Tertiary treatment of municipal wastewater using bioflocculating micro-algae

1991 ◽  
Vol 18 (6) ◽  
pp. 940-944 ◽  
Author(s):  
J. B. Sérodes ◽  
E. Walsh ◽  
O. Goulet ◽  
J. de la Noue ◽  
C. Lescelleur
Keyword(s):  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Ammonia Nitrogen ◽  
Design Criteria ◽  
Tertiary Treatment ◽  
Deep Basin ◽  
Sequential Batch Reactor ◽  
N Removal

Design criteria of a pilot plant for treating secondary municipal effluents using filamentous, bioflocculating micro-algae were evaluated. Using a sequential batch reactor, the best removal rate of ammonia nitrogen was reached for 25% draw volume; at 20–22 °C, up to four cycles per day could be achieved giving a removal efficiency of approximately 2 g of N per day and per square meter of basin (200 mm deep) with negligible nitrogen residual; increasing the water level by increments of 200 mm (from 200 to 600 mm) increased the N removal efficiency in a way similar to an increase in the number of renewals per day on a 200 mm deep basin. The dominant micro-algae (Chlorhormidium) was heavily influenced by the water temperature. Key words: micro-algae, municipal wastewater, water treatment, ammonia nitrogen, removal rate, removal efficiency.

scholarly journals Upflow packed bed Anammox reactor used in two-stage deammonification of sludge digester effluent

2018 ◽  
Vol 78 (9) ◽  
pp. 1843-1851 ◽  
Author(s):  
İ. Çelen-Erdem ◽  
E. S. Kurt ◽  
B. Bozçelik ◽  
B. Çallı
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Packed Bed ◽  
Municipal Wastewater Treatment ◽  
Two Stage ◽  
N Removal ◽  
Total Nitrogen Removal

Abstract The sludge digester effluent taken from a full scale municipal wastewater treatment plant (WWTP) in Istanbul, Turkey, was successfully deammonified using a laboratory scale two-stage partial nitritation (PN)/Anammox (A) process and a maximum nitrogen removal rate of 1.02 kg N/m3/d was achieved. In the PN reactor, 56.8 ± 4% of the influent NH4-N was oxidized to NO2-N and the effluent nitrate concentration was kept below 1 mg/L with 0.5–0.7 mg/L of dissolved oxygen and pH of 7.12 ± 12 at 24 ± 4°C. The effluent of the PN reactor was fed to an upflow packed bed Anammox reactor where high removal efficiency was achieved with NO2-N:NH4-N and NO3-N:NH4-N ratios of 1.32 ± 0.19:1 and 0.22 ± 0.10:1, respectively. The results show that NH4-N removal efficiency up to 98.7 ± 2.4% and total nitrogen removal of 87.7 ± 6.5% were achieved.

Effects of carbon source on N2O production in the process of simultaneous nitrification and denitrifica-tion via nitrite by aerobic granular sludge

2016 ◽  
Vol 1 (2) ◽  
pp. 10 ◽  
Author(s):  
Hong Liang ◽  
Xue Li ◽  
Shanshan Wang ◽  
Dawen Gao
Keyword(s):  
Nitrous Oxide ◽  
Carbon Source ◽  
Removal Efficiency ◽  
Release Rate ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Aerobic Granular Sludge ◽  
N Removal

A sequencing batch reactor (SBR) was used to study the effect of carbon source (C6H12O6 and CH3COONa) and C/N ratio (C/N=4:1 and C/N=7:1) on the production of nitrous oxide (N2O) in the process of simultaneous nitrifica-tion and denitrification via nitrite (short-cut SND) by aerobic granular sludge and the removal efficiency of nitrogen under low dissolved oxygen (DO). The results showed that short-cut SND occurred in this system, and the removal ef-ficiency of total nitrogen (TN) at C6H12O6 and CH3COONa were 28.93 % and 41.19 %, respectively. However, the production of N2O significantly increased when CH3COONa was used as a carbon source. In addition, the rate of N2O release when CH3COONa was a carbon source was 8.34 times the rate when C6H12O6 was the carbon source. With the increase of C/N, removal rate of TN and the efficiency of the short-cut SND were increased. The removal efficiency of TN at C/N=7:1 was 90.33%, which was 2.19 times at C/N=4:1. The percentage of short-cut SND at C/N=4:1 and C/N=7:1 were 87.47% and 95.97%, respectively. The release rate of N2O from the original 1.14 mg/(g • min) decreased to 0.10 mg/(g • min) after increased the C/N from 4:1 to 7:1.

