Biodegradability of some nitrogenous heterocyclic compounds and co-degradation with phenol by denitrifiers in anoxic sludge reactor

Phenol and nitrogenous heterocyclic compounds (NHCs) are typical organic pollutants in coal gasification wastewater which are difficult to deal with. Unlike phenol, the stable molecular structure of NHCs make them nearly impossible to degrade under aerobic or anaerobic condition. In this paper, biodegradation of phenol and NHCs as carbon sources for denitrification was studied in a laboratory-scale anoxic reactor. Denitrifiers could degrade 490 mg/L phenol and 321.5 mg/L NO3−-N within 12 hours with removal efficiencies of 99.8% and 99.6%, respectively. The inhibition of pyridine on the microbes could be reduced by adding phenol into influent and the experimental results showed that pyridine could be degraded as the sole carbon source with the maximum organic loading rate of 4.38 mg/(g MLSS·h) (MLSS: mixed liquor suspended solids). When phenol was included as a growth substrate, the degradation performance of quinoline and pyrrole was improved due to co-degradation, and removal rate of NHCs increased according with increment of phenol in influent.

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The Potential of Phosphorus Removal in UASB Reactor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.3515 ◽

2011 ◽

Vol 130-134 ◽

pp. 3515-3517

Author(s):

Ping Lu ◽

Tao Ding ◽

Jin Ye Li ◽

Jin Xia Mu

Keyword(s):

Phosphorus Removal ◽

Loading Rate ◽

Removal Rate ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Organic Loading ◽

Effluent Concentration ◽

Biological Phosphorus ◽

Main Factor

The potential of phosphorus removal rate was investigated using a lab scale UASB reactor The volumetric phosphorus removal rate was up to 20 mgP/L•d, and the phosphorus effluent concentration was below 0.5 mgP/L under high organic loading rate. Biological phosphorus assimilation could be the main pathways of phosphorus removal in UASB reactor, and the organic loading rate could be the main factor affecting phosphorus removal.

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STUDY ON CAPACITY OF A TRICKLING FILTER USING BIOCHAR MEDIUM FOR TREATING WASTEWATER FROM AN CUU MARKET IN HUE CITY, VIETNAM

HUE UNIVERSITY JOURNAL OF SCIENCE AGRICULTURE AND RURAL DEVELOPMENT ◽

10.26459/hueuni-jard.v129i3c.5624 ◽

2020 ◽

Vol 129 (3C) ◽

Author(s):

Nguyễn Thị Cẩm Yến

Keyword(s):

Wastewater Treatment ◽

Organic Pollutants ◽

Suspended Solids ◽

Loading Rate ◽

Organic Loading Rate ◽

Organic Loading ◽

Trickling Filter ◽

Untreated Wastewater ◽

Investment Capital ◽

Removal Efficiencies

Abstract: Pollution caused by market wastewater has occurred for many years in Vietnam. In particular, untreated wastewater from a riverside market is often directly discharged into a river, increasing loads of pollutants for the river. Every day, An Cuu market wastewater is averagely discharged about 19 cubic metres into An Cuu river. However, a wastewater treatment system has not been yet built at the market due to many reasons including the lack of investment capital. A Trickling filter (TF) consisting of a fix bed of biochar is a cost acceptable technology, effectively treating parameters like organic pollutants, nutrients and suspended solids. In this study, a model of TF using biochar medium for An Cuu market wastewater treatment were effectively operated with the organic loading rate (OLR) varying from 188 to 550 gBOD5.m-3.day-1 and the hydraulic loading rate (HLR) from 532 to 1899 L.m-2.day-1. The biochar trickling filter showed high removal efficiencies: 97% BOD5, 92% COD, 97% TSS, 66% PTot and 62% NTot.Key words: An Cuu market, wastewater treatment, biochar trickling filter, Vietnam

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Impact of Organic Loading Rate on Performance and Methanogenic Microbial Communities of a Fixed-Bed Anaerobic Reactor at 4 °C

Water ◽

10.3390/w12092586 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2586

Author(s):

Hongyan Zhao ◽

Feifan Yan ◽

Xue Li ◽

Renzhe Piao ◽

Weidong Wang ◽

...

