Tannery wastewater treatment: comparison between SBR and MSBR

2003 ◽  
Vol 3 (5-6) ◽  
pp. 275-282 ◽  
Author(s):  
J.M. Martinez ◽  
A. Goltara ◽  
R. Mendez
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Stable Operation ◽  
Filamentous Bacteria ◽  
Removal Rates ◽  
Loading Rates ◽  
Treatment Comparison ◽  
Removal Efficiencies

The beamhouse sections of tanneries produce around 45% of the total wastewater of factories. A beamhouse wastewater, collected after the oxidation of sulphide compounds and diluted to average COD and ammonium concentrations around 550 and 90 mg/L respectively, was treated separately in two reactors: a sequencing batch reactor (SBR) and a membrane sequencing batch reactor (MSBR). Both systems were operated for 150 days with similar conditions without sludge purge, operating at low feed to microorganisms (F/M) ratios and applying organic and ammonium loading rates up to 0.75 gCOD/L·d and 0.12 gNH4+/L·d respectively. The SBR achieved low ammonium and nitrogen removal rates and COD removal values close to 90%, which decreased dramatically during the last 30 days of operation. An important washout of microorganisms in the SBR was noticed due to the proliferation of filamentous bacteria. However, removal efficiencies close to 100% in ammonium and 90% in COD were achieved in the MSBR, and very stable operation was maintained.

scholarly journals Simultaneous ammonium and nitrate removal by a modified intermittently aerated sequencing batch reactor (SBR) with multiple filling events

2016 ◽  
Vol 18 (3) ◽  
pp. 72-80 ◽  
Author(s):  
Mehdi Hajsardar ◽  
Seyed Mehdi Borghei ◽  
Amir Hessam Hassani ◽  
Afshin Takdastan
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
Nitrogen Loading ◽  
Loading Rates ◽  
Kinetic Coefficients ◽  
Solids Retention ◽  
Ph Curve

Abstract Optimized methods for simultaneous removal of nitrate, nitrite and ammonium are important features of nutrient removal. Nitrogen removal efficiency in an intermittently aerated sequencing batch reactor (IA-SBR) with multiple filling events was studied. No external carbon source was added and three filling events were considered. Oxidationreduction potential (ORP) and pH curve at solids retention time (SRT) of 20 d were analyzed. Effects of three organic loading rates (OLR), 0.67, 1.0 and 1.5 kgCOD/m3d, and three nitrogen loading rates (NLR), 0.054, 0.1 and 0.15 kgN/m3d, on nitrogen removal were studied. Nitrate Apex in pH curve and Nitrate Knee in ORP profile indicated that the end of denitrification would be achieved sooner. The kinetic coefficients of endogenous decay (kd) and yield (Y) were identified to evaluate heterotrophic specific denitrification rate (SDNRb). In period 2 at NLR of 0.054 kgN/m3d and considering 2 anoxic and 3 aerobic phases, nitrogen removal efficiency was 91.43%.

Carbon and nitrogen removal from tannery wastewater with a membrane bioreactor

2003 ◽  
Vol 48 (1) ◽  
pp. 207-214 ◽  
Author(s):  
A. Goltara ◽  
J. Martinez ◽  
R. Mendez
Keyword(s):  
Organic Matter ◽  
Nitrogen Removal ◽  
Membrane Bioreactor ◽  
Sequencing Batch Reactor ◽  
Biomass Yield ◽  
Batch Reactor ◽  
Biomass Concentration ◽  
Carbon And Nitrogen ◽  
Yield Values ◽  
Removal Efficiencies

A 3.5 L Membrane Sequencing Batch Reactor (MSBR) was used for the treatment of a wastewater coming from the beamhouse section of a tannery. The wastewater, produced after the oxidation of sulphide compounds, contained average COD and ammonium concentrations of 550 and 90 mg/L respectively. The system was operated for a period of 150 days, with no sludge removal during the whole period of operation. The biomass concentration inside the reactor varied considerably, with maximum values close to 10 g/L at the end of operation. Low biomass yield values were achieved probably due to the low feed/microorganisms (F/M) ratio. An important accumulation of organic matter in the reactor was noticed, although the COD effluent was not affected due to the permeation through the membrane. The nature of this organic matter is finally discussed. Removal efficiencies close to 100% in ammonium and 90% in COD were achieved and the TN removal efficiency ranged from 60 to 90%.

