Mechanism of efficient nutrient removal and microbial analysis of a combined anaerobic baffled reactor–membrane bioreactor process

Wu, Peng; Ji, Xiaoqing; Song, Xu Yan; Shen, Yun

doi:10.1007/s13762-013-0347-4

Cited by 8 publications

(2 citation statements)

References 33 publications

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“…First, nitrification is performed by autotrophic microorganisms in aerobic conditions. Then, denitrification is performed in anoxic conditions by heterotrophic microorganisms (Fu et al 2009a, b;Wei et al 2012;Wu et al 2014). In the anaerobic phase, phosphate-accumulating organisms (PAOs) sequester organic substances, especially volatile fatty acids (VFAs), in their cells as polyhydroxyalkanoates (PHAs).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of nutrients in a novel anaerobic–anoxic/aerobic sequencing reactor: removal of nutrients in a novel reactor

Azhdarpoor

Mohammadi

Dehghani

2015

Int. J. Environ. Sci. Technol.

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Discharging wastewater contaminated with nitrogen and phosphorus compounds (nutrients) can be harmful to both human health and the environment. The present study investigated the efficiency of removing total nitrogen, total phosphate, and chemical oxygen demand using a novel reactor design. The reactor was an anaerobic-anoxic/aerobic sequencing batch reactor with continuous influent and discontinuous outlet. The operation consisted of four phases. Phases 3 and 4 had mixing cycles, whereas phases 1 and 2 only had aeration, settling, and discharge cycles. Phase 4 was the most effective. The average removal efficiencies for chemical oxygen demand, NH 4? , total nitrogen, and total phosphate in Phase 4 were 92, 91, 86, and 85 %, respectively. This phase comprised 225 min of intermittent aeration time, 165 min of intermittent mixing time, and 90 min of settling and discharge. In addition to high efficiency in nutrient removal, the reactor had other advantages, including continuous flow and performance in all phases.

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Section: Introductionmentioning

confidence: 99%

Simultaneous removal of nutrients in a novel anaerobic–anoxic/aerobic sequencing reactor: removal of nutrients in a novel reactor

Azhdarpoor

Mohammadi

Dehghani

2015

Int. J. Environ. Sci. Technol.

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“…9,10 The RO Reject was allowed to pass through the reactor and the final effluent from the reactor was analyzed. [11][12][13][14] The secondary treated anaerobic sewage sludge was used as a seeding material in order to enhance the growth of microorganisms for proper anaerobic digestion as rich recycle culture within the reactor. 15 …”

Section: Introductionmentioning

confidence: 99%

Analysis and Treatment of Reverse Osmosis (Ro) Reject From Dye Industries Using Anaerobic Baffled Reactor

2017

RJC

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Reverse osmosis (RO) is one of the advanced wastewater treatment processes that remove the concentrate in the form of dissolved impurities in raw waste water. The treated reject released during the RO process remain a major polluting problem. The RO reject, with high solid concentration, needs maximum purification. It is one major problem prevailing in the dye industry where RO was mainly used as a tertiary treatment to achieve zero discharge effluent. Approximately one-third of the total quantity of wastewater concentration was rejected and collected as RO reject in dye industries. This concentrated RO rejects stream seems to be more toxic than non-treated wastewater. To overcome this difficulty anaerobic baffled wall reactor (ABR) study was initiated. It was necessary to find a potential solution to treat RO reject with by-product recovery as the existing methods for treating RO reject is open dumping in the sea, discharge in sewer or swamps, as a dewatering process, disposal in water bodies. ABR study was carried out in a lab scale using RO as a feeding material. In this investigation, the anaerobic bio treatment process was carried out to reduce the Biological Oxygen Demand (BOD) concentration. ABR has the advantage of operating at even reduced flow rates to ensure contact between the RO reject feed and micro-organism. As a result of anaerobic digestion, ABR will produce a biogas as a by-product. By investigating various characteristics, it was observed that there is a consequential percentage decrease in Biological oxygen demand (55% -80%), Chemical oxygen demand (COD) (65% -80%), Chlorides (75% -90%) and Alkalinity (75% -85%).

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Artificial Intelligence for the Evaluation of Operational Parameters Influencing Nitrification and Nitrifiers in an Activated Sludge Process

et al. 2016

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Nitrification at a full-scale activated sludge plant treating municipal wastewater was monitored over a period of 237 days. A combination of fluorescent in situ hybridization (FISH) and quantitative real-time polymerase chain reaction (qPCR) were used for identifying and quantifying the dominant nitrifiers in the plant. Adaptive neuro-fuzzy inference system (ANFIS), Pearson's correlation coefficient, and quadratic models were employed in evaluating the plant operational conditions that influence the nitrification performance. The ammonia-oxidizing bacteria (AOB) abundance was within the range of 1.55 × 10(8)-1.65 × 10(10) copies L(-1), while Nitrobacter spp. and Nitrospira spp. were 9.32 × 10(9)-1.40 × 10(11) copies L(-1) and 2.39 × 10(9)-3.76 × 10(10) copies L(-1), respectively. Specific nitrification rate (qN) was significantly affected by temperature (r 0.726, p 0.002), hydraulic retention time (HRT) (r -0.651, p 0.009), and ammonia loading rate (ALR) (r 0.571, p 0.026). Additionally, AOB was considerably influenced by HRT (r -0.741, p 0.002) and temperature (r 0.517, p 0.048), while HRT negatively impacted Nitrospira spp. (r -0.627, p 0.012). A quadratic combination of HRT and food-to-microorganism (F/M) ratio also impacted qN (r (2) 0.50), AOB (r (2) 0.61), and Nitrospira spp. (r (2) 0.72), while Nitrobacter spp. was considerably influenced by a polynomial function of F/M ratio and temperature (r (2) 0.49). The study demonstrated that ANFIS could be used as a tool to describe the factors influencing nitrification process at full-scale wastewater treatment plants.

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Mechanism of efficient nutrient removal and microbial analysis of a combined anaerobic baffled reactor–membrane bioreactor process

Cited by 8 publications

References 33 publications

Simultaneous removal of nutrients in a novel anaerobic–anoxic/aerobic sequencing reactor: removal of nutrients in a novel reactor

Simultaneous removal of nutrients in a novel anaerobic–anoxic/aerobic sequencing reactor: removal of nutrients in a novel reactor

Analysis and Treatment of Reverse Osmosis (Ro) Reject From Dye Industries Using Anaerobic Baffled Reactor

Artificial Intelligence for the Evaluation of Operational Parameters Influencing Nitrification and Nitrifiers in an Activated Sludge Process

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