Influence of Electrochemical Processing on the Dispersed Composition of Humic Compounds

2021 ◽  
Vol 55 (2) ◽  
pp. 78-82
Author(s):  
S. B. Selyanina ◽  
A. S. Orlov ◽  
I. N. Zubov ◽  
A. V. Kanarskii ◽  
S. V. Gavrilov ◽  
...  
Keyword(s):  
Electrochemical Processing ◽  
Humic Compounds

Development of Batch Photocatalytic Solar Reactor into a Continuous System to Degrade Peat Water into Clean Water

2018 ◽  
Vol 881 ◽  
pp. 42-47
Author(s):  
Gusfiyesi ◽  
Hendri Sawir ◽  
Edo Handika
Keyword(s):  
Degradation Products ◽  
Batch Reactor ◽  
Continuous System ◽  
Clean Water ◽  
Green Process ◽  
Photocatalytic Reactor ◽  
Solar Reactor ◽  
Humic Compounds ◽  
Batch System ◽  
Solar Uv

TiO2 film has been applied as UV-TiO2 photocatalytic batch reactor to degrade total organic carbon (TOC) in peat water for prolonged use. TOC was degraded as 99% after irradiation for six hours and water became neutral. In this study, solar UV-TiO2 photocatalytic reactor continuous system has been designed as the development of a batch system. Five reactor batches each are coated with TiO2 film that arranged vertically, filled with peat water. Peat water is drained from the top batch of reactors to the reactor batch underneath continuously by vertical pumps. The vertical pump is equipped with a flow rate regulating valve due to peat water can interact optimally with TiO2 films in each batch during the reaction. Humic compounds in peat water that absorb on TiO2 films can be degraded photocatalitically by the energy of photons from sunlight (solar). Solar continuous reactors system will be very effective and efficient to be developed to degrade peat water into clean water, for saving energy and water degradation products free of harmful chemicals due to green process.

Effects of acid rain on soil humic compounds

Talanta ◽  
2001 ◽  
Vol 54 (5) ◽  
pp. 837-846 ◽  
Author(s):  
N Calace
Keyword(s):  
Acid Rain ◽  
Humic Compounds

Assessing the potential of a UV-based AOP for treating high-salinity municipal wastewater reverse osmosis concentrate

2013 ◽  
Vol 68 (9) ◽  
pp. 1994-1999 ◽  
Author(s):  
Muhammad Umar ◽  
Felicity Roddick ◽  
Linhua Fan
Keyword(s):  
Reverse Osmosis ◽  
Municipal Wastewater ◽  
High Salinity ◽  
Oxygen Demand ◽  
Process Efficiency ◽  
Secondary Effluent ◽  
Biological Processes ◽  
Fluorescence Excitation ◽  
H2o2 Treatment ◽  
Humic Compounds

The UVC/H2O2 process was studied at laboratory scale for the treatment of one moderate (conductivity ∼8 mS/cm) and two high salinity (∼23 mS/cm) municipal wastewater reverse osmosis concentrate (ROC) samples with varying organic and inorganic characteristics. The process efficiency was characterized in terms of reduction of dissolved organic carbon (DOC), chemical oxygen demand (COD), colour and absorbance at 254 nm (A254), and the improvement of biodegradability. The reduction of colour and A254 was significantly greater than for DOC and COD for all samples due to the greater breakdown of humic compounds, as confirmed by fluorescence excitation-emission matrix spectra. Fairly small differences in the reduction of DOC (26–38%) and COD (25–37%) were observed for all samples, suggesting that the salinity of the ROC did not have a significant impact on the UVC/H2O2 treatment under the test conditions. The biodegradability of the treated ROC samples improved markedly (approximately 2-fold) after 60 min UVC/H2O2 treatment. This study indicates the potential of UVC/H2O2 treatment followed by biological processes for treating high-salinity concentrate, and the robustness of the process where the characteristics of the secondary effluent (influent to RO) and thus resultant ROC vary significantly.

