Tertiary nitrification in pure oxygen moving bed biofilm reactors

2000 ◽  
Vol 41 (4-5) ◽  
pp. 361-368 ◽  
Author(s):  
L. Bonomo ◽  
G. Pastorelli ◽  
E. Quinto ◽  
G. Rinaldi
Keyword(s):  
Municipal Wastewater ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Pure Oxygen ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Typical Application ◽  
Moving Bed ◽  
Biofilm Reactors ◽  
Nitrogen Ratio

Two bench-scale reactors, fed with the secondary effluent of a municipal wastewater treatment plant (WWTP), were used in order to study tertiary nitrification in pure oxygen moving bed biofilm reactors (PO-MBBRs) with patented KMT® media as biofilm carriers. The process allowed to measure very high nitrification rates, both in ammonia limiting conditions (up to 7 gN m−2 d−1; oxygen-to-ammonia nitrogen ratio higher than 3–4 mgO2 (mgN)−1) and in oxygen limiting conditions (up to 8 gN m−2 d−1; oxygen-to-ammonia nitrogen ratio lower than 1–2 mgO2 (mgN)−1). Since the process proved flexible and reliable, it is suitable for full-scale application to municipal WWTPs. Typical application could regard, but is not limited to, tertiary nitrification of secondary effluent from existing high-purity oxygen activated sludge systems designed to achieve only organic carbon removal.

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.

Enhanced Performance of Ultrafiltration Membrane with Powdered Zeolite Addition for Secondary Effluent Treatment

2013 ◽  
Vol 838-841 ◽  
pp. 2712-2716
Author(s):  
Yong Tu ◽  
Yong Gang Bai ◽  
Yong Chen ◽  
Wei Jing Liu ◽  
Jun Xu ◽  
...  
Keyword(s):  
Membrane Fouling ◽  
Fluorescence Spectra ◽  
Municipal Wastewater ◽  
Three Dimensional ◽  
Treatment Plant ◽  
Ultrafiltration Membrane ◽  
Effluent Treatment ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Sem Images

The research on ultrafiltration membrane assisted by powdered zeolite for the treatment of secondary effluent from a municipal wastewater treatment plant was studied. The results show that membrane fouling rate is reduced by pre-coating the ultrafiltration membrane with powdered zeolite, and the treatment performance of secondary effluent is enhanced. UV-vis, three-dimensional excitation emission matrix (3D-EEM) fluorescence spectra and scanning electron microscopy (SEM) images for ultrafiltration were also discussed.

scholarly journals Advanced nitrogen removal from municipal wastewater treatment plant secondary effluent using a deep bed denitrification filter

2018 ◽  
Vol 77 (11) ◽  
pp. 2723-2732 ◽  
Author(s):  
Xiaowei Zheng ◽  
Shenyao Zhang ◽  
Jibiao Zhang ◽  
Deying Huang ◽  
Zheng Zheng
Keyword(s):  
Wastewater Treatment ◽  
Quartz Sand ◽  
High Throughput Sequencing ◽  
Municipal Wastewater ◽  
Nitrate Nitrogen ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Microbial Distribution

Abstract With the improvement of wastewater discharge standards, wastewater treatment plants (WWTPs) are continually undergoing technological improvements to meet the evolving standards. In this study, a quartz sand deep bed denitrification filter (DBDF) was used to purify WWTP secondary effluent, utilizing high nitrate nitrogen concentrations and a low C/N ratio. Results show that more than 90% of nitrate nitrogen (NO3-N) and 75% of chemical oxygen demand (COD) could be removed by the 20th day of filtration. When the filter layer depth was set to 1,600 mm and the additional carbon source CH3OH was maintained at 30 mg L−1 COD (20 mg L−1 methanol), the total nitrogen (TN) and COD concentrations of DBDF effluent were stabilized below 5 and 30 mg L−1, respectively. Analysis of fluorescence revealed that DBDF had a stronger effect on the removal of dissolved organic matter (DOM), especially of aromatic protein-like substances. High throughput sequencing and qPCR results indicate a distinctly stratified microbial distribution for the main functional species in DBDF, with quartz sand providing a good environment for microbes. The phyla Proteobacteria, Bacteroidetes, and Chloroflexi were found to be the dominant species in DBDF.

scholarly journals Tertiary Physico-chemical Treatment of Secondary Effluent from the Chania Municipal Wastewater Treatment Plant