scholarly journals Poultry Slaughterhouse Wastewater Treatment Using Submerged Fibers in an Attached Growth Sequential Batch Reactor

2018 ◽  
Vol 15 (8) ◽  
pp. 1734 ◽  
Author(s):  
Hamidi Aziz ◽  
Nur Puat ◽  
Motasem Alazaiza ◽  
Yung-Tse Hung
Keyword(s):  
Removal Efficiency ◽  
Suspended Solids ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Treatment Efficiency ◽  
Slaughterhouse Wastewater ◽  
Sequential Batch Reactor ◽  
Treated Effluent ◽  
Different Types

In this study, a sequential batch reactor (SBR) with different types of fibers was employed for the treatment of poultry slaughterhouse wastewater. Three types of fibers, namely, juite fiber (JF), bio-fringe fiber (BF), and siliconised conjugated polyester fiber (SCPF), were used. Four SBR experiments were conducted, using the fibers in different reactors, while the fourth reactor used a combination of these fibers. The treatment efficiency of the different reactors with and without fibers on biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammonia-nitrogen (NH3-N), phosphorus (P), nitrite (NO2), nitrate (NO3), total suspended solids (TSS), and oil-grease were evaluated. The removal efficiency for the reactors with fibers was higher than that of the reactor without fibers for all pollutants. The treated effluent had 40 mg/L BOD5 and 45 mg/L COD with an average removal efficiency of 96% and 93%, respectively, which meet the discharge limits stated in the Environmental Quality Act in Malaysia.

Effect on Bed Material Heights to the Performance of ZCBAF in the Treatment of Micro-Polluted Raw Water

2012 ◽  
Vol 209-211 ◽  
pp. 2053-2057
Author(s):  
Jin Xiang Liu ◽  
Shui Bo Xie ◽  
Chun Ning Cheng ◽  
Jin Sheng Lou ◽  
Shi You Li
Keyword(s):  
Removal Efficiency ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Test Results ◽  
Raw Water ◽  
Hydraulic Loading ◽  
N Removal ◽  
The Media ◽  
Aerated Filter ◽  
Bed Material

The effect of bed material heights on treatment performance of pollutants from micro-polluted raw Water was studied in zeolite - Ceramics biological aerated filter(ZCBAF) technology. The test results showed the removal rate of CODMn, NH4+-N and UV254 will improve with the increase of media height, most of CODMn and UV254 were removed within the first 440mm , when the media height over 440mm, the effect of increase height is inconspicuous removal, and ammonia-nitrogen removal has evident improvement during 220-440mm. At the media height of 20mm, 40mm and 60mm in ZCBAF respectively, the removal efficiency of CODMn is 18.05%，31.6% and 38.62% respectively, NH4+-N removal efficiency is 29.78%,81.28% and 93.02% respectively , and UV254 removal efficiency is 7.81%，10.11% and 11.26% respectively under the air/water ratio of 1:1 and the hydraulic loading of 1.2m3/(m2.h). Removal rate of CODMn was decreased with the increase of hydraulic loading, and removal effect of NH4+-N and UV254 had not big influence.

Research of Carbon and Nitrogen Ratio and Sludge Stability in Aerobic Granular Sludge Bioreactor

2012 ◽  
Vol 518-523 ◽  
pp. 473-477
Author(s):  
Xia Zhao ◽  
Hui Xia Feng ◽  
Feng Jiang ◽  
Na Li Chen ◽  
Xiao Chun Wang
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Batch Reactor ◽  
Granular Sludge ◽  
Ammonia Nitrogen ◽  
Nitrifying Bacteria ◽  
Aerobic Granular Sludge ◽  
Nitrogen Ratio ◽  
The Stability

In sequencing batch reactor aerobic granular sludge was cultivated, and the influence of influent C/N ratio to aerobic granular sludge was studied. The results showed that the granulation and the settling ability of the sludge were poor in high C/N, however, low C/N was beneficial to the accumulation of microorganism in reactor and MLSS could reach to as high as 8740 mg/L. Lower C/N ratio would lead to increase of particle size and disintegrate of loose structure and overgrowth on filamentous microbe, these were disadvantage of the stability of the system. It was not obvious that influent C/N ratio affected on the organic removal. The COD removal maintained at 87% after the preliminary form particles were formed in reactor. When C/N ratio was 100:15~100:35, the phosphorus removal efficiency was good. If C/N ratio was too high or too low, the formation of sludge granulation would be affected in the process. The influence of C/N ratio to ammonia nitrogen removal efficiency was obvious. While C/N ratio was 100:10, granular sludge had good simultaneous nitrification and denitrification performance, and the average removal of ammonia nitrogen attained to 91%. But low C/N ratio was able to inhibit the activity of nitrifying bacteria and denitrifying bacteria. At that time, ammonia nitrogen removal rate declined sharply in the system.