Influence of hydrodynamics of electrolyte flow during electrochemical treatment on the quality of the treated surface

2021 ◽  
pp. 55-60
Author(s):  
Keyword(s):  
Electrical Conductivity ◽  
Current Density ◽  
Electrochemical Treatment ◽  
Flow Lines ◽  
Electrolyte Flow ◽  
Flow Rates ◽  
Average Flow ◽  
Electrochemical Processing ◽  
Interelectrode Gap

The features of the hydrodynamics of the electrolyte in the interelectrode gap during electrochemical processing of a profile axisymmetric workpiece are considered. The distribution of average flow rates and flow lines is calculated for a specified electrolyte supply. The nature and rate of the electrolyte flow are established. The unevenness of the current density is determined taking into account the change in the electrical conductivity of the electrolyte from heating and gas filling of the interelectrode gap, as well as the quality of the treated surface. Keywords: electrochemical treatment, roughness, electrolyte, electrical conductivity, gas filling. [email protected]

Classification of algogenic organic matter concerning its contribution to the bacterial regrowth potential and by-products formation

1998 ◽  
Vol 37 (2) ◽  
pp. 91-96 ◽  
Author(s):  
Wido Schmidt ◽  
Beate Hambsch ◽  
Heike Petzoldt
Keyword(s):  
Organic Matter ◽  
Chlorine Dioxide ◽  
Relative Increase ◽  
Residual Chlorine ◽  
Additional Increase ◽  
Bacterial Regrowth ◽  
Humic Compounds ◽  
Significant Difference ◽  
The Impact ◽  
By Products

The bacterial regrowth potential (BRP) and the by-products formation potential after the disinfection (DBP) are parameters recognized to be influenced by the origin of organic matter dissolved in water. A significant difference of the impact of humic compounds and algogenic organic matter (AOM), characteristic for raw waters from reservoirs, to both parameters can be assumed. In systematic laboratory experiments the influence of AOM on the BRP as well as DBP was examined. Different fractions of the AOM were chlorinated and treated with chlorine dioxide. In addition to that the influence of the ozonation was investigated. To assess the biodegradable fraction of the organic matter (BDOC) a large spectrum of by-products (aldehydes and keto-acids) was analyzed. The BRP in the water was determined by the measurement of the increase of biomass in the water samples. It could be proved, that the chlorination of intact algae cells containing waters may cause a significant increase of the biodegradability in the water if the residual chlorine is totally required. In the case of the disinfection of the AOM containing waters with chlorine dioxide the relative increase of the BRP was lower in comparison to the chlorinated waters. The preozonation of the algae containing waters indicates an additional increase of the BRP, but only by ozonation of the algae cells. The ozonation of the algae metabolites does not influence the BRP, but it causes a significant decrease of the THM-formation if chlorine is used for disinfection.

scholarly journals Possible mechanisms of electrochemical processing activation ARMCO-iron

2018 ◽  
Vol 224 ◽  
pp. 01009
Author(s):  
Konstantin Rakhimyanov ◽  
Nadezhda Gaar ◽  
Aleksandr Loktionov
Keyword(s):  
Laser Radiation ◽  
Current Density ◽  
Armco Iron ◽  
Water Solution ◽  
Pulse Repetition Frequency ◽  
Anode Surface ◽  
Potential Range ◽  
Electrochemical Processing ◽  
Stationary Conditions ◽  
The Impact

The peculiarities of the electrochemical dissolving of ARMCO-iron in the 15% water solution of the sodium chloride during electrochemical dissolving the material and under the impact of laser radiation with a wavelength of 1.06 micrometer are considered. The investigations were conducted at a special installation by the potentiodynamic method. It is established that the material passivation at a potential range of 1.26 – 2.6 V is observed during electrochemical dissolving the material in the stationary conditions. The increase in the value of the current density by 45 times occurs in introducing the laser radiation in the process of anode dissolving and the passivation areas are not observed. The dissolution process takes place actively in the whole range of potentials from 0 to 5 V. It is shown that the main mechanisms of laser activation of electrochemical dissolving the materials is the depassivation of the anode surface and the acceleration of electrochemical reactions. It is determined that the maximum current density is achieved during laser-electrochemical processing of ARMCO-iron at a pulse repetition frequency of laser radiation equal to 3 kHz.

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