A Study on Phosphate Removal Efficiency by Pre-Treatment Conditioning of Oyster Shells

2018 ◽  
Vol 24 (2) ◽  
pp. 196-202 ◽  
Author(s):  
Hee-Eun Woo ◽  
◽  
Kyeongmin Kim ◽  
In-Cheol Lee ◽  
Kyunghoi Kim
Keyword(s):  
Removal Efficiency ◽  
Phosphate Removal ◽  
Pre Treatment

Treatment of local scrubber wastewater for semiconductor by using photo-catalytic ozonation

2009 ◽  
Vol 59 (11) ◽  
pp. 2281-2286 ◽  
Author(s):  
Chung-Yi Chou ◽  
Chien-Pin Huang ◽  
Neng-Chou Shang ◽  
Yue-Hwa Yu
Keyword(s):  
Ion Exchange ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Catalytic Ozonation ◽  
Acidic Condition ◽  
Buffer Solution ◽  
Toc Removal ◽  
Pre Treatment ◽  
Alkaline Buffer Solution

This study investigates the oxidation of local scrubber wastewater (LSW) from semiconductor manufacture by using ozonation, catalytic ozonation (ozone/Al2O3 and ozone/TiO2–Al2O3), and photo-catalytic ozonation (UV/TiO2–Al2O3, ozone/UV and ozone/UV/TiO2–Al2O3). The results show that catalyst Al2O3 and TiO2–Al2O3 promotes the TOC removal under the condition of neutral or alkaline buffer solution during catalytic ozonation of LSW. The Al2O3 induces highest promotion in TOC removal efficiency, which is higher than ozone alone by 26% TOC removal under alkaline buffer solution. However, TiO2–Al2O3 and Al2O3 cannot display the promotion in TOC removal under acidic condition. In addition, a pre-treatment of anion ion-exchange is employed and the result indicates that decreasing the anion ions concentration before AOPs can imply higher TOC removal during AOPs of LSW. In this study, ozone/UV under raw LSW acidic condition and ozone/Al2O3 under alkaline buffer solution present 95% and 88% TOC removal rate respectively and show the higher TOC removal efficiency than other AOPs. Therefore, these two kinds of AOP can serve as the very viable AOP methods in the LSW reclamation for semiconductor.

Evaluation and thermodynamic calculation of ureolytic magnesium ammonium phosphate precipitation from UASB effluent at pilot scale

2012 ◽  
Vol 65 (11) ◽  
pp. 1954-1962 ◽  
Author(s):  
E. Desmidt ◽  
K. Ghyselbrecht ◽  
A. Monballiu ◽  
W. Verstraete ◽  
B. D. Meesschaert
Keyword(s):  
Removal Efficiency ◽  
Pilot Plant ◽  
Saturation Index ◽  
Ammonium Phosphate ◽  
Phosphate Removal ◽  
Operational Cost ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Ph Increase ◽  
High Phosphate

The removal of phosphate as magnesium ammonium phosphate (MAP, struvite) has gained a lot of attention. A novel approach using ureolytic MAP crystallization (pH increase by means of bacterial ureases) has been tested on the anaerobic effluent of a potato processing company in a pilot plant and compared with NuReSys® technology (pH increase by means of NaOH). The pilot plant showed a high phosphate removal efficiency of 83 ± 7%, resulting in a final effluent concentration of 13 ± 7 mg · L−1 PO4-P. Calculating the evolution of the saturation index (SI) as a function of the remaining concentrations of Mg2+, PO4-P and NH4+ during precipitation in a batch reactor, resulted in a good estimation of the effluent PO4-P concentration of the pilot plant, operating under continuous mode. X-ray diffraction (XRD) analyses confirmed the presence of struvite in the small single crystals observed during experiments. The operational cost for the ureolytic MAP crystallization treating high phosphate concentrations (e.g. 100 mg · L−1 PO4-P) was calculated as 3.9 € kg−1 Premoved. This work shows that the ureolytic MAP crystallization, in combination with an autotrophic nitrogen removal process, is competitive with the NuReSys® technology in terms of operational cost and removal efficiency but further research is necessary to obtain larger crystals.

