Sludge reduction potential of metazoa in membrane bioreactors

2001 ◽  
Vol 44 (10) ◽  
pp. 197-202 ◽  
Author(s):  
B.S. Luxmy ◽  
T. Kubo ◽  
K. Yamamoto
Keyword(s):  
Treatment Plant ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Transmembrane Pressure ◽  
Sludge Reduction ◽  
Fouling Control ◽  
Steady Level ◽  
Effective Role ◽  
Real Wastewater ◽  
Reduction Capacity

In order to check the sludge reduction capacity of metazoa in a membrane bioreactor (MBR), pilot-scale studies were conducted. Three MBRs had been set in a wastewater treatment plant at Tokyo, Japan and they were receiving real wastewater. Initially pH inside the three MBRs was controlled as pH 7, 6 and 5 respectively. Then metazoa population was monitored along with MLSS change. It was found that the presence or absence of the metazoa population did not have any significant effect on the increasing pattern of MLSS. In the MBR with pH 6 highest accumulation of sludge was observed though a high and steady level of metazoa (1,000-2,000 per ml) was present there. But in this MBR a lot of metazoa attached in the membrane was also observed and here the increase in transmembrane pressure was less than in the other two. So, metazoa population especially the attached one in the membrane plays an effective role in fouling control of the membrane. Presence of attached media may provide a suitable niche for metazoa in the process. So, attached media known as DB lace was also inserted in MBRs for testing its capacity along with inoculum of oligochaete worms. Accumulation of sludge was not satisfactory in the attached string and it seems that inoculated worm could not adjust to the environment as they were not sludge originated. So, in the next experimental stage, attached media was inserted in the form of a bundle and this time no inoculation of worm was used. A steady metazoa population was observed in the system but the accumulation of sludge in the attached media was the same as before.

A pilot scale study of a sequencing batch reactor treating municipal wastewater operated via the UP-PND process

2008 ◽  
Vol 58 (2) ◽  
pp. 435-438 ◽  
Author(s):  
M. Kornaros ◽  
C. Marazioti ◽  
G. Lyberatos
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Treated Wastewater ◽  
Synthetic Wastewater ◽  
Second Step ◽  
Decentralized Wastewater Treatment ◽  
Real Wastewater

SBRs are usually preferred as small and decentralized wastewater treatment systems. We have demonstrated previously that using a frequent enough switching between aerobic and anoxic conditions and a specific to the treated wastewater aerobic to anoxic phase ratio, it is possible to by-pass the second step of nitrification (i.e. conversion of nitrite to nitrate nitrogen). This innovative process for nitrate by-pass has been branded as UP-PND (University of Patras-Partial Nitrification Denitrification) (WO 2006/129132). The proved methodology was successfully transferred from a lab-scale SBR reactor treating synthetic wastewater to a pilot-scale SBR system treating real wastewater. In this work we present the results from the operation of this pilot-scale SBR, constructed in the Wastewater Treatment Plant of Patras (Greece), using 6-hour, 8-hour and 12-hour cycles. It is demonstrated that three pairs of aerobic/anoxic phases with a relative duration of 1:2 (8-hour cycle) and 2:3 (12-hour cycle) secures the desired by-pass of nitrate production.

scholarly journals Aeration optimization of large-scale membrane bioreactors in a sewage treatment plant

2019 ◽  
Vol 14 (1) ◽  
pp. 198-202
Author(s):  
M. Tang ◽  
J. Liu
Keyword(s):  
Large Scale ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Membrane Bioreactors ◽  
Fouling Control ◽  
Conventional Activated Sludge ◽  
Plant Trial ◽  
Activated Sludge Processes ◽  
Discharge Criteria

Abstract Increasing stringency of environmental discharge standards has triggered an industry-wide inclination towards membrane bioreactors over conventional activated sludge processes to ensure fulfilment of environmental discharge criteria. Yet, despite its plentiful advantages, high aeration costs remain as a key deterrent to the widespread adoption of the MBR technology. This backdrop created an impetus for a wastewater treatment company to develop an efficient MBR air scouring protocol that can be realized in existing plants without retrofitting. Known as pulsed cyclic aeration, plant trial applications have demonstrated that fouling control and aeration savings can be improved by >30%, resulting in scouring energy consumptions that can be as low as 0.049 kWh/m3.

