Physico-chemical Treatment Processes

2005 ◽  
pp. 557-593
Keyword(s):  
Chemical Treatment ◽  
Treatment Processes ◽  
Physico Chemical

Removal efficiency of 66 pharmaceuticals during wastewater treatment process in Japan

2008 ◽  
Vol 57 (1) ◽  
pp. 65-71 ◽  
Author(s):  
T. Okuda ◽  
Y. Kobayashi ◽  
R. Nagao ◽  
N. Yamashita ◽  
H. Tanaka ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Chemical Treatment ◽  
Biological Treatment ◽  
Total Concentration ◽  
Biological Nutrient Removal ◽  
Treatment Processes ◽  
Physico Chemical ◽  
The Individual ◽  
Ozonation Process

Both biological treatment processes including conventional activated sludge (CAS) and biological nutrient removal (BNR) processes, and physico–chemical treatment processes including ozonation process and Title 22 process consisting of coagulation, sedimentation and filtration followed by UV or chlorination disinfection after the above biological processes, were compared from the viewpoint of removal efficiency. 66 pharmaceuticals including antibiotics, analgesics, psychoneurotic agents were measured with SPE-LC/MS/MS. 26 compounds out of 66 were detected in the influent ranging ng/L to μg/L order. Particularly, disopyramide, sulpiride, and dipyridamole that have been rarely detected before in the WWTP, occurred at concentration levels of more than 100 ng/L. The total concentration of the individual pharmaceuticals in the influent was efficiently removed by 80% during the biological treatment. But removal efficiencies of carbamazepine and crotamiton were less than 30%. The total concentration of the individual pharmaceuticals in the effluent from CAS process was 1.5 times higher than that from BNR process. Further, the total concentration of the individual pharmaceuticals in the discharge from WWTPs applying ozonation following activated sludge process was reduced to less than 20%. Physico–chemical treatment train called Title 22 treatment after CAS could not efficiently remove the pharmaceuticals. However, ozonation process followed by biological activated carbon process could efficiently reduce all the residual pharmaceuticals below their quantification limits.

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

The effect of physico-chemical treatment in reducing Listeria monocytogenes biofilms on lettuce leaf surfaces

Biofouling ◽  
2021 ◽  
pp. 1-13
Author(s):  
Md. Furkanur Rahaman Mizan ◽  
Hye Ran Cho ◽  
Md. Ashrafudoulla ◽  
Junbin Cho ◽  
Md. Iqbal Hossain ◽  
...  
Keyword(s):  
Listeria Monocytogenes ◽  
Chemical Treatment ◽  
Physico Chemical ◽  
Leaf Surfaces

Combined biological and physico-chemical treatment of filtered pig manure wastewater: pilot investigations

2002 ◽  
Vol 45 (12) ◽  
pp. 79-87 ◽  
Author(s):  
S. Kalyuzhnyi ◽  
V. Sklyar ◽  
A. Epov ◽  
I. Arkhipchenko ◽  
I. Barboulina ◽  
...  
Keyword(s):  
Chemical Treatment ◽  
Inorganic Nitrogen ◽  
Ammonia Removal ◽  
Uasb Reactor ◽  
Pig Manure ◽  
Fluidised Bed ◽  
Ambient Temperatures ◽  
Effluent Quality ◽  
Physico Chemical ◽  
Final Effluent

Combined biological and physico-chemical treatment of filtered pig manure wastewater has been investigated on the pilot installation operated under ambient temperatures (15-20°C) and included: i) UASB-reactor for elimination of major part of COD from the filtrate; (ii) stripper of CO2 + fluidised bed crystallisator for phosphate (and partially ammonia) removal from the anaerobic effluents in the form of insoluble minerals - struvite (MgNH4PO4) and hydroxyapatite (Ca5(PO4)3OH); (iii) aerobic-anoxic biofilter for polishing the final effluent (elimination of remaining BOD and nutrients). Under overall hydraulic retention time (HRT) for the system of 7.8 days, the total COD, inorganic nitrogen and total phosphorous removals were 88, 65 and 74%, respectively. A decrease of the overall HRT to 4.25 days led to 91, 37 and 82% removals for total COD, inorganic nitrogen and total phosphorus removals, respectively. The approaches for further improvement of effluent quality are discussed.

Physico-chemical treatment applied to compost liquor: Feasibility study

2012 ◽  
Vol 18 (4) ◽  
pp. 1522-1528 ◽  
Author(s):  
Jérémy Gagnaire ◽  
Laurent Chapon ◽  
Philippe Moulin ◽  
Benoît Marrot
Keyword(s):  
Feasibility Study ◽  
Chemical Treatment ◽  
Physico Chemical
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