scholarly journals Assessment of Microplastics in a Municipal Wastewater Treatment Plant with Tertiary Treatment: Removal Efficiencies and Loading per Day into the Environment

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1339
Author(s):  
Javier Bayo ◽  
Sonia Olmos ◽  
Joaquín López-Castellanos
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Source Control ◽  
Municipal Wastewater Treatment ◽  
Tertiary Treatment ◽  
Stable Performance ◽  
Wastewater Samples

This study investigates the removal of microplastics from wastewater in an urban wastewater treatment plant located in Southeast Spain, including an oxidation ditch, rapid sand filtration, and ultraviolet disinfection. A total of 146.73 L of wastewater samples from influent and effluent were processed, following a density separation methodology, visual classification under a stereomicroscope, and FTIR analysis for polymer identification. Microplastics proved to be 72.41% of total microparticles collected, with a global removal rate of 64.26% after the tertiary treatment and within the average retention for European WWTPs. Three different shapes were identified: i.e., microfiber (79.65%), film (11.26%), and fragment (9.09%), without the identification of microbeads despite the proximity to a plastic compounding factory. Fibers were less efficiently removed (56.16%) than particulate microplastics (90.03%), suggesting that tertiary treatments clearly discriminate between forms, and reporting a daily emission of 1.6 × 107 microplastics to the environment. Year variability in microplastic burden was cushioned at the effluent, reporting a stable performance of the sewage plant. Eight different polymer families were identified, LDPE film being the most abundant form, with 10 different colors and sizes mainly between 1–2 mm. Future efforts should be dedicated to source control, plastic waste management, improvement of legislation, and specific microplastic-targeted treatment units, especially for microfiber removal.

A study of NH3-N and P refixation by struvite formation in hybrid anaerobic reactor

2004 ◽  
Vol 49 (5-6) ◽  
pp. 207-214 ◽  
Author(s):  
J.J. Lee ◽  
C.U. Choi ◽  
M.J. Lee ◽  
I.H. Chung ◽  
D.S. Kim
Keyword(s):  
Removal Efficiency ◽  
Ammonia Nitrogen ◽  
Magnesium Ions ◽  
Nitrogen And Phosphorus ◽  
X Ray ◽  
Naked Eye ◽  
N Removal ◽  
Magnesium Salts ◽  
Main Components ◽  
P Removal

This research is concerned with the removal of ammonia nitrogen and phosphorus in foodwaste by crystallization. Reductions have been achieved by struvite formation after the addition of magnesium ions (Mg2+). Magnesium ions used in this study were from magnesium salts of MgCl2. The results of our analysis using scanning electron microscopy and energy dispersive X-ray analysis showed that the amount of struvite in precipitated sludge grew enough to be seen with the naked eye (600-700μm). EDX analysis also showed that the main components of the struvite were magnesium and phosphorus. NH3-N removal efficiency using MgCl2 was 67% while PO4-P removal efficiency was 73%. It was confirmed that nitrogen and phosphorus could be stabilized and removal simultaneously through anaerobic digestion by Mg, NH3 and PO4-P, which were necessary for struvite formation.

Performances of a granular sequencing batch reactor (GSBR)

2007 ◽  
Vol 55 (8-9) ◽  
pp. 125-133 ◽  
Author(s):  
M. Torregrossa ◽  
G. Di Bella ◽  
G. Viviani ◽  
A. Gnoffo
Keyword(s):  
Removal Efficiency ◽  
Bubble Column ◽  
Batch Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Aerobic Granulation ◽  
Reactor Configuration ◽  
N Removal ◽  
Hydrodynamic Shear ◽  
Removal Efficiencies

Aerobic granulation in sequencing batch reactors is widely reported in literature and in particular in SBAR (Sequencing batch airlift reactor) configuration, due to the high localised hydrodynamic shear forces that occur in this type of configuration. The aim of this work was to observe the phenomenon of the aerobic granulation and to confirm the excellent removal efficiencies that can be achieved with this technology. In order to do that, a laboratory-scale plant, inoculated with activated sludge collected from a conventional WWTP, was operated for 64 days: 42 days as a SBAR and 22 days as a SBBC (sequencing batch bubble column). The performances of the pilot plant showed excellent organics removal. COD and BOD removal efficiencies were respectively, 93 and 94%; on the contrary, N-removal efficiency was extremely low (5%–45%). The granules dimensions increased during the whole experimentation; change of reactor configuration contributed to further improve this aspect. The experimental work confirmed the essential role of hydraulic settling time in the formation of aerobic granules and in the sludge settleability and the need to find an optimum between granule size and oxygen supply to achieve good N-removal efficiency.

