chemical Oxygen Demand ◽

Infrared Spectra ◽

Oxidation Process ◽

Ethylenediaminetetraacetic Acid ◽

Synergetic Effect ◽

Oxygen Demand ◽

Biological Oxygen Demand ◽

Oxidation Processes ◽

Edta Ethylenediaminetetraacetic Acid

Three oxidation processes for amoxicillin wastewater pretreatment such as Electro-Fe3 + (EDTA)/H2O2 (EDTA: ethylenediaminetetraacetic acid), Fe3 + (EDTA)/H2O2 and Electro-Fe3 + /H2O2 were simultaneously discussed at pH of 7.0 (±0.1). It was found that the above processes could achieve 78%, 64%, 33% chemical oxygen demand (CODcr) removal, and 86%, 70%, 47% amoxicillin degradation respectively. Moreover, the results of biodegradability (biological oxygen demand (BOD5)/CODcr ratio) showed that the Electro-Fe3 + (EDTA)/H2O2 process was a promising way to pretreat antibiotic wastewater due to the biodegradability of the effluent improved to 0.48 compared with the cases of Fe3 + (EDTA)/H2O2 (0.40) and Electro-Fe3 + /H2O2 process (0.12). Therefore, it was reasonable to note that EDTA and electricity showed synergetic effect on the oxidation process. Additionally, infrared spectra (IR) were applied to concisely propose a potential degradation way of amoxicillin. The characteristic changes of H2O2 and EDTA in the oxidation process were also investigated in detail.

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Improving energy efficiency of electrochemical blackwater disinfection through sequential reduction of suspended solids and chemical oxygen demand

Gates Open Research ◽

10.12688/gatesopenres.12873.2 ◽

2019 ◽

Vol 2 ◽

pp. 50 ◽

Cited By ~ 1

Author(s):

Brian T. Hawkins ◽

Tate W. Rogers ◽

Christopher J. Davey ◽

Mikayla H. Stoner ◽

Ewan J. McAdam ◽

...

Keyword(s):

Energy Efficiency ◽

Chemical Oxygen Demand ◽

Suspended Solids ◽

Oxygen Demand ◽

Total Suspended Solids ◽

Electrochemical Treatment ◽

Pathogen Inactivation ◽

Industry Standards ◽

Order Of Magnitude ◽

Sequential Reduction

Onsite reuse of blackwater requires removal of considerable amounts of suspended solids and organic material in addition to inactivation of pathogens. Previously, we showed that electrochemical treatment could be used for effective pathogen inactivation in blackwater, but was inadequate to remove solids and organics to emerging industry standards. Further, we found that as solids and organics accumulate with repeated recycling, electrochemical treatment becomes less energetically sustainable. Here, we describe a pilot study in which concentrated blackwater is pretreated with ultrafiltration and granular activated carbon prior to electrochemical disinfection, and show that this combination of treatments removes 75-99% of chemical oxygen demand, 92-100% of total suspended solids, and improves the energy efficiency of electrochemical blackwater treatment by an order of magnitude.

Download Full-text