Pilot study on advanced treatment of geosmin and 2-MIB with O3/GAC

2018 ◽  
Vol 19 (4) ◽  
pp. 1253-1263 ◽  
Author(s):  
Siying Chen ◽  
Bingzhi Dong ◽  
Kuo Gao ◽  
Tian Li
Keyword(s):  
Removal Efficiency ◽  
Algal Blooms ◽  
Conventional Treatment ◽  
Lake Taihu ◽  
Pilot Scale ◽  
Advanced Treatment ◽  
Strengthening Effect ◽  
Sand Filtration ◽  
Practical Applications ◽  
Scale Experiment

Abstract The removal efficiencies of geosmin/2-MIB by conventional treatment (flocculation, sedimentation and sand filtration) combined with advanced treatment (ozonation and granular activated carbon (GAC) filtration) in a pilot-scale experiment were investigated in a comprehensive manner. The objective of this study is to provide useful information for practical applications to solve the taste and odor problem during algal blooms in Lake Taihu. Results showed that the conventional treatment removed 38–59% and 36–64% of 2-MIB and geosmin, respectively, with ozone dosage from 0 to 1.0 mg/L. In particular, the increase in ozone concentration promoted the removal of 2-MIB/geosmin by sand filtration, meanwhile lowering the odorant removal efficiency by GAC filtration, with the key reason being the higher biomass produced in the sand filter through the strengthening effect of the ozonation. The organics with higher molecular weight (MW) showed the most significant decline in the pre-ozonation process with 1.0 mg/L ozone dosage, resulting in an enhanced removal efficiency of 2-MIB/geosmin by pre-ozonation. With ozone dosage of 1.0 mg/L, geosmin and 2-MIB in the treated water were 0.1 and 3.85 ng/L, respectively, which were below their odor threshold concentrations (OTCs) with the preliminary concentration of ∼200 ng/L of 2-MIB/geosmin.

scholarly journals Phycoremediation of contaminated water by cadmium (Cd) using two cyanobacterial strains (Trichormus variabilis and Nostoc muscorum)

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Mona M. Abd El-Hameed ◽  
Mohamed E. Abuarab ◽  
Nadhir Al-Ansari ◽  
Shady Abdel Mottaleb ◽  
Gomaa A. Bakeer ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Growth Parameters ◽  
Algal Growth ◽  
Pilot Scale ◽  
Nostoc Muscorum ◽  
Contaminated Water ◽  
Natural Ecosystems ◽  
Toxic Impact ◽  
Scale Experiment ◽  
Trichormus Variabilis

Abstract Background Water pollution with heavy metals is a severe dilemma that concerns the whole world related to its risk to natural ecosystems and human health. The main objective was to evaluate the removal efficiency of Cd of various concentrations from contaminated aqueous solution by use of two cyanobacterial strains (Nostoc muscorum and Trichormus variabilis). For this purpose, a specially designed laboratory pilot-scale experiment was conducted using these two cyanobacterial strains on four different initial concentrations of Cd (0, 0.5, 1.0 and 2.0 mg L−1) for 21 days. Results N. muscorum was more efficient than T. variabilis for removing Cd (II), with the optimum value of residual Cd of 0.033 mg L−1 achieved by N. muscorum after 21 days with initial concentration of 0.5 mg L−1, translating to removal efficiency of 93.4%, while the residual Cd (II) achieved by T. variabilis under the same conditions was 0.054 mg L−1 (89.13% removal efficiency). Algal growth parameters and photosynthetic pigments were estimated for both cyanobacterial strains throughout the incubation period. Conclusions High Cd concentration had a more toxic impact on algal growth. The outcomes of this study will help to produce treated water that could be reused in agrarian activities.