2013 ◽  
Vol 9 (2) ◽  
pp. 166-173
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Chemical Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plant ◽  
Physico Chemical ◽  
High Doses

The present study investigated tertiary physico-chemical treatment of the secondary effluent from the Chania municipal Wastewater Treatment Plant (WTP). Laboratory experiments were carried out with the aim of studying coagulation efficiency regarding reduction of turbidity, soluble COD and phosphorus both in a conventional Coagulation-Settling treatment scheme, as well as by means of Contact Filtration. The results showed that high doses of coagulants (0,5 mmol Me+3 l-1 or higher) are required to achieve significant removals of turbidity after settling. At these high doses, soluble COD can be removed by about 50%, while soluble Phosphorus by 80-95%. Ferric Chloride demonstrated slightly better removal ability as compared to Alum. The Chania WTP effluent was also treated by Contact Filtration, using a very low dose of coagulants, 0,1 mmol Me+3 l-1. Turbidity was removed by around 50%, while at this low coagulant dose removals of COD and Phosphorus were insignificant. Filtration was effective in the first 35cm of the filter bed. No significant differences were observed between the coagulants Alum and FeCl3 in the elimination of turbidity. Nevertheless, with the use of Alum a smaller filter headloss was observed, during the first two hours of continuous filtration, in comparison with the use of FeCl3 (nearly double). No difference was observed between the headloss developed at a filter depth of 5cm as compared to that developed at a depth of 70cm. This indicates that the headloss increase was due to the accumulation of suspended and colloidal solids within the first layers of the sand filter.

scholarly journals Effect of O3 Dose on the O3/UV Treatment Process for the Removal of Pharmaceuticals and Personal Care Products in Secondary Effluent

2019 ◽  
Vol 3 (2) ◽  
pp. 53 ◽  
Author(s):  
N. Evelin Paucar ◽  
IIho Kim ◽  
Hiroaki Tanaka ◽  
Chikashi Sato
Keyword(s):  
Municipal Wastewater ◽  
Treatment Process ◽  
Limit Of Detection ◽  
Personal Care Products ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Personal Care ◽  
Uv Treatment

A municipal wastewater treatment plant (WWTP) is a melting pot of numerous pharmaceuticals and personal care products (PPCPs) together with many other substances. The removal of PPCPs using advanced oxidation processes within a WWTP is one way to reduce the amount of PPCPs that potentially enter an aquatic environment. The aim of this study was to examine the effectiveness of the ozone (O3)/UV treatment process, especially, the effects of O3 dose and reaction time, on the removal of PPCPs in the secondary effluent of a WWTP. Experiments were conducted using a pilot-scale treatment process that consisted of two flow-through reactors connected in series. Each reactor was equipped with three 65 W lamps (UV65W). The experimental variables were ozone dosage (1, 2, 3, 4, and 6 mg L−1) and hydraulic retention time (HRT; 5 and 10 min). On the basis of the PPCP concentrations after O3/UV65W treatment and their limit of detection (LOD), 38 PPCPs detected in the secondary effluent were classified into 5 groups ranging from the category of “sensitive” to O3/UV65W or “unstable” in the O3/UV65W process to the category of “insensitive” to O3/UV65W or “very stable” in the O3/UV65W process.

scholarly journals Application of anoxic phase in SBR reactor to increase the efficiency of ammonia removal in Vietnamese municipal WWTPs

2019 ◽  
Vol 97 ◽  
pp. 01017 ◽  
Author(s):  
Tran Ha Quan ◽  
Elena Gogina
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Rate Increase ◽  
Treatment Plant ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Biological Wastewater Treatment ◽  
Municipal Wastewater Treatment ◽  
Near Future ◽  
Nitrogen Loadings

Process removal nutrients, especially nitrogen – ammonia in municipal wastewater treatment is a challenger of design and operate wastewater treatment plant. Nowadays in Vietnam, technology SBR has been wide applied in biological wastewater treatment but the concentration of nitrogen – ammonia in treated water cannot achieve the discharge standard. For the purpose to reach the Vietnamese Standard A, the modification of SBR has been added the anoxic phase into operated cycle to create the denitrification’s environment and enhance performance of ammonia – nitrogen removal in municipal wastewater treatment at present and in the near future. The results of experiment shows that, the efficiency of N – NH4 removal in reactors sustainable in range 75 – 80% with the nitrogen loadings rate from 0.07 – 0.25 kg N – NH4/kg sludge/d. However, in 3 hours of anoxic phase, the value of specific denitrification rate is 0.10 – 0.15 kg N – NO3/kg sludge/d with the organic loadings rate in range 0.3 – 1.0 kg BOD/kg sludge/d and can reach the maximum is 0.2 kg N – NO3/kg sludge/d when the organic loadings rate increase to 2.0 kg BOD/kg sludge/d.