Treatment of petrochemical wastewater by UV/H2O2 photodecomposed system

1997 ◽  
Vol 36 (12) ◽  
pp. 357-365 ◽  
Author(s):  
Lain-Chuen Juang ◽  
Dyi-Hwa Tseng ◽  
Shyh-Chaur Yang
Keyword(s):  
Small Molecules ◽  
Removal Efficiency ◽  
Aromatic Compounds ◽  
Biological Process ◽  
Tertiary Treatment ◽  
Petrochemical Wastewater ◽  
Activity Inhibition ◽  
High Alkalinity ◽  
Pre Treatment ◽  
Raw Wastewater

The potential advantages of the UV/H2O2 process treating petrochemical wastewater as the tertiary treatment or the direct pre-treatment were demonstrated. While the high alkalinity of wastewater was not reduced, the UV/H2O2 process as the tertiary treatment could not obtain removal efficiency of wastewater. If the system pH adjusts to 3, this process will polish the effluent of the current biological process to meet the National Effluent Standards of 1998. The results of the direct pre-treatment with the UV/H2O2 process revealed that the recalcitrant compounds presented in raw wastewater would be destroyed to small molecules and might reduce some degree of activity inhibition to bioculture. In the detoxified investigation of spiking aromatic compounds, this process could obtain a good removal efficiency, including a lot of COD removal and the complete detoxification.

Two examples of anaerobic pre-treatment of wastewater in the beverage industry

1997 ◽  
Vol 36 (2-3) ◽  
pp. 311-319 ◽  
Author(s):  
Ute Austermann-Haun ◽  
Karl-Heinz Rosenwinkel
Keyword(s):  
Removal Efficiency ◽  
Fruit Juice ◽  
Anaerobic Treatment ◽  
Full Scale ◽  
Cod Removal ◽  
Load Variations ◽  
Cod Removal Efficiency ◽  
Beverage Industry ◽  
Pre Treatment ◽  
Uasb Reactors

Two examples of full scale UASB-reactors in a fruit juice factory and a brewery are given. In both cases, the design was based on semi-technical tests. Although the wastewater concentrations are rather similar and move within a low range, the parts of the anaerobic treatment plants and their design are different. In both cases, the COD removal efficiency in the UASB-reactors is consistently above 80%. It becomes apparent that UASB-reactors are very suitable for industries with seasonal load variations. The co-fermentation of a kieselguhre-sludge-mixture was tested in lab-scale experiments. It became obvious that the pellet structure of the biomass gets lost. Furthermore, it is shown that the running expenses of anaerobic pre-treatment are very low, even when combined with an aerobic stage.

Effect of Environment Factors on Phosphorus Removal Efficiency of Phosphate Reduction System

2011 ◽  
Vol 255-260 ◽  
pp. 2797-2801
Author(s):  
Chen Yao ◽  
Chun Juan Gan ◽  
Jian Zhou
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Removal Rate ◽  
Mass Rearing ◽  
Phosphate Removal ◽  
Environment Factors ◽  
Reduction System ◽  
Initial Ph ◽  
The Impact

Effect of environment factors such as initial pH value, dissolved oxygen (DO) and temperature on phosphorus removal efficiency of phosphate reduction system was discussed in treating pickled mustard tube wastewater. Results indicate that environment factors have significant influence on dephosphorization efficiency. And, the impact of DO on phosphate reduction is mainly by affecting the distribution of micro-environment inner biofilm, manifest as phosphate removal rate decreased with a fall in DO concentration, while overhigh DO can lead to detachment of biofilm, thus causing the increase of effluent COD concentration, and so DO need to be controlled in the range of 6 mg/L. Moreover, a higher temperature is more beneficial to phosphorus removal by PRB. Unfortunately, exorbitant temperature can result in mass rearing of Leuconostoc characterized with poor flocculability in reactor, and that cause turbidity in effluent appeared as a rise in COD of effluent. Hence, the optimal temperature is found to be about 30°C.