Removal Efficiency of Environmental Endocrine Disrupting Chemicals Pollutants-Phthalate Esters in Northern WWTP

2013 ◽  
Vol 807-809 ◽  
pp. 694-698
Author(s):  
Rong Xin Huang ◽  
Zhen Xing Wang ◽  
Gang Liu ◽  
Qi Jin Luo
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Phthalate Esters ◽  
Endocrine Disrupting Chemicals ◽  
Treatment Plant ◽  
Activated Sludge Process ◽  
Wastewater Reclamation ◽  
Conventional Activated Sludge

In order to guarantee the reliability and security of reclaiming water, research on the removal efficiency of the environmental endocrine chemicals (EDCs) --the Phthalate Esters (PAEs) in conventional secondary activated sludge and wastewater reclamation and reuse process was undergoing at Harbin wastewater treatment plant (WWTP). The wastewater samples were colleted from every unit effluent of WWTP. The results showed that contamination of EDCs were presented in municipal wastewater at Harbin and the concentrations of the four PAEs were 21.01μg/L for Di-n-butyl Phthalate (DBP); 9.63μg/L for Di-n-octyl Phthalate (DnOP); 4.56μg/L for Diethyl Phthalate (DEP); 1.96μg/L for Dimethyl Phthalate (DMP) respectively in the influent. The conventional activated sludge has good removal efficiencies performance on DMP, DEP and DBP. With the increasing of molecular weight and branch chains of PAEs contaminations, the removal rate of the four PAEs in the conventional activated sludge process decreased from 99.82%(DMP)，90.60%(DEP)，90.10%(DBP) to the only 45.13% removal rate for DnOP, which was mostly removed from primary treatment but no from secondary activated sludge process; Coagulation-air flotation plus filtration process was not a feasible way to remove PAEs from reclaiming treatment units.

Simultaneous heterotrophic nitrification and aerobic denitrification at high concentrations of NaCl and ammonia nitrogen by Halomonas bacteria

2017 ◽  
Vol 76 (2) ◽  
pp. 386-395 ◽  
Author(s):  
Te Wang ◽  
Jian Li ◽  
Ling Hua Zhang ◽  
Ying Yu ◽  
Yi Min Zhu
Keyword(s):  
Removal Rate ◽  
Sodium Succinate ◽  
Bacterial Genome ◽  
Ammonia Nitrogen ◽  
Compatible Solute ◽  
Heterotrophic Nitrification ◽  
Aerobic Denitrification ◽  
Sequencing Analysis ◽  
N Removal ◽  
High Concentrations

To improve the efficiency of simultaneous heterotrophic nitrification and aerobic denitrification (SND) at high concentrations of NaCl and ammonia nitrogen (NH4+—N), we investigated the SND characteristics of Halomonas bacteria with the ability to synthesize the compatible solute ectoine. Halomonas sp. strain B01, which was isolated, screened and identified in this study, could simultaneously remove nitrogen (N) by SND and synthesize ectoine under high NaCl conditions. Gene cloning and sequencing analysis indicated that this bacterial genome contains ammonia monooxygenase (amoA) and nitrate reductase (narH) genes. Optimal conditions for N removal in a solution containing 600 mg/L NH4+–N were as follows: sodium succinate supplied as organic carbon (C) source at a C/N ratio of 5, pH 8 and shaking culture at 90 rpm. The N removal rate was 96.0% under these conditions. The SND by Halomonas sp. strain B01 was performed in N removal medium containing 60 g/L NaCl and 4,000 mg/L NH4+–N; after 180 h the residual total inorganic N concentration was 21.7 mg/L and the N removal rate was 99.2%. Halomonas sp. strain B01, with the ability to synthesize the compatible solute ectoine, could simultaneously tolerate high concentrations of NaCl and NH4+–N and efficiently perform N removal by SND.

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