Influence of Backwashing Time on Iron, Manganese, Ammonia and Turbidity Removal Using a Pilot-Scale Biological Filter

2013 ◽  
Vol 807-809 ◽  
pp. 1097-1102
Author(s):  
Qing Feng Cheng ◽  
Dong Li ◽  
Xiang Kun Li ◽  
Ling Wei Meng ◽  
Jie Zhang
Keyword(s):  
Removal Efficiency ◽  
Pilot Scale ◽  
Average Concentration ◽  
Total Iron ◽  
Operational Parameters ◽  
Turbidity Removal ◽  
Biological Filter ◽  
The Media ◽  
Iron Manganese

Backwashing time is one of the most critical operational parameters for biological filter. In order to investigate the effect of backwashing time on iron, manganese, ammonia and turbidity removal, three backwashing time (5 min, 4 min and 3 min) were adopted. Results showed that the average concentration of total iron, manganese and ammonia in effluent was 0.025 mg/L, 0.007 mg/L, and 0.022 mg/L; 0.012 mg/L, 0.001 mg/L and 0.017 mg/L; 0.013 mg/L, 0.000 mg/L and 0.016 mg/L, respectively, which illustrated varying backwashing time had little influence on the removal efficiency of them. The turbidity in effluent was 0.28 NTU, 0.38 NTU, 0.57 NTU, respectively. The shorter backwashing time, the higher turbidity in effluent. Turbidity was almost completely removed in 0~0.4m of the media. After backwashing, the turbidity in effluent was decreased to less than 1 NTU in 40 min, droped to less than 0.5 NTU in 90 min.

Stormwater runoff treatment filtration system and backwashing system

2019 ◽  
Vol 79 (4) ◽  
pp. 771-778 ◽  
Author(s):  
Junho Lee ◽  
Myungjin Lee
Keyword(s):  
Particle Size ◽  
Removal Efficiency ◽  
Recovery Rate ◽  
Stormwater Runoff ◽  
Pilot Scale ◽  
Solid Loading ◽  
Filter Media ◽  
Turbidity Removal ◽  
Filtration System ◽  
Combined Sewer

Abstract This study has been carried out to evaluate the applicability of the pilot scale hybrid type of stormwater runoff treatment system for treatment of combined sewer overflow. Also, to determine the optimum operation parameter such as coagulation dosage concentration, effectiveness of coagulant usage, surface loading rate and backwashing conditions. The pilot scale stormwater filtration system (SFS) was installed at the municipal wastewater plant serving the city of Cheongju (CWTP), Korea. CWTP has a capacity of 280,000 m3/day. The SFS consists of a hydrocyclone coagulation/flocculation with polyaluminium chloride silicate (PACS) and an upflow filter to treat combined sewer overflows. There are two modes (without PACS use and with PACS use) of operation for the SFS. In case of no coagulant use, the range of suspended solids (SS) and turbidity removal efficiency were 72.0–86.6% (mean 80.0%) and 30.9–71.1% (mean 49.3%), respectively. And, the recovery rate of filter was 79.2–83.6% (mean 81.2%); the rate of remaining solid loading in filter media was 16.4–20.8% (mean 18.8%) after backwashing. The influent turbidity, SS concentrations were 59.0–90.7 NTU (mean 72.0 NTU), 194.0–320.0mg/L (mean 246.7mg/L), respectively. The range of PACS dosage concentration was 6.0–7.1mg/L (mean 6.7mg/L). The range of SS and turbidity removal efficiency was 84.9–98.2 (mean 91.4%) and 70.7–96.3 (mean 84.0%), respectively. It was found that removal efficiency was enhanced with PACS dosage. The recovery rate of filter was 92.0–92.5% (mean 92.3%) the rate of remaining solid loading in filter media was 6.1–8.2% (mean 7.2%) after backwashing. In the case of coagulant use, the particle size of the effluent is bigger than influent particle size. The results showed that SFS with PACS use more effective than without PACS use in SS and turbidity removal efficiency and recovery rate of filter.

Impact of operational parameters on biofiltration performance: organic carbon removal and effluent turbidity

2016 ◽  
Vol 16 (6) ◽  
pp. 1683-1692 ◽  
Author(s):  
Vivek A. Nemani ◽  
Lizbeth Taylor-Edmonds ◽  
Nicolas M. Peleato ◽  
Robert C. Andrews
Keyword(s):  
Energy Consumption ◽  
Surface Water ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Contact Time ◽  
Lake Ontario ◽  
Pilot Scale ◽  
Operational Parameters ◽  
Turbidity Removal ◽  
The Impact

The objectives of this pilot-scale study were to optimize backwash frequency and empty bed contact time (EBCT) of biofilters treating ozonated surface water from Lake Ontario. Performance was benchmarked in terms of the reduction of turbidity, dissolved organic carbon (DOC), disinfection by-product (DBP) precursors, and ultrafiltration foulants (biopolymers). Increasing the EBCT from 4 to 8 min resulted in a higher reduction of DOC (5%), trihalomethane (THM4) and haloacetic acid (HAA9) precursors (∼12%) without negatively impacting effluent turbidity (consistently below 0.4 NTU), while biopolymer removal remained unaffected (2%). The impact of varying backwash frequency (5, 10, and 25 day intervals) was also compared for biofilters operated at an EBCT of 4 min. Results showed no impact of extended run times (up to 25 days) on DOC or DBP precursor removal; however turbidity removal was affected beyond 15 days of operation. Backwashing biofilters at 10 vs 5 day intervals would result in a reduction of backwash water, energy consumption and amount to nearly $17,000 in savings for the utility.

