Experiment of Polyester Wastewater Treatment by Aerobic Membrane Bioreactor and an Engineering Application

2012 ◽  
Vol 518-523 ◽  
pp. 2130-2137
Author(s):  
Si Hao Lv ◽  
Hui Chang ◽  
Zhi Hui Liang ◽  
Yan Yan Zeng ◽  
Hong Bo Fan
Keyword(s):  
Water Quality ◽  
Pilot Study ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Loading Rate ◽  
Engineering Application ◽  
Full Scale ◽  
Effluent Water ◽  
Small Influence ◽  
Volumetric Loading

A pilot study was carried out to evaluate the application of aerobic submerged MBR in treating polyester wastewater and a full scale system in which MBR was adopted as the key aspect was put forward to treat the polyester wastewater of Zhuhai Yuhua Polyester co., Ltd., China. The pilot study revealed that HRT could be affected by the influent COD, and a HRT larger than 36h was proposed for treating polyester wastewater by MBR. Volumetric loading rate and sludge loading rate ranged in 0.7-2.0 kgCOD/m3•d and 0.09~0.24 kgCOD/ kgMLSS•d respectively were of small influence on the COD removal. DO in the range of 2.5-4.0 mg/L seemed to be optimal for avoiding limitations due to oxygen concentration and creating an effective turbulence. The modified full scale system which includes anaerobic digesting tank and MBR followed by a stabilization pond was verified to be effective to treat the polyester wastewater in the latest two years. The results illustrated that the effluent water quality could meet the discharge limits of water pollutants (DB 44/26-2001) which was established in Guangdong, China. Observed sludge yield of the system fluctuated between 0.10-0.18 gMLSS/gCOD and averaged at 0.137 gMLSS/gCOD. The membrane permeate at around 10 L/m2h, TMP of less than 0.7bar, and total mixed liquor suspended solids (MLSS) between 6-7g/L were suitable to operate the MBR.

The effect of mixed liquor suspended solids (MLSS) on biofouling in a hybrid membrane bioreactor for the treatment of high concentration organic wastewater

2011 ◽  
Vol 63 (8) ◽  
pp. 1701-1706 ◽  
Author(s):  
A. Damayanti ◽  
Z. Ujang ◽  
M. R. Salim ◽  
G. Olsson
Keyword(s):  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Loading Rate ◽  
Removal Rate ◽  
Transmembrane Pressure ◽  
High Concentration ◽  
Critical Flux ◽  
Mixed Liquor ◽  
Palm Oil Mill ◽  
Volumetric Loading

Biofouling is a crucial factor in membrane bioreactor (MBR) applications, particularly for high organic loading operations. This paper reports a study on biofouling in an MBR to establish a relationship between critical flux, Jc, mixed liquor suspended solids (MLSS) (ranging from 5 to 20 g L−1) and volumetric loading rate (6.3 kg COD m−3 h−1) of palm oil mill effluent (POME). A lab-scale 100 L hybrid MBR consisting of anaerobic, anoxic, and aerobic reactors was used with flat sheet microfiltration (MF) submerged in the aerobic compartment. The food-to-microorganism (F/M) ratio was maintained at 0.18 kg COD kg−1 MLSSd−1. The biofouling tendency of the membrane was obtained based on the flux against the transmembrane pressure (TMP) behaviour. The critical flux is sensitive to the MLSS. At the MLSS 20 g L−1 the critical flux is about four times lower than that for the MLSS concentration of 5 g L−1. The results showed high removal efficiency of denitrification and nitrification up to 97% at the MLSS concentration 20 g L−1. The results show that the operation has to compromise between a high and a low MLSS concentration. The former will favour a higher removal rate, while the latter will favour a higher critical flux.

scholarly journals Performance of a full-scale ceramic MBR system to treat domestic sewage

2018 ◽  
Vol 13 (3) ◽  
pp. 589-593 ◽  
Author(s):  
T. Niwa ◽  
R. Yin ◽  
M. H. Oo ◽  
H. Noguchi ◽  
T. Watanabe ◽  
...  
Keyword(s):  
Water Quality ◽  
Membrane Bioreactor ◽  
Production Capacity ◽  
Domestic Sewage ◽  
Full Scale ◽  
Stable Operation ◽  
Water Reclamation ◽  
Membrane Systems ◽  
Nominal Capacity ◽  
Net Flux

Abstract Application of membrane technology for water reclamation has grown significantly in recent years due to reduced footprint size and more consistent product water quality. For a membrane bioreactor (MBR) system, it is critical for it to be robust to allow membrane systems to operate at higher flux without significant increase of trans-membrane pressure (TMP). A full-scale ceramic MBR system was installed at Changi Water Reclamation Plant (CWRP) as part of an MBR retrofit project to increase treatment capacity without expanding the plant's footprint. The nominal capacity of the ceramic MBR system is 15,000 m3/d. The system has been successfully operating since January 2017 with a net flux of 30–60 L/m2-hr (LMH). Stable operation was observed at nominal production capacity for more than 3 months. During that period, the TMP was stable in the range of 9–14 kPa for Tank A and 10–17 kPa for Tank B. Permeate turbidity was recorded in the range of 0.04–0.06 NTU for both Tank A and Tank B.