Dairy wastewater treatment in a moving bed biofilm reactor

2002 ◽  
Vol 45 (12) ◽  
pp. 321-328 ◽  
Author(s):  
G. Andreottola ◽  
P. Foladori ◽  
M. Ragazzi ◽  
R. Villa
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Biofilm Reactor ◽  
Dairy Wastewater ◽  
Production Cycle ◽  
Nutrient Loads ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Pre Treatment ◽  
High Concentrations

Dairy raw wastewater is characterised by high concentrations and fluctuations of organic matter and nutrient loads related to the discontinuity in the cheese production cycle and machinery washing. The applicability of a Moving Bed Biofilm Reactor (MBBR) filled with FLOCOR-RMP® plastic media to the treatment of dairy wastewater was evaluated in a pilot-plant. COD fractionation of influent wastewater, MBBR performance on COD and nutrient removal were investigated. A removal efficiency of total COD over 80% was obtained with an applied load up to 52.7 gCOD m−2 d−1 (corresponding to 5 kgCOD m−3d−1). The COD removal kinetics for the MBBR system was assessed. The order of the kinetics resulted very close to half-order in the case of a biofilm partially penetrated by the substrate. The nitrogen removal efficiency varied widely between 13.3 and 96.2% due to the bacterial synthesis requirement. The application of a MBBR system to dairy wastewater treatment may be appropriate when upgrading overloaded activated sludge plants or in order to minimise reactor volumes in a pre-treatment.

The Aeration Time Influence on the Brewery Wastewater Treatment in SBR

2011 ◽  
Vol 183-185 ◽  
pp. 1200-1203
Author(s):  
Jun Sheng Li ◽  
Zhi Wei Zhao ◽  
Jin Long Zuo
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Removal Rate ◽  
Phosphate Removal ◽  
Experimental Result ◽  
Brewery Wastewater ◽  
Aeration Time

The effect s of aeration time on the treatment of brewery wastewater in SBR reactor were investigated by using synthetic brewery wastewater. The experimental result indicates that under the condition of influent COD is 300～650mg/L, the temperature is 25°C, continual aerations is 2.5 h and sludge density is 2000～3000 mg/L, the reactor has a good degeneration ability of COD and NH4+-N in simulation brewery wastewater，removal rate can reached 90 % or more，phosphate removal efficiency was above 70%. so the SBR technology is feasible．

Development of Novel Filter Materials for the Treatment of First-Flush Rainwater

2011 ◽  
Vol 695 ◽  
pp. 219-222
Author(s):  
Ree Ho Kim ◽  
Hana Kim ◽  
Jung Hun Lee ◽  
Sang Ho Lee
Keyword(s):  
Removal Efficiency ◽  
Rainwater Harvesting ◽  
Metal Removal ◽  
Wood Fiber ◽  
Heavy Metal Removal ◽  
Phosphate Removal ◽  
Dust Particles ◽  
Particle Removal ◽  
First Flush ◽  
Filter Materials

First-flush rainwater is of great interest in the research on urban environmental protection and rainwater harvesting. It deteriorates the chemical, physical, and microbiological quality of the collected/stored water as well as the water body in an urban area. Accordingly, effective and economic treatment of first-flush rainwater is highly required. This study aimed to develop a technology for the treatment of first-flush rainwater using new filters made of wood fiber mat, dental cotton, and feldspar. The removal of pollutants in first-flush rainwater with each filter material was evaluated. Experiments were carried out using an artificial rainwater solution made of road dust particles (less than 200 um small) and D.I. water that contained ionic species. The SS concentration of the solution was set between 30 and 150 mg/L. Prior to the experiments, the fiber materials were pretreated with NaOH, FeCl3, and Al2O3. The batch test results indicated that the phosphate removal efficiency of the wood fiber mat was 8.6%; of the dental cotton, 34.7%; and of the feldspar, 1.7%. On the other hand, the heavy metal removal efficiency of the wood fiber mat was 91%; of the dental cotton, 26%; and of the feldspar, 0%. The highest cation exchange capacity of the wood fiber mat that was pretreated with NaOH was attributed to the existence of carboxyl and hydroxyl functional groups in the wooden polymers. Combinations of filter materials were found to have been effective in removing particles in the rainwater. The combination of the wood fiber mat with polyethylene beads resulted in 97-98% particle removal. Other combinations such as DP (dental cotton and polyethylene beads), MF (wood fiber mat and feldspar), and DF (dental cotton and feldspar) showed particle removal rates of 90-95%, 84-96%, and 87-94%, respectively. After 30 minutes, all the combinations had a particle removal rate of over 90%.

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