Performance of Anoxic-Anaerobic Oxidation Ditch for Nutrient Removal under Low Temperature Condition

2012 ◽  
Vol 518-523 ◽  
pp. 1776-1779
Author(s):  
Lin Lin Bao ◽  
Qing Feng Cheng ◽  
Dong Li ◽  
Jie Zhang
Keyword(s):  
Low Temperature ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Pilot Scale ◽  
Average Concentration ◽  
Anaerobic Oxidation ◽  
Oxidation Ditch ◽  
Operational Parameters ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal

Temperature was a very important factor affecting the efficiency of biological nitrogen and phosphorus removal, as temperature sharply affecting the biological activity of biomass. A pilot-scale anoxic-anaerobic oxidation ditch (OD) process was used to investigate the efficiency of organic, nitrogen and phosphorus removal under the low temperature condition in this study. The results indicated that the nitrification and COD removal was very sensitive to the temperature changing, but the TP removal was not sensitive. When the temperature decreased from 25 degrees Celsius to15 degrees Celsius, the water quality of the effluent deteriorated obviously. A high removal rate of COD, TN, NH4+-N and TP was achieved at temperature of 15 degrees Celsius by changing the operational parameters in this study. The average concentration of COD, TN, NH4+-N and TP in effluent was 26.2 mg/L, 12.1 mg/L, 3.9 mg/L and 0.34 mg/L respectively.

scholarly journals The effect of the application of halotolerant microorganisms on the efficiency of a pilot-scale constructed wetland for saline wastewater treatment

2010 ◽  
Vol 75 (1) ◽  
pp. 129-142 ◽  
Author(s):  
Milana Karajic ◽  
Ales Lapanje ◽  
Jaka Razinger ◽  
Alexis Zrimec ◽  
Danijel Vrhovsek
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Saline Wastewater ◽  
Ammonium Removal ◽  
The Media ◽  
Design Characteristics ◽  
Higher Sensitivity

In order to find the optimal design characteristics of constructed wetlands for saline wastewater treatment, halotolerant microorganisms, isolated from the water of the Secovlje salterns, were inoculated into the media of a pilot-scale constructed wetland (CW). The purpose of this study was to examine the influence of different salinities on the efficiency of halotolerant microorganisms for the removal of pollutants in order to evaluate the possibility of their employment for saline wastewater treatment. The efficiency of ammonium removal (34.1 %) was the highest with 0 % NaCl in wastewater and slightly lower (31.8 %) when 2 g/dm3 saccharose was added to aerated 1.5 % NaCl wastewater. The highest removal efficiency of chemical oxygen demand (COD) in the pilot-scale subsurface flow (SSF) CW was 83.6 % when saccharose (2 g/dm3) was added to aerated 1.5 % NaCl wastewater. It was found that removal efficiency of the pilot-scale constructed wetland with inoculated halotolerant microorganisms showed a higher sensitivity to aeration and the presence of saccharose than to variation of the salinity of the wastewater. It can be concluded that halotolerant microorganisms, isolated from the Secovlje salterns, are not sensitive to the changes in salinity and are, therefore, an alternative in the treatment of saline wastewater with a constructed wetland. However, with aeration their efficiency could be further improved.

Factors affecting phosphorus removal in two biofilter system treating wastewater from car-washing facility

2000 ◽  
Vol 41 (4-5) ◽  
pp. 487-492 ◽  
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Phosphorus Removal ◽  
Phosphorus Content ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Aerobic Condition ◽  
Suspended Solid ◽  
Nitrogen Loading ◽  
Operational Parameters ◽  
Factors Affecting ◽  
Biological Filter

A two-biofilter system operated under alternating anaerobic/aerobic conditions was tested to remove nutrient as well as organics from wastewater generated from car-washing facility. The wastewater was characterized by relatively low organic and high phosphorus content. The factors affecting phosphorus removal in the two-biofilter system were investigated. Operational parameters examined in this study were hydraulic retention time, organic, suspended solid and nitrogen loading rate. The factors affecting phosphorus removal in biological filter appeared to be influent COD, COD/T–P, BOD/COD, nitrogen, and SS/T–P. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorus removal by the two-biofilter system. The biomass wasted during backwash procedure also affected total phosphorus removal by the system.

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.

Effects of operational parameters on defluoridation efficiency using electrocoagulation process

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
M. Behbahani ◽  
M.R. Alavi Moghaddam ◽  
M. Arami
Keyword(s):  
Reaction Time ◽  
Anode Material ◽  
Removal Efficiency ◽  
Fluoride Concentration ◽  
Fluoride Removal ◽  
Operational Parameters ◽  
Applied Current ◽  
Initial Ph ◽  
Electrocoagulation Process ◽  
Electrode Connection

The aim of this study is to examine the effect of operational parameters on fluoride removal using electrocoagulation method. For this purpose, various operational parameters including initial pH, initial fluoride concentration, applied current, reaction time, electrode connection mode, anode material, electrolyte salt, electrolyte concentration, number of electrodes and interelectrode distance were investigated. The highest defluoridation efficiency achieved at initial pH 6. In the case of initial fluoride concentration, maximum removal efficiency (98.5%) obtained at concentration of 25mg/l. The increase of applied current and reaction time improved defluoridation efficiency up to 99%. The difference of fluoride removal efficiencies between monopolar and bipolar series and monopolar parallel were significant, especially at reaction time of 5 min. When aluminum used as anode material, higher removal efficiency (98.5%) achieved compared to that of iron anode (67.7%). The best electrolyte salt was NaCl with the maximum defluoridation efficiency of 98.5% compared to KNO3 and Na2SO4. The increase of NaCl had no effect on defluoridation efficiency. Number of electrodes had little effect on the amounts of Al3+ ions released in the solution and as a result defluoridation efficiency. Almost the same fluoride removal efficiency obtained for different interelectrode distances.

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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