scholarly journals Electrochemical redox treatment of denitrification in coastal secondary effluent using Ti/IrO2 anode

2021 ◽  
Author(s):  
Yaozong Zhang ◽  
Bo Pang
Keyword(s):  
Removal Efficiency ◽  
Treatment Plant ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Secondary Effluent ◽  
Low Carbon ◽  
Cathodic Potential ◽  
Nitrate N ◽  
N Removal ◽  
Electrochemical Redox

Abstract In northern coastal industrial park, inlet of the wastewater treatment plant (WWTP) had the characteristics of low carbon source and high chloride ion concentration, which resulted in its poor biodegradability. In this case, the experiment explored an electrochemistral method to remove nitrogen. Cathodic potential, Ti/IrO2 was confirmed as the anode and − 1.6V was taken as the potential in order to remove nitrate-N. The findings include: when the initial chloride ion was 2000 and 3000 mg/L, the effect on the removal difference of nitrogen was slight. When the electrolysis time was 60 min, ammonia-N was removed completely, nitrite-N concentration kept 1mg/L approximately. The ammonia-N removal efficiency went up with the increasing cathodic potential, and was completely removed in different water samples, but nitrate-N removal showed an opposite result. The production amount of nitrite-N was the least at -1.6V. As the pH increased, ammonia-N and nitrate-N’s removal efficiency went up first and then down, the removal effect was the best at pH being 9, Nitrite-N was less influenced by pH. After optimizing the raw water sample, Nitrate-N and TN removal efficiency were significantly increased, but the nitrite-N almost kept constant.

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.

scholarly journals Impact on Gaza aquifer from recharge with partially treated wastewater

2011 ◽  
Vol 1 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Sami M. Hamdan ◽  
Abdelmajid Nassar ◽  
Uwe Troeger
Keyword(s):  
Water Resources ◽  
Gaza Strip ◽  
Treatment Plant ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Pilot Project ◽  
Ion Concentration ◽  
Treated Wastewater ◽  
Groundwater Levels ◽  
The Impact

The Gaza Strip suffers from high pressure imposed on its water resources. There is a deficit of about 50 mm3 every year, which has led to a declination of groundwater level and deterioration of groundwater quality. New water resources are sought to fulfil the water deficit; among them is the artificial recharge of treated wastewater to groundwater. The impact of recharging partially treated wastewater in Gaza was tested through a pilot project implemented east of the existing wastewater treatment plant. The daily application of about 10,000 m3 of effluent to infiltration basins had an effect on the aquifer, which was monitored through the surrounding operating water wells over five years from 2000 until 2005. Although the monitored wells are operated for irrigation by farmers, impacts were clearly noticed. Groundwater levels improved and an increase in some areas of 0.6 m within three years was observed. The nitrate ion concentration also decreased in the groundwater due to nitrification processes. However, chloride ion, which indicates salinity, increased because the effluent has high chloride concentration. Boron levels increased in some areas to 0.5 mg/l, which could affect sensitive crops grown in the area.

Simultaneous removal of nitrogen and phosphorus from wastewater by means of FeS-based autotrophic denitrification

2013 ◽  
Vol 67 (12) ◽  
pp. 2761-2767 ◽  
Author(s):  
Ruihua Li ◽  
Jianmin Niu ◽  
Xinmin Zhan ◽  
Bo Liu
Keyword(s):  
Municipal Wastewater ◽  
Removal Rate ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Autotrophic Denitrification ◽  
Municipal Wastewater Treatment ◽  
Nitrogen And Phosphorus ◽  
P Concentration ◽  
N Removal ◽  
Wide Ph Range

The efficacy of iron(II) sulfide (FeS)-based autotrophic denitrification in simultaneous nitrogen and phosphorus removal from wastewater was studied with batch experiments. It was efficient at a wide pH range of 5–9, and temperature range of 10–40 °C. The concentrations of NH4+-N, Mg2+ and HCO3− in the wastewater should be kept over 7.8, 0.24 and 30 mg L−1 for efficient nitrate (NO3−-N) reduction, respectively. The NO3−-N removal rate increased from 0 to 82 mg L−1 d−1 and then leveled off when the NO3−-N concentration increased from 0 to 415 mg L−1 and then to 700 mg L−1, respectively. The NO3−-N removal rate quickly increased, leveled off, and then sharply decreased when the PO43−-P concentration increased from 0 to 0.1 mg L−1, then to 114.0 mg L−1, and further to 683.8 mg L−1, respectively. The PO43−-P removal was over 98% when the PO43−-P concentration ranged 0–683.3 mg L−1. During treatment of the secondary effluent of a local municipal wastewater treatment plant containing NO3−-N of 14.9 mg L−1 and total phosphorus (TP) of 3.9 mg L−1, NO3−-N was reduced to 1.1 mg L−1 and TP was completely removed.