Keyword(s):

Acid Content ◽

Loading Rate ◽

Biogas Production ◽

Removal Rate ◽

Fixed Bed ◽

Organic Loading Rate ◽

Rrna Gene ◽

Organic Loading ◽

16S Rrna Gene Analysis ◽

Anaerobic Reactor

We investigated the feasibility of producing biogas in a fixed-bed anaerobic reactor at 4 °C with a gradual increase in organic loading rate (OLR). Reactor efficiency was highest when OLR was 4.33 kg/m3·d, whereas the reactor acidification occurred when OLR was 4.67 kg/m3·d. The values of methane content, biogas production, chemical oxygen demand (COD) removal rate, biogas production rate, acetic acid content, and propionic acid content were 69.3%, 5.33 L, 59.8%, 1.03 L/OLR, 0.17 g/L, and 1.15 g/L, respectively. The pH was stable and ranged from 7.2 to 6.8 when the reactor was operating at 4 °C during OLR increase. The 16S rRNA gene analysis revealed that the dominant archaea were Methanosaetaceae at 30 °C. At 4 °C, the dominant archaea were Methanomicrobiales, which were more abundant in adhering sludge compared to settled sludge. In conclusion, operating a fixed-bed anaerobic reactor at psychrophilic temperatures is more suitable.

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The effect of organic loading rate on the aerobic granulation: the development of shear force theory

Water Science & Technology ◽

10.2166/wst.2003.0610 ◽

2003 ◽

Vol 47 (11) ◽

pp. 235-240 ◽

Cited By ~ 20

Author(s):

J.-H. Tay ◽

S. Pan ◽

S.T.L. Tay ◽

V. Ivanov ◽

Y. Liu

Keyword(s):

Shear Force ◽

Loading Rate ◽

Removal Rate ◽

Force Balance ◽

Organic Loading Rate ◽

Aerobic Granules ◽

Organic Loading ◽

Aerobic Granulation ◽

Close Relationship ◽

Cod Removal Rate

The effect of organic loading rate (OLR) on aerobic granulation was studied by adopting three column-shaped, sequential aerobic sludge blanket reactors (SASBR). The reactors had been fed with laboratory prepared, synthetic dextrose-nutrient broth substrate. Experimental results showed clearly that the formation, characteristics and stability of aerobic granules had a close relationship with the strength of OLR applied. Aerobic granules appeared firstly under the OLR of 4 kg COD×(m3·day)−1. The system stabilization was demonstrated by its little-changed amount and morphology of granules. The characteristics of the stabilized granules were: 5.4 mm in mean diameter, 1.29 in roundness, 118 mg O2·(mg VSS·hr)−1 in SPOUR. The respective biomass SVI was 50 mL·(g MLVSS)−1 and the averaged COD removal rate was 95%. Under the OLR of 8 kg COD·(m3·day)−1, granules appeared two days later than those for 4 kg COD·(m3·day)-1 and they always coexisted with flocs. The formed granule bed was not as compact as that under 4 kg COD·(m3·day)−1. There were no granules formed under the OLR of 1 kg COD·(m3·day)−1. Instead, flocs with rather loose structure dominated reactor mixed-liquor. The respective SVI's were 65 and 138 mL·(g MLVSS)−1 under OLR of 8 and 1 kg COD·(m3·day)−1. It was proposed that the growth and maintenance of aerobic granules follow the shear force balance theory. Under the OLR of 4 kg COD·(m3·day)−1, a balance was reached between the aeration shear force and organic loading rate. Under this favored condition aerobic granules formed quickly and, became stabilized with the experimental parameters remained unchanged.

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The Parameters Control of Recirculation Treatment for Leachate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1015.340 ◽

2014 ◽

Vol 1015 ◽

pp. 340-345

Author(s):

Bao Jun Jiang ◽

Zhu Jun Tian ◽

Jin Ming Jiang

Keyword(s):

Loading Rate ◽

Removal Rate ◽

Important Influence ◽

Organic Loading Rate ◽

Major Influence ◽

Organic Loading ◽

Hydraulic Loading Rate ◽

Hydraulic Loading ◽

N Removal ◽

Influence Parameter

The three parameters, hydraulic loading rate, organic loading rate and recirculation times have important influence on the efficiency of recirculation treatment, the recirculation experiment research removal of COD under different hydraulic loading rate, organic loading rate and recirculation times by the experimental devices built in landfill in a civil city. The result indicated that the hydraulic loading rate is the major influence parameter for leachate recirculation. When hydraulic loading rate was 30ml/L·d~200ml/L·d, COD removal efficiency was 70%~94%; However, organic loading rate has comparative minor influence on recirculation treatment; the apt recirculation times are 3 or 4 in a day; C/N of recirculation leachate have important influence on NH3-N removal rate, but the effect of hydraulic loading rate and recirculation times on NH3-N removal rate aren’t obvious.

