Optimization of reverse osmosis operational conditions to maximize ammonia removal from the effluent of an anaerobic membrane bioreactor

2021 ◽  
Vol 7 (4) ◽  
pp. 739-747
Author(s):  
Chungheon Shin ◽  
Aleksandra Szczuka ◽  
Renjing Jiang ◽  
William A. Mitch ◽  
Craig S. Criddle
Keyword(s):  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Ammonia Removal ◽  
Clean Water ◽  
Operational Conditions ◽  
Anaerobic Membrane Bioreactor ◽  
Total Ammonia ◽  
Operational Factor ◽  
Membrane Surface Charge

RO enables the recovery of clean water and ammonium in anaerobic membrane bioreactor effluent. pH governs the ammonia speciation and membrane surface charge and is the key operational factor that affects the total ammonia rejection efficiency of RO.

Exerting ultrasound to control the membrane fouling in filtration of anaerobic activated sludge—mechanism and membrane damage

2008 ◽  
Vol 57 (5) ◽  
pp. 773-779 ◽  
Author(s):  
Xianghua Wen ◽  
Pengzhe Sui ◽  
Xia Huang
Keyword(s):  
Activated Sludge ◽  
Hydroxyl Radicals ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Chemical Interaction ◽  
Membrane Surface ◽  
Membrane Damage ◽  
Operational Conditions ◽  
Fouling Control ◽  
Cake Layer

In this study, ultrasound was applied to control membrane fouling development online in an anaerobic membrane bioreactor (AMBR). Experimental results showed that membrane fouling could be controlled effectively by ultrasound although membrane damage may occur under some operational conditions. Based upon the observation on the damaged membrane surface via SEM, two mechanisms causing membrane damage by exerting ultrasound are inferred as micro particle collide on the membrane surface and chemical interaction between membrane materials and hydroxyl radicals produced by acoustic cavitations. Not only membrane damage but also membrane fouling control and membrane fouling cleaning were resulted from these mechanisms. Properly selecting ultrasonic intensity and working time, and keeping a certain thickness of cake layer on membrane surface could be effective ways to protect membrane against damage.

scholarly journals Autotrophic ammonia removal from landfill leachate using anaerobic membrane bioreactor

2017 ◽  
Author(s):  
S. Suneethi ◽  
Kurian Joseph
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Ammonium Oxidation ◽  
Anaerobic Membrane Bioreactor ◽  
N Removal ◽  
Anammox Process

Anaerobic Membrane Bioreactor (AnMBR) is an innovative high cell density system having complete biomass retention, high reactor loading and low sludge production and suitable for developing slow growing autotrophic bacterial cultures such as ANAMMOX. The Anaerobic Ammonium Oxidation (ANAMMOX) process is an advanced biological nitrogen removal removes ammonia using nitrite as the electron acceptor without oxygen. The NH4+-N in the landfill leachate that is formed due to the release of nitrogen from municipal solid waste (MSW), when discharged untreated, into the surface water can result in eutrophication, aquatic toxicity and emissions of nitrous oxide (N2O) to atmosphere. Besides, NH4+-N accumulation in landfills poses long term pollution issue with significant interference during post closure thereby requiring its removal prior to ultimate disposal into inland surface waters. The main objective of this study was to investigate the feasibility and treatment efficiency of treating landfill leachate (to check) for removing NH4+-N by adopting ANAMMOX process in AnMBR. The AnMBR was optimized for Nitrogen Loading Rate (NLR) varying from 0.025 to 5 kg NH4+-N/ m3/ d with hydraulic retention time (HRT) ranging from 1 to 3 d. NH4+-N removal efficacy of 85.13 ± 9.67% with the mean nitrogen removal rate (NRR) of 5.54 ± 0.63 kg NH4+-N/ m3/ d was achieved with nitrogen loading rate (NLR) of 6.51 ± 0.20 kg NH4+- N/ m3/ d at 1.5 d HRT. The nitrogen transformation intermediates in the form of hydrazine (N2H4) and hydroxylamine (NH2OH) were 0.008 ± 0.005 mg/L and 0.006 ± 0.001 mg/L, respectively, indicating co-existence of aerobic ammonia oxidizers (AOB) and ANAMMOX. The free ammonia (NH3) and free nitrous acid (HNO2) concentrations were 26.61 ± 16.54 mg/L and (1.66 ± 0.95) x 10-5 mg/L, preventing NO2--N oxidation to NO3--N enabling sustained NH4+- N removal.