Modelling Nitrification of a Lagoon Effluent in Moving-Bed Biofilm Reactors

2007 ◽  
Vol 42 (4) ◽  
pp. 284-294 ◽  
Author(s):  
Dwight Houweling ◽  
Frédéric Monette ◽  
Louise Millette ◽  
Yves Comeau
Keyword(s):  
Pilot Study ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Biofilm Reactor ◽  
Organic Load ◽  
Bulk Liquid ◽  
Moving Bed ◽  
Biofilm Reactors ◽  
Total Ammonia

Abstract A pilot study was performed at the Sainte-Julie wastewater treatment plant to evaluate the potential of using the Moving-Bed biofilm reactor (MBBR) process for removing BOD5 (5-day biochemical oxygen demand) and ammonia nitrogen in a two-stage process at the exit of the first lagoon. Nitrification was observed in the first reactor at rates similar to those reported in the literature for a similar biomass carrier when bulk liquid dissolved oxygen (DO) concentrations were 6 g of O2 per m3. Nitrification rates were significantly reduced when DO was reduced to 3 g of O2 per m3. DO concentrations were maintained at 6 g of O2 per m3 in the second reactor, and nitrification rates comparable to those reported in the literature were observed for a temperature range of 3 to 16°C. An empirical DO-limited model was validated for the first reactor while in the second reactor nitrification was found to be either DO limited or total-ammonia-nitrogen limited, depending on nitrification rates in the upstream reactor. The DO-limited model predicts that the MBBR process is more sensitive to organic load than it is to temperature. A commercially available numerical model was calibrated to the results of the pilot study. Model results indicate that detachment and attachment rates play an important role in determining nitrification rates in the biofilm. Similar nitrification rates in an MBBR system installed upstream and downstream from an aerated lagoon in winter conditions were predicted using the empirical DO-limited model.

Identification and evaluation of a dominant alga from municipal wastewater in removal of nutrients

2016 ◽  
Vol 74 (11) ◽  
pp. 2727-2735 ◽  
Author(s):  
Yixuan Yang ◽  
Fei Tang ◽  
Xiaoling Su ◽  
Hua Yin ◽  
Fei Ge
Keyword(s):  
Nitrogen Source ◽  
Nutrient Removal ◽  
Municipal Wastewater ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Removal Rate ◽  
Treatment Plant ◽  
Secondary Effluent ◽  
Municipal Wastewater Treatment ◽  
Low Concentrations ◽  
Gradient Gel Electrophoresis

To access better removal of nutrients with algae-based techniques, a dominant alga from real municipal wastewater was identified and its capacity in removing low concentrations of nitrogen (NH+4 or NO−3) and phosphorus (PO3−4) was evaluated. Results showed that Oedogonium brevicingulatum, a filamentous green alga, was confirmed as the dominant alga in the secondary effluent of a municipal wastewater treatment plant by polymerase chain reaction-denaturing gradient gel electrophoresis. Low concentrations of NH+4 or NO−3 (≤5 mg N L−1) and PO3−4 (≤0.5 mg P L−1) were 100% removed by the algae in a 7-d test. The maximum nutrient removal rate (Vmax) and the half-saturation constant (Km) for NH+4 (10.03 ± 0.95 mg g−1d−1 and 0.19 ± 0.03 mg L−1) and NO−3 (8.43 ± 0.21 mg g−1 d−1 and 0.27 ± 0.11 mg L−1) indicated the uptake capability for NH+4 is higher than that for NO−3. Meanwhile, it showed higher affinity for PO3−4 (Vmax: 1.42 ± 0.02 mg g−1 d−1; Km: 0.02 ± 0.00 mg L−1) with NH+4 as nitrogen source than that (Vmax: 1.24 ± 0.15 mg g−1 d−1; Km: 0.06 ± 0.03 mg L−1) with NO−3 as nitrogen source. Moreover, nutrient removal efficiencies were observed steady when nitrogen/phosphorus ratio ranged from 5:1 to 20:1. These results suggest that the dominant algae from municipal wastewater have potentials to be applied in nutrient removal.

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