Detection and removal of estrogencity in membrane biological reactors

2006 ◽  
Vol 6 (6) ◽  
pp. 19-26 ◽  
Author(s):  
J.Y. Hu ◽  
X. Chen
Keyword(s):  
Estrogenic Activity ◽  
Solid Phase ◽  
Treatment Plant ◽  
Endocrine Disrupting Compounds ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Yeast Cells ◽  
Endocrine Disrupting ◽  
And Behavior ◽  
Fate And Behavior

Three pilot-scale submerged membrane bioreactors (MBRs) in a local wastewater treatment plant (K, M and Z) were studied with the objective to compare the performance of pre-denitrification MBR systems in eliminating the estrogenic activity of the effluent of primary clarifier. A total of 5 batches of samples, which included influent, effluent, supernatant and sludge from the respective aerobic and anoxic tanks were collected over the span. They were investigated by using the developed solid-phase extraction (SPE) protocol coupled with a modified yeast-based estrogen screen (YES) assay. From the results, it could be seen that M MBR demonstrated the best endocrine disrupting compounds (EDCs) removal efficiency. The fate and behavior of EDCs in MBR systems were fairly understood with estrogenic activity formation dominating in the anoxic tank and removal dominating in the aerobic tank. It is believed that the sorption of EDCs onto the sludge as well as biodegradation of EDCs might be the key mechanisms for the EDCs removal. The low response of YES when dealing with influent samples was mainly due to the inhibition and antagonist effects induced by the influent samples on yeast cells.

Long-term studies on hybrid ceramic microfiltration for treatment of surface water containing high dissolved organic matter

2013 ◽  
Vol 14 (2) ◽  
pp. 246-254 ◽  
Author(s):  
A. Abeynayaka ◽  
C. Visvanathan ◽  
S. Khandarith ◽  
T. Hashimoto ◽  
H. Katayama ◽  
...  
Keyword(s):  
Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Transmembrane Pressure ◽  
Raw Water ◽  
Operational Parameters ◽  
Polyaluminum Chloride ◽  
Filtration Cycle

This long-term pilot-scale study on the performance of ceramic microfiltration (CMF) was conducted at the Bangkhen water treatment plant (BWTP), with the raw water from Chaophraya River, Thailand. Raw water turbidity and dissolved organic carbon (DOC) were varied in the ranges of 20–210 NTU and 3.0–8.5 mg/L respectively. The hybrid pilot-scale CMF (Pilot-CMF) operational parameters were optimized with the aid of jar-tests and laboratory-scale CMF (Lab-CMF) operations. The systems were operated with various polyaluminum chloride dosages and filtration cycle times. Pilot-CMF provided excellent steady turbidity removal compared to the conventional water treatment process. DOC removal percentages of Pilot-CMF and the conventional process at the BWTP were 49% and 30% respectively. With different coagulant dosages, unique patterns in transmembrane pressure (TMP) variations were observed. The daily TMP increment under low turbidity conditions was 0.08 kPa/day. During rainy periods (turbidity over 100 NTU) the TMP increment reached 0.79 kPa/day. However, once the turbidity of raw water reaches normal conditions (30–60 NTU at the BWTP) the Pilot-CMF system recovers the TMP increment due to efficient backwashing.