Assimilable organic carbon (AOC) originating from picophytoplankton in drinking water

2006 ◽  
Vol 6 (2) ◽  
pp. 169-176 ◽  
Author(s):  
T. Okuda ◽  
W. Nishijima ◽  
M. Okada
Keyword(s):  
Drinking Water ◽  
Removal Efficiency ◽  
Drinking Water Treatment ◽  
Quality Standard ◽  
Pilot Scale ◽  
Aluminium Chloride ◽  
Residual Chlorine ◽  
Sand Filtration ◽  
Removal Ratio ◽  
Coagulant Dosage

The removal efficiency of conventional drinking water for picophytoplankton and the contribution of picophytoplankton to AOC were investigated in this research. The removal ratio during coagulation–sedimentation step was determined by jar test using PAC (poly-aluminium chloride). Lower coagulation pH showed better picophytoplankton removal in coagulation–sedimentation. The optimum coagulant dosage for picophytoplankton was twice or more than that for turbidity. The removal efficiency of picophytoplankton was 44–60% at lowest pH in water quality standard (5.8) and at an optimum coagulant dosage for turbidity. The removal ratio of picophytoplankton in rapid sand filtration was determined by pilot scale column experiments with sand and anthracite. The average removal percentage was 16.3% without PAC addition and chlorination before sand filtration; on the other hand it was 51.5% with PAC and chlorination. AOC increased by the chlorination of picoplankton including 6,800 cells/L of picophytoplankton was 21 μg-acetateC/L at 0.1 mg/L of residual free chlorine. The AOC was increased by the increase of residual chlorine concentration, and leveled off at 0.3 mg-Cl/L. From the result, the AOC originating from picoplankton (maximum AOC from picophytoplankton) could increase up to 155 μg-acetateC/L in this reservoir. It indicates that the removal of picoplankton (picophytoplankton) in drinking water treatment process is important from the viewpoint of AOC control.

A novel electrospun polyurethane nanofibre membrane – production parameters and suitability for wastewater (WW) treatment

2014 ◽  
Vol 69 (7) ◽  
pp. 1496-1501 ◽  
Author(s):  
Jaroslav Lev ◽  
Marek Holba ◽  
Michal Došek ◽  
Libor Kalhotka ◽  
Přemysl Mikula ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Laboratory Experiments ◽  
Treatment Plant ◽  
Pilot Scale ◽  
E Coli ◽  
Bacterial Removal ◽  
Colony Forming Units ◽  
Scale Experiment ◽  
Artificial Water ◽  
Better Than

The aim of this study was to investigate the suitability of a novel electrospun polyurethane nanofibre material for water-treatment purposes. Bacterial removal efficiency was tested in the laboratory by filtering artificial water spiked with Escherichia coli through a 0.25 µm nanofibre membrane. The results were compared with those obtained using a commercial microfiltration material (MV020T) with a similar pore size (0.20 µm). Alongside the laboratory experiments, we also determined filtration efficiency with semi-pilot scale experiments using actual wastewater from the secondary sedimentation tank of a wastewater treatment plant. The laboratory experiments indicated very high log10 removal efficiency, ranging from 5.8 to 6.8 CFU (colony-forming units)/ml. These results were better than those of the commercial membrane (3.8–4.6 CFU/ml). The semi-pilot scale experiment confirmed the membrane's suitability for microbial filtration, with both E. coli and total culturable microorganisms (cultured at both 22 and 36 °C) showing a significant decline compared to the non-filtered control (wastewater from the secondary outlet).

Removal of organics and nutrients from tannery effluent by advanced integrated wastewater pond systems technology

2003 ◽  
Vol 48 (2) ◽  
pp. 307-314 ◽  
Author(s):  
I. Tadesse ◽  
S.A. Isoaho ◽  
F.B. Green ◽  
J.A. Puhakka
Keyword(s):  
Removal Efficiency ◽  
Pilot Scale ◽  
Ammonia Removal ◽  
Organic Loading Rate ◽  
Tannery Effluent ◽  
Organic Loading ◽  
Organics Removal ◽  
In Series ◽  
Removal Efficiencies ◽  
Scale Experiment