Fouling mitigation in an anaerobic membrane bioreactor via membrane surface modification with tannic acid and copper

2021 ◽  
pp. 118205
Author(s):  
Punika Maneewan ◽  
Warayuth Sajomsang ◽  
Sudkanueng Singto ◽  
Jenyuk Lohwacharin ◽  
Benjaporn Boonchayaanant Suwannasilp
Keyword(s):  
Surface Modification ◽  
Tannic Acid ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Anaerobic Membrane Bioreactor ◽  
Fouling Mitigation

Anaerobic membrane bioreactor for treatment of synthetic municipal wastewater at ambient temperature

2007 ◽  
Vol 55 (7) ◽  
pp. 79-86 ◽  
Author(s):  
J.H. Ho ◽  
S.K. Khanal ◽  
S. Sung
Keyword(s):  
Composite Membrane ◽  
Membrane Bioreactor ◽  
Membrane Surface ◽  
Membrane System ◽  
Woven Fabric ◽  
Anaerobic Membrane Bioreactor ◽  
Fabric Filter ◽  
Ptfe Composite ◽  
Cake Layer ◽  
Sludge Cake

Non-woven fabric filter and poly-tetrafluoroethylene (PTFE) composite membrane were investigated to determine their applicability to treat low strength wastewater in an anaerobic membrane bioreactor (AMBR). Sludge cake resistance of the membrane was quantified using pure water flux of anaerobic sludge cake accumulated on the glass fiber filter of similar pore size. It is hypothesized that the formation of thin cake layer on the porous medium, e.g. non-woven and PTFE acts as a dynamic membrane. Thus, the capture of thin sludge cake inside the non-woven fabric matrix and accumulation on the PTFE membrane surface forms a membrane system equivalent to a commercial membrane system. The permeate quality was found to improve as the cake became more dense with filtration time. The PTFE composite membrane coated with thin PTFE film on the non-woven fabric filter enhanced the filtration performance by improving flux and minimizing the propensity of bio-fouling. The membrane flux was restored by back-flushing with permeate. The AMBR coupled with PTFE laminated membrane was operated continuously during the experiment at a cross flow velocity (CFV) of 0.1–0.2 m/sec and a transmembrane pressure (TMP) of 0.5–3 psi. Although about a month of acclimation was required to reach steady state, the effluent chemical oxygen demand (COD), volatile fatty acids (VFAs) as acetic acid, and suspended solids (SS) concentrations were below 30, 20 and 10 mg/L, respectively, during 90 days of operation with intermittent back washing. The lower operation TMP and CFV were subjected to less shear stress on the microbial community during continuous AMBR operation. In addition, thin sludge film accumulated on the membrane surface also acted as a biofilm bioreactor to remove additional COD in this study

Permeability decline in nanofiltration/reverse osmosis membranes fed with municipal wastewater treated by a membrane bioreactor

2013 ◽  
Vol 67 (9) ◽  
pp. 1994-1999 ◽  
Author(s):  
Katsuki Kimura ◽  
Naoko Ogawa ◽  
Yoshimasa Watanabe
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Membrane Surface ◽  
Chemical Cleaning ◽  
Filtration Resistance ◽  
Cake Layer ◽  
Total Filtration ◽  
Ro Membrane

Decline in the permeability in nanofiltration (NF)/reverse osmosis (RO) membranes that filtered effluents from a membrane bioreactor (MBR) treating municipal wastewater was investigated in this study. Four different 2-inch spiral-wound NF/RO membrane elements were continuously operated for 40 days. The results showed that the amount of deposits on the membrane surface did not affect the degree of permeability decline. Laboratory-scale filtration tests with coupons obtained from the fouled membranes also revealed that the contribution of the gel/cake layer to total filtration resistance was minor. Rather, constituents that were strongly bound to the membranes were mainly responsible for permeability decline. Chemical cleaning of the fouled membranes carried out after removal of the cake showed that silica played an important role in the decline in permeability. A considerable amount of organic matter which was mainly composed of carbohydrates and proteins was also desorbed from the fouled membranes.