Long-term use of the critical flux for fouling control in membrane bioreactors treating different industrial effluents: bench and pilot scale

2014 ◽  
Vol 55 (4) ◽  
pp. 859-869 ◽  
Author(s):  
Míriam Cristina Santos Amaral ◽  
Laura Hamdan de Andrade ◽  
Luzia Sergina França Neta ◽  
Wagner Guadagnin Moravia
Keyword(s):  
Industrial Effluents ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Critical Flux ◽  
Fouling Control

Comparison between ozonation and the OSA process: analysis of excess sludge reduction and biomass activity in two different pilot plants

2012 ◽  
Vol 66 (1) ◽  
pp. 185-192 ◽  
Author(s):  
Michele Torregrossa ◽  
Gaetano Di Bella ◽  
Daniele Di Trapani
Keyword(s):  
Municipal Wastewater ◽  
Process Analysis ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Anaerobic Sludge ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Biomass Activity ◽  
Excess Sludge Reduction ◽  
Ozone Contactor

The excess biomass produced during biological treatment of municipal wastewater represents a major issue worldwide, as its disposal implies environmental, economic and social impacts. Therefore, there has been a growing interest in developing technologies to reduce sludge production. The main proposed strategies can be categorized according to the place inside the wastewater treatment plant (WWTP) where the reduction takes place. In particular, sludge minimization can be achieved in the wastewater line as well as in the sludge line. This paper presents the results of two pilot scale systems, to evaluate their feasibility for sludge reduction and to understand their effect on biomass activity: (1) a pilot plant with an ozone contactor in the return activated sludge (RAS) stream for the exposition of sludge to a low ozone dosage; and (2) an oxic-settling-anaerobic (OSA) process with high retention time in the anaerobic sludge holding tank have been studied. The results showed that both technologies enabled significant excess sludge reduction but produced a slight decrease of biomass respiratory activity.

How to assess chemical oxidation efficiency

2004 ◽  
Vol 49 (4) ◽  
pp. 1-6 ◽  
Author(s):  
G. Bertanza ◽  
R. Pedrazzani
Keyword(s):  
Reaction Mechanisms ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Main Reaction ◽  
Additional Information ◽  
Activity Measurements ◽  
Real Wastewater ◽  
Oxidation Efficiency ◽  
Complex Organic

In this work, a real wastewater (deriving from the chemical-pharmaceutical field) was treated by means of H2O2/UV process under different conditions in a pilot-scale plant. Several methods were used in order to assess the oxidation efficiency and to understand the main reaction features. It was shown that non-conventional COD measurement (with a 75°C digestion of the sample) is helpful for understanding reaction mechanisms, when integrated with TOC and COD analyses and GC-MS determinations. For the biodegradability study, beside BOD (5 and 20 days) measurements, OUR and AUR tests provide additional information especially when wastewater is tested by taking the activated sludge from the treatment plant which should really be fed with it. Finally, dehydrogenase activity measurements can show the presence of complex organic matter, which may be degraded only by an acclimated biomass.

Application of powdered activated carbon (PAC) for membrane fouling control in a pilot-scale MBR system

2017 ◽  
Vol 75 (10) ◽  
pp. 2350-2357 ◽  
Author(s):  
A. I. Zouboulis ◽  
P. K. Gkotsis ◽  
D. X. Zamboulis ◽  
M. G. Mitrakas
Keyword(s):  
Activated Carbon ◽  
Membrane Fouling ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Powdered Activated Carbon ◽  
Short Term ◽  
Batch Mode ◽  
Fouling Control ◽  
Integrated Methodology ◽  
Microbial Products

Membrane fouling is considered to be the most serious drawback in wastewater treatment when using membrane bioreactors (MBRs), leading to membrane permeability decrease and efficiency deterioration. This work aims to develop an integrated methodology for membrane fouling control, using powdered activated carbon (PAC), which will enhance the adsorption of soluble microbial products (SMP) and improve membrane filterability, by altering the mixed liquor's characteristics. Reversible fouling was assessed in terms of sludge filterability measurements, according to the standard time-to-filter (TTF) method, while irreversible fouling was assessed in terms of SMP removal. Results showed that the addition of PAC at the concentration of 3 g/L in the mixed liquor reduced SMP concentration and enhanced substantially the sludge filterability. Furthermore, the TTFPAC/TTFno PAC ratios were lower, than the corresponding SMPPAC./SMPno PAC ratios, indicating that the batch-mode, short-term addition of PAC promotes the reversible, rather than the irreversible fouling mitigation.