In this study, a pilot-scale experiment was carried out on a pre-settled combined tannery effluent from Modjo tannery, Ethiopia, to evaluate the feasibility of the Advanced Integrated Wastewater Pond Systems® or AIWPS® Technology, for the treatment of tannery effluent. The pilot-scale AIWPS® Facility was comprised of an Advanced Facultative Pond (AFP), Secondary Facultative Pond (SFP) and Maturation Pond (MP) all arranged in series. Three feed phases with low, moderate and overloading organic loading rates were applied to assess the organics and nutrients removal performances of the AIWPS® reactors. The overall organics removal performance of the AIWPS® Process was high, with removal efficiencies in the range of 90-98% for BOD5 and 86-92% for COD. Among the AIWPS® reactors, the AFP attained the highest organics removal efficiency with a BOD5 removal of 70-89%. BOD5 removal efficiencies of the SFP and MP were 34-65% and 30-40%, respectively. The AFP was also able to withstand a much higher volumetric organic loading rate (70% more) than the conventional open anaerobic ponds. The drop in BOD5 removal efficiency of the AFP at the overloading condition was only 7%, while the corresponding drop in the SFP was 29%. AIWPS® reactors achieved a cumulative ammonia removal efficiency of 85%. The highest ammonia removal (50-60%) occurred in the SFP, followed by the MP with removal efficiency of 20-26%. At the overloading condition the overall ammonia removal efficiency of the AIWPS® Facility decreased by 50%, while the BOD5 organics removal dropped by only 6%, signifying the higher vulnerability of ammonia removal mechanism to high loading conditions than the organics removal. The phosphorus removal in the AIWPS® Facility was erratic, with highest removal (up to 75%) occurring in the AFP. The lack of H2S odour nuisance from the AFP was mainly due to the proliferation of sulphide oxidizing anoxygenic photosynthetic pink bacteria of the genera: Thiocystis, Rhodobacter, Rhodospirillum and Rhodopseudomonas in the upper solar illuminated water layers of the AFP.

Removal of Dissolved Organic Nitrogen (DON) in Waterwork and it’s Correlation with Water Qualities

2012 ◽  
Vol 610-613 ◽  
pp. 2445-2450
Author(s):  
Chen Yan Hu ◽  
Jing Zhang ◽  
Zhen Xing Zhou ◽  
Fei Shang
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Removal Efficiency ◽  
Dissolved Organic Nitrogen ◽  
Conventional Treatment ◽  
Organic Nitrogen ◽  
Linear Regression Analysis ◽  
Advanced Treatment ◽  
Rapid Sand Filtration ◽  
Advanced Treatments

Removal of dissolved organic nitrogen (DON) were investigated in treatment line including conventional treatments (coagulation, sedimentation and rapid sand filtration) and advanced treatments (pre-ozonation, high density clarification and V-filter) in Yangshupu waterwork. The correlation between DON and water qualities including UV254, DOC, NO3--N, NH4+-N and SUVA in water samples were studied as well. According to the results, removal efficiency of DOC, UV254 and DON after conventional treatment were 25.1%, 43.3% and 31.1% respectively. Pre-ozonation could increase the concentration of DON in samples. Removal efficiency of DOC, UV254 and DON were 24.5%, 40.2% and 29.6%, respectively, after the advanced treatment. The results from linear regression analysis showed that DON is moderately correlated to UV254 and DOC, with the correlatition confficent of 0.807 and 0.775 respectively. However, DON showed slightly correlated with NO3--N, NH4+-N and SUVA.

Advanced treatment for taste and odour control in drinking water: case study of a pilot scale plant in Seoul, Korea

2007 ◽  
Vol 55 (5) ◽  
pp. 111-116 ◽  
Author(s):  
W.H. Joe ◽  
I.C. Choi ◽  
Y.A. Baek ◽  
Y.J. Choi ◽  
G.S. Park ◽  
...  
Keyword(s):  
Drinking Water ◽  
Removal Efficiency ◽  
Tap Water ◽  
Pilot Scale ◽  
Chlorine Concentration ◽  
Advanced Treatment ◽  
Raw Water ◽  
Han River ◽  
Odour Control

Taste and odour problems of tap water in Seoul are attributed to 2-methylisoborneol (2-MIB) and trans-1,10-dimethyl-trans-9-decalol (geosmin), which are the result of metabolism of algae and chlorine for disinfection. This study was carried out to measure 2-MIB and geosmin in the raw water from the Han River, to investigate removal efficiency of GAC and BAC integrated with post-ozonation, and to minimise and quantify the required chlorine concentration as a final disinfectant through the candidate process.