Comparison of the photocatalytic performance of TiO2/AC and TiO2/CNT nanocomposites for methyl orange photodegradation

2018 ◽  
Vol 78 (5) ◽  
pp. 1082-1093 ◽  
Author(s):  
Liping Wang ◽  
Jingru Guo ◽  
Jingjing Dang ◽  
Xiaojun Huang ◽  
Si Chen ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Removal Efficiency ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Chloride Ion ◽  
Degradation Efficiency ◽  
Ion Concentration ◽  
Nano Tio2 ◽  
Ultraviolet Wavelength ◽  
Nanotube Composites

Abstract To enhance the photocatalytic degradation efficiency of TiO2 on methyl orange (MO) removal, TiO2/AC (activated carbon) and TiO2/CNT (carbon nanotube) composites were synthesized. The prepared catalysts were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The photocatalytic performance of the obtained composites were investigated by the degradation of MO under UV irradiation (254 nm, 365 nm). The results revealed that the prepared nanocomposite showed higher MO degradation efficiency than pure nano-TiO2. Additionally, batch experiments of influencing factors, including H2O2 dosage, metal dopants, inorganic anions, chloride ion concentration and ultraviolet wavelength on the MO removal efficiency were also conducted. The results demonstrated that metal dopant and the presence of H2O2 significantly enhanced MO removal efficiency.

Performance of a large-scale wetland treatment system in treating tailwater from a sewage treatment plant

2018 ◽  
Vol 69 (5) ◽  
pp. 833 ◽  
Author(s):  
Siyuan Song ◽  
Benfa Liu ◽  
Wenjuan Zhang ◽  
Penghe Wang ◽  
Yajun Qiao ◽  
...  
Keyword(s):  
Water Quality ◽  
Removal Efficiency ◽  
Large Scale ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Surface Flow ◽  
N Removal ◽  
Effective Manner ◽  
Wetland Treatment

Water quality standards pertaining to effluent from sewage treatment plants (STPs) in China have become more stringent, requiring upgrading of STPs and entailing huge capital expenditure. Wetland treatment systems (WTSs) are a low-cost and highly efficient approach for deep purification of tailwater from STPs. The Hongze WTS (HZ-WTS), a large-scale surface-flow constructed wetland, with a total area of 55.58ha and a treatment capacity of 4×104m3day–1, was built for the disposal of tailwater from STPs. The aim of the present study was to evaluate the performance of HZ-WTP with regard to seasonal variations and to compare treatment costs with those of other STPs. The performance of the HZ-WTS was evaluated in 2013 using online monitoring. HZ-WTS exhibited significant removal efficiency of ammonia nitrogen (NH4+-N), chemical oxygen demand and total phosphorus (mean±s.d., percentage removal efficiency 56.33±70.44, 55.64±18.58 and 88.44±22.71% respectively), whereas there was significant seasonal variation in the efficiency of NH4+-N removal. In addition, the average treatment cost was ¥0.17m–3, significantly lower than the corresponding value for other STPs. Therefore, WTSs are recommended for use with STPs in order to improve waste water quality in a cost-effective manner.

APPLICATION OF MICROFILTRATION AND ULTRAFILTRATION FOR REUSING TREATED WASTEWATER; AS A SOLUTION TO EASE IRAN’S WATER SHORTAGE PROBLEMS

2015 ◽  
Vol 11 (6) ◽  
pp. 3662-3668
Author(s):  
Leila Babaei ◽  
A. Torabian ◽  
B. Aminzadeh
Keyword(s):  
Removal Efficiency ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Water Shortage ◽  
Fecal Coliforms ◽  
Treated Wastewater ◽  
Secondary Effluent ◽  
Allowable Level ◽  
Ozone Injection