scholarly journals Treatment of Wastewater from a Food and Beverage Industry Using Conventional Wastewater Treatment Integrated with Membrane Bioreactor System: A Pilot-Scale Case Study

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 456
Author(s):  
Sabrina Ng Muhamad Ng ◽  
Syazwani Idrus ◽  
Amimul Ahsan ◽  
Tuan Nurfarhana Tuan Mohd Marzuki ◽  
Siti Baizura Mahat
Keyword(s):  
Wastewater Treatment ◽  
Industrial Effluent ◽  
Treatment Plant ◽  
Quality Measurement ◽  
Pilot Scale ◽  
Suspended Solid ◽  
Transmembrane Pressure ◽  
Chemical Cleaning ◽  
Effluent Quality ◽  
Food And Beverage

This study compares the performance of the Hollow Fiber (HF) and Flat Sheet (FS) types of membrane bioreactors (MBRs) for the treatment of food and beverage (F&B) industry wastewater in a pilot-scale study of a wastewater treatment plant (WWTP). HF and FS membrane configurations were evaluated at two different Mixed Liquor Suspended Solid (MLSS) levels: 6000 mg/L and 12,000 mg/L. The performance of each configuration was evaluated in terms of Chemical Oxygen Demand (COD) and Total Suspended Solid (TSS) removals for effluent quality measurement. The transmembrane pressure (TMP), flux rate, and silt density index (SDI) were monitored and calculated for membrane fouling assessment. The results show that the rejection rates of COD and TSS for HF and FS membrane types were more than 84% for the two different MLSS levels. During the study, the HF membrane recorded 0.3 bar transmembrane pressure, which complies with the recommended range (i.e., two to three times of chemical cleaning). On the other hand, the FS membrane operates without chemical cleaning, and the TMP value was below the recommended range at 0.2 bar. It was found that the flux values recorded for both the HF and FS systems were within the recommended range of 40 L/m2/h. Analysis of SDI revealed that the calculated index ranged between 1 and 2.38 and was within the allowable limit of 3. Both types of MBR consistently achieved an 80% to 95% rejection rate of COD and TSS. Effluent quality measurement of treated F&B wastewater in this pilot-scale study using a WWTP integrated with an MBR indicated a good achievement with compliance with the Malaysia industrial effluent discharge standards.

Heating up trickling filters to tackle cold weather conditions

2000 ◽  
Vol 41 (1) ◽  
pp. 163-166 ◽  
Author(s):  
W. Gebert ◽  
P.A. Wilderer
Keyword(s):  
Waste Heat ◽  
Treatment Plant ◽  
Weather Conditions ◽  
Pilot Scale ◽  
Cold Weather ◽  
Filling Material ◽  
Trickling Filter ◽  
Biofilm Thickness ◽  
Trickling Filters ◽  
Biofilm Support

The investigated effects of heating the filling material in trickling filters were carried out at the Ingolstadt wastewater treatment plant, Germany. Two pilot scale trickling filters were set up. Heat exchanger pipings were embedded in the filter media of one of these trickling filters, and the temperature in the trickling filter was raised. The other trickling filter was operated under normal temperature conditions, and was used as a control. The results clearly demonstrate that the performance of trickling filters cannot be constantly improved by heating the biofilm support media. A sustained increase of the metabolic rates did not occur. The decrease of the solubility of oxgen in water and mass transfer limitations caused by an increase of the biofilm thickness are the main reasons for that. Thus, the heating of trickling filters (e.g. by waste heat utilization) in order to increase the capacity of trickling filters under cold weather conditions cannot be recommended.

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