Wastewater treatment with anaerobic membrane bioreactor and reverse osmosis

2007 ◽  
Vol 56 (5) ◽  
pp. 211-217 ◽  
Author(s):  
J. Grundestam ◽  
D. Hellström
Keyword(s):  
Organic Matter ◽  
Reverse Osmosis ◽  
Membrane Bioreactor ◽  
Domestic Wastewater ◽  
Gas Production ◽  
Nitrogen And Phosphorus ◽  
Anaerobic Membrane Bioreactor ◽  
Electricity Use ◽  
City District ◽  
New City

Domestic wastewater from a new city district in Stockholm has been treated by an anaerobic membrane bioreactor (AMBR) followed by reverse osmosis (RO). The main objectives were to study the gas production, the reduction of organic matter and nutrient recovery. The AMBR was operated at 22 °C (equal to the average temperature in the influent) and a hydraulic retention time of 0.6 d. The results show that the reduction of organic matter, nitrogen and phosphorus over the AMBR was approximately 92, 9 and 9%, respectively. A stable gas production was registered throughout the evaluation period. The overall removal efficiency, i.e. including the RO, was >99% for TOC, >91% for Kj-N and about 99% for P. Adding a reverse osmosis (RO) unit to the AMBR makes it possible to produce a concentrated, nutrient rich product well suited for agricultural use. The quality of the concentrate is, in terms of nutrient concentration and heavy metal content, similar to source separated human urine, i.e. nitrogen content about 3 g N/L and <2 mg Cd/kg P. However, addition of acid is required to prevent precipitation/fouling of the RO. The total electricity use for operation for the system, including the RO-unit, is estimated to be 3–6 kWh/m3.

scholarly journals Modern trends in the mathematical simulation of pressure-driven membrane processes

2020 ◽  
Vol 7 (1) ◽  
pp. F1-F21
Author(s):  
S. V. Huliienko ◽  
Y. M. Korniienko ◽  
K. O. Gatilov
Keyword(s):  
Mathematical Simulation ◽  
Reverse Osmosis ◽  
Concentration Polarization ◽  
Membrane Surface ◽  
Irreversible Thermodynamics ◽  
Membrane Processes ◽  
Pore Flow ◽  
Neural Networks Optimization ◽  
Membrane Surface Charge ◽  
Pressure Driven

The presented article is an attempt to evaluate the progress in the development of the mathematical simulation of the pressure-driven membrane processes. It was considered more than 170 articles devoted to the simulation of reverse osmosis, nanofiltration, ultrafiltration, and microfiltration and the others published between 2000 and 2010 years. Besides the conventional approaches, which include the irreversible thermodynamics, diffusion and pore flow (and models which consider the membrane surface charge for nanofiltration process), the application of the methods the computational fluid dynamics, artificial neural networks, optimization, and economic analysis have been considered. The main trends in this field have been pointed out, and the areas of using approaches under consideration have been determined. The technological problems which have been solved using the mentioned approaches have also been considered. Although the question of the concentration polarization has not been considered separately, it was defined that, in many cases, the sufficiently accurate model cannot be designed without considering this phenomenon. The findings allow evaluating more thoroughly the development of the simulation of pressure-driven membrane processes. Moreover, the review allows choosing the strategy of the simulation of the considered processes. Keywords: membrane, simulation, model, reverse osmosis nanofiltration, ultrafiltration, microfiltration.

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