scholarly journals Ecophysiology and dynamics of nitrogen removal bacteria in a sequencing batch reactor during wastewater treatment start-up

2019 ◽  
Vol 16 (8) ◽  
pp. 4215-4222 ◽  
Author(s):  
A. Ziembińska-Buczyńska ◽  
A. Banach-Wiśniewska ◽  
M. Tomaszewski ◽  
I. Poprawa ◽  
S. Student ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Treatment Start ◽  
Start Up

scholarly journals Optimization of sequencing batch reactor for wastewater treatment using chemically enhanced primary treatment as a pre-treatment

Water SA ◽  
2018 ◽  
Vol 44 (3 July) ◽  
Author(s):  
Haroon R Mian ◽  
Sajjad Haydar ◽  
Ghulam Hussain ◽  
Gul -e-Hina
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Phase 1 ◽  
Oxygen Demand ◽  
Scale Model ◽  
Phase 2 ◽  
Removal Efficiencies ◽  
Raw Wastewater

The sequencing batch reactor (SBR) is a wastewater treatment option feasible for low flows. The objective of this research was to optimize SBR by varying its operational parameters, viz. (i) settling time and (ii) reaction time. The study was conducted in two phases. In Phase 1, raw wastewater was fed into the SBR after conventional settling, while in Phase 2 raw wastewater was fed into the SBR after coagulation-flocculation-sedimentation. A bench-scale model was set up and domestic wastewater was used for this study. Performance of the treatment system was evaluated through 5-day biochemical oxygen demand (BOD), chemical oxygen demand (COD) and total suspended solids (TSS). The results demonstrated that reaction time was reduced to 4 h in Phase 2 compared to 10 h in Phase 1. The BOD, COD and TSS removal efficiencies observed in Phase 1 were 80%, 80% and 73%, respectively, and for Phase 2 the removal efficiencies were 74%, 75% and 80% respectively. National Environmental Quality Standards (NEQS) were met in both cases and the treatment cost per cubic metre of wastewater for Phase 2 was 2.5 times lower compared to Phase 1.

Excess nitrogen accumulation in activated sludge in sequencing batch reactor with a single-stage oxic process

2009 ◽  
Vol 59 (3) ◽  
pp. 573-582 ◽  
Author(s):  
Xiao-ming Li ◽  
Dong-bo Wang ◽  
Qi Yang ◽  
Wei Zheng ◽  
Jian-bin Cao ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Ph Value ◽  
Batch Reactor ◽  
Nitrogen Loss ◽  
Single Stage ◽  
Synthetic Wastewater ◽  
Nitrogen Accumulation ◽  
Excess Nitrogen

It was occasionally found that a significant nitrogen loss in solution under neutral pH value in a sequencing batch reactor with a single-stage oxic process using synthetic wastewater, and then further studies were to verify the phenomenon of nitrogen loss and to investigate the pathway of nitrogen removal. The result showed that good performance of nitrogen removal was obtained in system. 0–7.28 mg L−1 ammonia, 0.08–0.38 mg L−1 nitrite and 0.94–2.12 mg L−1 nitrate were determined in effluent, respectively, when 29.85–35.65 mg L−1 ammonia was feeding as the sole nitrogen source in influent. Furthermore, a substantial nitrogen loss in solution (95% of nitrogen influent) coupled with a little gaseous nitrogen increase in off-gas (7% of nitrogen influent) was determined during a typical aerobic phase. In addition, about 322 mg nitrogen accumulation (84% of nitrogen influent) was detected in activated sludge. Based on nitrogen mass balance calculation, the unaccounted nitrogen fraction and the ratio of nitrogen accumulation in sludge/nitrogen loss in solution were 14.6 mg (3.7% of nitrogen influent) and 0.89, respectively. The facts indicated that the essential pathway of nitrogen loss in solution in this study was excess nitrogen accumulation in activated sludge.

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