Influence of sludge properties and hydraulic loading on the performance of secondary settling tanks - full-scale operational results

2004 ◽  
Vol 50 (7) ◽  
pp. 179-186 ◽  
Author(s):  
R.J. Vestner ◽  
F. Wolfgang Günthert
Keyword(s):  
Suspended Solids ◽  
Loading Rate ◽  
Settling Tank ◽  
Full Scale ◽  
Volume Loading ◽  
Solids Concentration ◽  
Sludge Properties ◽  
And Performance ◽  
Secondary Settling ◽  
Flocculation Time

Full-scale investigations at a WWTP with a two-stage secondary settling tank process revealed relationships between significant operating parameters and performance in terms of effluent suspended solids concentration. Besides common parameters (e.g. surface overflow rate and sludge volume loading rate) feed SS concentration and flocculation time must be considered. Concentration of the return activated sludge may help to estimate the performance of existing secondary settling tanks.

The Effects on Phosphorus Removal and Membrane Pollution by Adding PAC and Ca2+ into MBR under Different Dosing Methods

2015 ◽  
Vol 733 ◽  
pp. 342-345
Author(s):  
Hai Rong Mi ◽  
Zhi Liu Zhang ◽  
Zhen Chao
Keyword(s):  
Water Quality ◽  
Significant Influence ◽  
Membrane Fouling ◽  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Average Concentration ◽  
Effluent Water ◽  
Submerged Membrane Bioreactor ◽  
Continuous Dosing ◽  
Polyaluminium Chloride

This article studied effluent water quality and membrane fouling by adding different concentration of polyaluminium chloride (PAC) into the submerged membrane bioreactor (MBR) in different dosing ways, and examined the effects on coagulation by adding Ca2+. Experiment results show that dosing ways of PAC have no significant influence on CODCr and NH3-N. When the concentration of PAC was 45mg/L and the continuous dosing way was chosen, the average concentration of pollutant was lowest, total phosphorus (TP) removal efficiency was highest, and the membrane fouling was effectively slowed. When the Ca2+ concentration was 20mg/L, the coagulation effect was the best, water quality was stable, and the membrane fouling was largely reduced.

Discfiltration and ozonation for reduction of nutrients and organic micro-pollutants from wastewater – a pilot study

2014 ◽  
Vol 9 (4) ◽  
pp. 475-482 ◽  
Author(s):  
J. Väänänen ◽  
F. Nilsson ◽  
J. la Cour Jansen ◽  
M. Hörsing ◽  
M. Hagman ◽  
...  
Keyword(s):  
Water Quality ◽  
Suspended Solids ◽  
Active Material ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Secondary Effluent ◽  
Effluent Water ◽  
Ozone Dose ◽  
Pollutants Removal ◽  
Micro Pollutants

The combination of coagulation/flocculation and discfiltration with ozonation to reduce nutrients and organic micro-pollutants in secondary effluent was studied in pilot scale at Lundåkraverket wastewater treatment plant in Landskrona, Sweden. With a chemical dose of 4 gAl3+/m3 and 1.5 g/m3 cationic polymer as active material effluent water quality with regards to total phosphorous (Tot-P), suspended solids and turbidity were 0.03, 2 mg/l and 0.5 Nephelometric Turbidity Units (NTU) in average. The effluent water quality was similar whether ozonation with an applied ozone dose of 2–9 gO3/m3 was performed prior to or after coagulation/flocculation/discfiltration. The results were corresponding to removal efficiencies for the coagulation/flocculation/discfiltration process of 94, 74 and 85% for Tot-P, suspended solids and turbidity, respectively. For organic micro-pollutants removal, it was found to be beneficial to perform coagulation/flocculation/discfiltration prior to ozonation as the ozone requirements were lowered for the dosing intervals applied. The removal was in the range of 38–98% depending on process configuration and ozone dose.

Effects of Complete Sludge Retention on Biomass Build-up in a Membrane Bioreactor

2005 ◽  
Vol 52 (10-11) ◽  
pp. 369-375 ◽  
Author(s):  
A. Pollice ◽  
G. Laera
Keyword(s):  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Operating Conditions ◽  
Municipal Sewage ◽  
Equilibrium Conditions ◽  
Load Variations ◽  
Loading Rates ◽  
Biomass Activity ◽  
Two Parameters ◽  
Volumetric Loading

The work reports the main results of an experimental activity aimed at evaluating the performance of a membrane bioreactor with complete sludge retention and the characteristics of its biomass. The bench scale system was started-up without any sludge inoculum and fed on real municipal sewage in order to favour biomass selection based on the imposed operating conditions. Process performance was evaluated in terms of COD removal (above 90% on average) and nitrification under two pre-determined volumetric loading rates (0.8 and 1.7gCOD Lreact.−1d−1 on average). The biomass was evaluated in terms of growth, accumulation of inert solids, and bacterial activity. The latter was measured through respirometric tests. The results showed that the suspended solids concentrations (SS) under equilibrium were proportional to the volumetric loading rates in both the experimental periods considered and a relationship between these two parameters was proposed. Also, the organic loading rates reached the same equilibrium value of 0.12gCOD gTSS−1d−1 in the two periods. Moreover, the system showed very limited sludge production under equilibrium conditions (0.12gVSS gCODrem−1) and low biomass activity, although it readily responded to load variations.