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Performance of a Full-Scale Anaerobic Digestion on Bakery Wastewater Treatment : Effect of Modified Distribution System

Jurnal Riset Teknologi Pencegahan Pencemaran Industri ◽

10.21771/jrtppi.2020.v11.no1.p12-18 ◽

2020 ◽

Vol 11 (1) ◽

pp. 12-18

Author(s):

Hanny Vistanty ◽

Rizal Awaludin Malik ◽

Aris Mukimin

Keyword(s):

Anaerobic Digestion ◽

Distribution System ◽

Suspended Solids ◽

Loading Rate ◽

Oxygen Demand ◽

Degradation Process ◽

Full Scale ◽

Organic Loading Rate ◽

Organic Loading ◽

External Circulation

The effectiveness of a full-scale anaerobic digestion pretreatment was evaluated and the effect of wastewater distribution system was determined on the performance of bakery wastewater (BW) treatment. The BW was fed to 3 series of anaerobic compartments as the main degradation process. The distribution system of first compartment was modified and circulated to enhance contact and efficiency. While the effluent of last compartment was partly returned to the first compartment as an external circulation and the other part was further processed in activated sludge under aerobic conditions. The overall system was able to remove chemical oxygen demand (COD), total suspended solids (TSS), and biochemical oxygen demand (BOD) up to 97.7%, 99.7%, and 99.6%, respectively, at maximum organic loading rate of 6.3 kg COD/m3day. High removal of pollutants indicated that modified distribution of circulation is advantageous to the BW treatment

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Anaerobic Treatment of Polyethylene Terephthalate (PET) Wastewater from Lab to Full Scale

Water Science & Technology ◽

10.2166/wst.1999.0426 ◽

1999 ◽

Vol 40 (8) ◽

pp. 229-236 ◽

Cited By ~ 4

Author(s):

F. Fdz-Polanco ◽

M. D. Hidalgo ◽

M. Fdz-Polanco ◽

P. A. García Encina

Keyword(s):

Polyethylene Terephthalate ◽

Loading Rate ◽

Treatment Plant ◽

Textile Wastewater ◽

Anaerobic Treatment ◽

Cod Removal ◽

Organic Loading Rate ◽

Foam Formation ◽

Organic Loading ◽

Start Up

In the last decade Polyethylene Terephthalate (PET) production is growing. The wastewater of the “Catalana de Polimers” factory in Barcelona (Spain) has two main streams of similar flow rate, esterification (COD=30,000 mg/l) and textile (COD=4000 mg/l). In order to assess the anaerobic treatment viability, discontinuous and continuous experiments were carried out. Discontinuous biodegradability tests indicated that anaerobic biodegradability was 90 and 75% for esterification and textile wastewater. The textile stream revealed some tendency to foam formation and inhibitory effects. Nutrients, micronutrients and alkali limitations and dosage were determined. A continuous lab-scale UASB reactor was able to treat a mixture of 50% (v) esterification/textile wastewater with stable behaviour at organic loading rate larger than 12 g COD/l.d (0.3 g COD/g VSS.d) with COD removal efficiency greater than 90%. The start-up period was very short and the recuperation after overloading accidents was quite fast, in spite of the wash-out of solids. From the laboratory information an industrial treatment plant was designed and built, during the start-up period COD removal efficiencies larger than 90% and organic loading rate of 0.6 kg COD/kg VSS.d (5 kg COD/m3.d) have been reached.

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Performance of an anaerobic baffled reactor (ABR) as a hydrolysis-acidogenesis unit in treating landfill leachate mixed with municipal sewage

Water Science & Technology ◽

10.2166/wst.2000.0253 ◽

2000 ◽

Vol 42 (12) ◽

pp. 115-121 ◽

Cited By ~ 13

Author(s):

B. Wang ◽

Y. Shen

Keyword(s):

Landfill Leachate ◽

Loading Rate ◽

Granular Sludge ◽

Operational Performance ◽

Municipal Sewage ◽

Organic Loading Rate ◽

Stable Operation ◽

Organic Loading ◽

Anaerobic Baffled Reactor ◽

Biological Treatability

A study on the performance of an Anaerobic Baffled Reactor(ABR) as a hydrolysis-acidogenesis unit in treating the mixed wastewater of landfill leachate and municipal sewage in different volumetric ratios was carried out. The results showed that ABR substantially improved the biological treatability of the mixed wastewater by increasing its BOD5/COD ratio to 0.4–0.6 from the initial values of 0.15–0.3. The formation of bar-shaped granular sludge of 0.5–5 mm both in diameter and length with an SVI of 7.5–14.2 ml/g was observed in all compartments of the ABR when the organic loading rate reached 4.71 kgCOD/m3 · d. The effects of the ratios of NH4+-N/COD and COD/TP in mixed wastewater on the operational performance were also studied, from which it was found that a reasonable NH4+-N/COD ratio should be lower than 0.02, and the phosphorus supplement was needed when the volumetric ratio was higher than 4:6 for stable operation of ABR.

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