Experimental Study on Utilization FGD Byproducts in Building Bricks

2010 ◽  
Vol 150-151 ◽  
pp. 753-757 ◽  
Author(s):  
Xiong Hao Li ◽  
Yong Jie Xue ◽  
Min Zhou
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Optimum Design ◽  
Power Plants ◽  
Pilot Scale ◽  
Mixture Composition ◽  
Technical Requirement ◽  
Do No Harm ◽  
Maximum Compressive Strength ◽  
Scale Experiment

This paper discussed the feasibility of unburned and non-autoclaved, steam cured bricks prepared by FGD byproducts from coal-fired power plants. The results show that FGD byproduct, aggregates, cementious materials and water could be used to prepare bricks during the process of stir and compaction under natural cure and steam cured condition. S4 and Z2 are the optimum design mixture composition. The maximum compressive strength and saturation coefficient are 28.7 MPa and 96.7%. FGD byproducts do no harm to environment and a pilot-scale experiment demonstrates that bricks made with FGDA can meet the MU10 level bricks technical requirement.

Enhancing nitrogen removal efficiency in a dyestuff wastewater treatment plant with the IFFAS process: the pilot-scale and full-scale studies

2017 ◽  
Vol 77 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Yanjun Mao ◽  
Xie Quan ◽  
Huimin Zhao ◽  
Yaobin Zhang ◽  
Shuo Chen ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Full Scale ◽  
Nitrification And Denitrification ◽  
Dyestuff Wastewater

Abstract The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs). The results showed that the effluent chemical oxygen demand (COD), ammonium nitrate (NH4+-N) and total nitrogen (TN) concentrations of the IFFAS process were significantly lower than those of the AS process, and could meet the indirect discharge standards. PCR-DGGE and FISH results indicated that more nitrifiers and denitrifiers co-existed in the IFFAS system, promoting simultaneous nitrification and denitrification. Based on the pilot results, the IFFAS process was used to upgrade the full-scale AS process, and the effluent COD, NH4+-N and TN of the IFFAS process were 91–291 mg/L, 10.6–28.7 mg/L and 18.9–48.6 mg/L, stably meeting the indirect discharge standards and demonstrating the advantages of IFFAS in dyestuff wastewater treatment.

scholarly journals Post-treatment of tannery wastewater using pilot scale horizontal subsurface flow constructed wetlands (polishing)

2017 ◽  
Vol 77 (4) ◽  
pp. 988-998 ◽  
Author(s):  
Tadesse Alemu ◽  
Andualem Mekonnen ◽  
Seyoum Leta
Keyword(s):  
Removal Efficiency ◽  
Batch Reactor ◽  
Subsurface Flow ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Surface Flow ◽  
Tannery Wastewater ◽  
Treated Effluent ◽  
Horizontal Subsurface Flow ◽  
Pollutants Removal

Abstract In the present study, a pilot scale horizontal subsurface flow constructed wetland (CW) system planted with Phragmites karka; longitudinal profile was studied. The wetland was fed with tannery wastewater, pretreated in a two-stage anaerobic digester followed by a sequence batch reactor. Samples from each CW were taken and analyzed using standard methods. The removal efficiency of the CW system in terms of biological oxygen demand (BOD), chemical oxygen demand (COD), Cr and total coliforms were 91.3%, 90%, 97.3% and 99%, respectively. The removal efficiency for TN, NO3− and NH4+-N were 77.7%, 66.3% and 67.7%, respectively. Similarly, the removal efficiency of SO42−, S2− and total suspended solids (TSS) were 71.8%, 88.7% and 81.2%, respectively. The concentration of COD, BOD, TN, NO3−N, NH4+-N, SO42 and S2− in the final treated effluent were 113.2 ± 52, 56 ± 18, 49.3 ± 13, 22.75 ± 20, 17.1 ± 6.75, 88 ± 120 and 0.4 ± 0.44 mg/L, respectively. Pollutants removal was decreased in the first 12 m and increased along the CW cells. P. karka development in the first cell of CW was poor, small in size and experiencing chlorosis, but clogging was higher in this area due to high organic matter settling, causing a partial surface flow. The performance of the pilot CW as a tertiary treatment showed that the effluent meets the permissible discharge standards.

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