Water shortage is a big problem in the Middle East. This paper investigates the possibility of reusing municipal wastewater by membrane filtration for non-potable consumption. The wastewater used for tests in this study was secondary effluent discharged from the secondary sedimentation pond of Ekbatan wastewater treatment plant in Tehran. These tests on reusing wastewater involved four main processes. Results showed that the best process was that ozone injection before MF and UF with COD removal efficiency of approximately 78 percent. In this case, removal efficiency of turbidity and TSS were 100 percent; additionally, traces of total and fecal Coliforms were completely removed. In the membrane processes, removal efficiency of TKN was about 40 percent. The removal efficiency of TP in all processes was about 7 percent, while it increased to 14 percent in the hybrid treatment. It can be concluded that all of further purification processes failed to achieve total phosphorus (TP) standards and thus in order to eliminate TP and reach allowable level, further researches are needed.<w:LsdException Locked="false" Priority="73" SemiHidden="false" UnhideWhenUsed="false" Name="Color

A Batch Activated Sludge Study of Pineapple Wastewater Using a Bioaugmentation Process

1991 ◽  
Vol 24 (5) ◽  
pp. 233-240 ◽  
Author(s):  
Nik Fuaad Nik Abllah ◽  
Aik Heng Lee
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Ammonia Nitrogen ◽  
Batch Reactors ◽  
Organic Loading ◽  
Suitable Alternative ◽  
Organic Removal ◽  
Sludge Production

A laboratory study was conducted to determine the feasibility of batch activated sludge reactor for treating pineapple wastewater and to examine the effects of bioaugmentation on treatment performance. The experimental set-up consists of eleven batch reactors. Activated sludge obtained from a wastewater treatment plant treating domestic wastewater was used as seed for the reactors. Synthetic pineapple wastewater was used as feed for the reactors. The eleven reactors were arranged to evaluate the total organic removal, nitrification, and sludge production by bioaugmentation process. Three major factors considered were influent organic loading, ammonia-nitrogen, and dosage of bacterial-culture-product addition. Removal of TOG (total organic carbon), sludge production in terms of SS(suspended solids), and ammonia-nitrogen removal variation are used as evaluation parameters. The TOC removal efficiency after the end of a 48 hour reactor run, for influent TOC of 350.14 to 363.30 mg/l, and 145.92 to 169.66 mg/l, was 94.41 to 95.89%, and 93.72 to 94.73% respectively. Higher organic removal was observed in the bioaugmented reactors with higher organic loading. The better organic removal efficiency in the bioaugmented reactors was probably due to activities of bacteria added. The test results also indicated that sludge yield was enhanced by the bacteria additive and high bacteria dosage produced less sludge. Bioaugmentation was observed to be a suitable alternative for enhancing the biological treatment of pineapple wastewater.

WASTEWATER DISINFECTION BY UV AT TRANI MUNICIPAL PLANT

1994 ◽  
Vol 30 (4) ◽  
pp. 125-132 ◽  
Author(s):  
D. Carnimeo ◽  
E. Contini ◽  
R. Di Marino ◽  
F. Donadio ◽  
L. Liberti ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Continuous Operation ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
South Italy ◽  
Wastewater Disinfection ◽  
Pilot Investigation ◽  
Effluent Characteristics

The pilot investigation on the use of UV as an alternative disinfectant to NaOCI was started in 1992 at Trani (South Italy) municipal wastewater treatment plant (335 m3/h). The results collected after six months continuous operation enabled us to compare UV and NaOCl disinfection effectiveness on the basis of secondary effluent characteristics, quantify photoreactivation effects, evidence possible DBP formation and assess costs.

Modelling the performance of anaerobic wastewater stabilization ponds

1995 ◽  
Vol 31 (12) ◽  
pp. 171-183 ◽  
Author(s):  
M. M. Saqqar ◽  
M. B. Pescod
Keyword(s):  
Wastewater Treatment ◽  
Water Temperature ◽  
Removal Efficiency ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Pond Water ◽  
Removal Efficiencies ◽  
Wastewater Stabilization Ponds ◽  
Raw Wastewater

The performance of the primary anaerobic pond at the Alsamra Wastewater Treatment Plant in Jordan was monitored over 48 months. Overall averages for the removal efficiencies of BOD5, COD and suspended solids were 53%, 53% and 74%, respectively. An improvement in removal efficiency with increase in pond water temperature was demonstrated. A model, which takes into account the variability of raw wastewater at different locations, has been developed to describe the performance of a primary anaerobic pond in terms of a settleability ratio for the raw wastewater. The model has been verified by illustrating the high correlation between actual and predicted pond performance.

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