UASB-reactor in the fruit juice industry

1997 ◽  
Vol 36 (6-7) ◽  
pp. 407-414 ◽  
Author(s):  
Ute Austermann-Haun ◽  
Carl Franz Seyfried ◽  
Karl-Heinz Rosenwinkel
Keyword(s):  
Removal Efficiency ◽  
Industrial Wastewater ◽  
Fruit Juice ◽  
Loading Rate ◽  
Full Scale ◽  
Cod Removal ◽  
Uasb Reactor ◽  
Cod Removal Efficiency ◽  
Pre Treatment ◽  
Volumetric Loading

This paper presents experiences with a full scale UASB-reactor in a fruit juice factory. The focus is on demonstrating that a UASB-reactor is as suitable for campaign industries running only 2 months a year with higher concentrated wastewater as well as for the time outside the campaign when the wastewater concentrations are very low (average COD 1000 mg/l). A number of operating results and recommendations are given, resulting from the experiences in order to show solutions for handling these very different situations. Examples of recommendations are: discontinuous feeding 8 hours a day outside the campaign, removal of pellet sludge at the end of the campaign. These frame conditions provided a COD removal efficiency in the UASB-reactor consistently above 80% throughout the year. Furthermore, it is shown that the anaerobic pre-treatment of industrial wastewater is the cheapest way in regard to the running expenses. Another point of research was the co-fermentation of the kieselguhre-sludge-mixture. Although only 10% of the load was based on this substrate at a volumetric loading rate of 3 kg COD/(m3 · d), there was a quick drop in pH to a level of 3.5 and the pellet structure of the biomass got lost.

Membrane Bioreactor Effluent Water Quality and Technology – Organics, Nutrients and Microconstituents Removal

2010 ◽  
Vol 2010 (10) ◽  
pp. 5880-5890
Author(s):  
Zakir Hirani ◽  
Joan Oppenheimer ◽  
James DeCarolis ◽  
Ayla Kiser ◽  
Bruce Rittmann
Keyword(s):  
Water Quality ◽  
Membrane Bioreactor ◽  
Effluent Water

Comparison of the 1D flux theory with a 2D hydrodynamic secondary settling tank model

2004 ◽  
Vol 50 (7) ◽  
pp. 195-204 ◽  
Author(s):  
G.A. Ekama ◽  
P. Marais
Keyword(s):  
Surface Area ◽  
Loading Rate ◽  
Settling Tank ◽  
Full Scale ◽  
Tank Model ◽  
Marked Influence ◽  
Solids Loading ◽  
Small Influence ◽  
Secondary Settling ◽  
Sloping Bottom

The applicability of the 1D idealized flux theory (1DFT) for design of secondary settling tanks (SSTs) is evaluated by comparing its predicted maximum surface overflow (SOR) and solids loading (SLR) rates with that calculated from the 2D hydrodynamic model SettlerCAD using as a basis 35 full scale SST tress tests conducted on different SSTs with diameters from 30 to 45m and 2.25 to 4.1m side water depth, with and without Stamford baffles. From the simulations, a relatively consistent pattern appeared, i.e. that the 1DFT can be used for design but its predicted maximum SLR needs to be reduced by an appropriate flux rating, the magnitude of which depends mainly on SST depth and hydraulic loading rate (HLR). Simulations of the sloping bottom shallow (1.5-2.5 m SWD) Dutch SSTs tested by STOWa and the Watts et al. SST, all with doubled SWDs, and the Darvill new (4.1 m) and old (2.5 m) SSTs with interchanged depths, were run to confirm the sensitivity of the flux rating to depth and HLR. Simulations with and without a Stamford baffle were also done. While the design of the internal features of the SST, such as baffling, have a marked influence on the effluent SS concentration for underloaded SSTs, these features appeared to have only a small influence on the flux rating, i.e. capacity, of the SST. In the meantime until more information is obtained, it would appear that from the simulations so far that the flux rating of 0.80 of the 1DFT maximum SLR recommended by Ekama and Marais remains a reasonable value to apply in the design of full scale SSTs – for deep SSTs (4 m SWD) the flux rating could be increased to 0.85 and for shallow SSTs (2.5 m SWD) decreased to 0.75. It is recommended that (i) while the apparent interrelationship between SST flux rating and depth suggests some optimization of the volume of the SST, that this be avoided and that (ii) the depth of the SST be designed independently of the surface area as is usually the practice and once selected, the appropriate flux rating is applied to the 1DFT estimate of the surface area.

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