Inhibition of chemical dose in biological phosphorus and nitrogen removal in simultaneous chemical precipitation for phosphorus removal

Liu, Yanchen; Shi, Hanchang; Li, Wenlin; Hou, Yanling; He, Mengchang

doi:10.1016/j.biortech.2010.11.107

Cited by 78 publications

(20 citation statements)

References 22 publications

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“…Many research studies have been conducted on the influence of iron species on biological phosphorus removal, nitrification, and sludge characteristics in activated sludge systems since both ferric iron, Fe 3+ , and ferrous iron, Fe 2+ , are widely used for additional chemical phosphorus removal in these systems. Liu and Horn reported that the Fe concentration was found to be linearly correlated with

{NH}_{4}^{+}

–N removal during the deammonification process when the Fe 2+ concentration in the influent was below 1.3 mg L −1 .…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metals, such as tin, copper, silver, and chromium, are known for their inhibitory effect on the enhanced biological phosphorus removal (EBPR) process . The influence of iron salts Fe 3+ and Fe 2+ on biological phosphorus removal and nitrification in activated sludge systems was found to be weak, and these iron salts inhibited phosphorus removal only when the dose was large enough (>40 mg L −1 ) . Although the effect of iron salts on nitrification in pure and mixed culture has been investigated, detailed knowledge of its behaviour on the aerobic granulation process remains to be investigated.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the growth of Nitrosomonas europaea in pure culture was inhibited with 1,200 mM Fe, while an Fe concentration of 0.1 mM is generally considered an Fe-deficient condition; an Fe concentration below 1 mM is a low Fe condition, and 10 mM is a standard condition. 7 Many research studies have been conducted on the influence of iron species on biological phosphorus removal, nitrification, 8,9 and sludge characteristics 10 in activated sludge systems since both ferric iron, Fe 31 , and ferrous iron, Fe 21 , are widely used for additional chemical phosphorus removal in these systems. Liu and Horn 11 reported that the Fe concentration was found to be linearly correlated with NH 1 4 -N removal during the deammonification process when the Fe 21 concentration in the influent was below 1.3 mg L 21 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Yılmaz

Çetin

Bozkurt

et al. 2017

Biotechnology Progress

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Lab-scale experiments were conducted to investigate the effects of ferrous iron on nutrient removal performance and variations in the microbial community inside aerobic granular sludge for 408 days. Two reactors were simultaneously operated, one without added ferrous iron (SBR1), and one with 10 mg Fe L of added ferrous iron (SBR2). A total of 1 mg Fe L of added ferrous iron was applied to SBR1 starting from the 191st day to observe the resulting variations in the nutrient removal performance and the microbial community. The results show that ammonia-oxidizing bacteria (AOB) could not oxidize ammonia due to a lack of iron compounds, but they could survive in the aerobic granular sludge. Limited ferrous iron addition encouraged nitrification. Enhanced biological phosphorus removal (EBPR) from both reactors could not be maintained regardless of the amount of ferrous iron that was applied. EBPR was established in both reactors when the concentration of mixed liquor suspended solid (MLSS) and the percentage of Accumulibacteria increased. A total of 10 mg Fe L of added ferrous iron had a relatively adverse effect on the growth of AOB species compared to 1 mg Fe L of added ferrous iron, but it encouraged the growth of Nitrospira sp. and Accumulibacteria, which requires further study. It could be said that the compact and stable structure of aerobic granular sludge preserved AOB and NOB from Fe-deficient conditions, and wash-out during the disintegration period. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:716-725, 2017.

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{NH}_{4}^{+}

–N removal during the deammonification process when the Fe 2+ concentration in the influent was below 1.3 mg L −1 .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Yılmaz

Çetin

Bozkurt

et al. 2017

Biotechnology Progress

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show abstract

“…The pH values were stable during the anaerobic period and increased during the first hour of the aerobic period as the pH was not controlled during the cycle study [27,[61][62][63]; it then became stable up until the end of the aerobic period. The slight increase in pH at the beginning of an aerobic cycle was due to the release of CO 2 from mixed liquor.…”

Section: Overall Performance Of Reactors Fed With Butyratementioning

confidence: 91%

Impact of butyrate on microbial selection in enhanced biological phosphorus removal systems

Begum¹,

Batista²

2014

Environmental Technology

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Microbial selection in an enhanced biological phosphorus removal system was investigated in a laboratory-scale sequencing batch reactor fed exclusively with butyrate as a carbon source. As reported in the few previous studies, butyrate uptake was slow and phosphorus (P) release occurred during the entire anaerobic period. Polyphosphate-accumulating organism (PAO), i.e. Candidatus Accumulibacter phosphatis (named as Accumulibacter), glycogen-accumulating organisms (GAOs), i.e. Candidatus Competibacter phosphatis (named as Competibacter) and Defluviicoccus-related, tetrad-forming alphaproteobacteria (named as Defluviicoccus) were identified using fluorescence in situ hybridization analysis. The results show that Accumulibacter and Defluviicoccus were selected in the butyrate-fed reactor, whereas Competibacter was not selected. P removal was efficient at the beginning of the experiment with an increasing percentage relative abundance (% RA) of PAOs. The % RA of Accumulibacter and Defluviicoccus increased from 13% to 50% and 8% to 16%, respectively, and the % RA of Competibacter decreased from 8% to 2% during the experiment. After 6 weeks, P removal deteriorated with the poor correlation between the percentage of P removal and % RA of GAOs.

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“…The mechanism of chemical precipitation is that F -reacts with Ca 2+ to produce CaF 2 [7]: The main technologies of removing phosphate from wastewater consist of chemical precipitation [8], biological degradation [9], and adsorption [10]. The mechanism of chemical precipitation removing PO 4 3− involves PO 4 3− reacting with Ca 2+ to produce Ca 3 (Po 4 ) 2 [11]: 3Ca PO Ca (PO ) Similar as phosphate, the method to reduce the sulfate in wastewater includes chemical precipitation [12], biological treatment [13], and adsorption [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Removing F – , PO 4 3 − and SO 4 2 − from Wastewater in Aluminum Surface Treatment Solution

Pei¹,

Wei²,

Li³

2017

JRST

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This paper treats aluminum surface treatment solution wastewater and adopts coagulation-chemical precipitation method (combination of CaO, PAC and PAM) to remove F -, PO 4 3− and SO 4 2− . The study explores an approach that can remove F -, PO 4 3− and SO 4 2− in the wastewater simultaneously. Through optimization and improvement of reagent dosage and reaction conditions, the treated wastewater reaches the national discharge standards. The experimental results show that the optimal conditions for removal of F -, PO 4 3− and SO 4 2− are: 1150 mg of CaO, 110 mg of PAC, 85 mg of PAM at pH 9 and a reaction temperature of 323 K for a reaction time of 30 min. After treatment, the concentration of F -is 4.30 mg/L, which is lower than discharge standards of fluoride-containing industrial wastewater (10 mg/L). The concentration of PO 4 3− is 0.90 mg/L, lower than the second grade of discharge standard of phosphate-containing industrial wastewater (1.0 mg/L). The concentration of SO 4 2− is 125mg/L, lower than the maximum of allowable concentration of sulfate in drinking water standards (250 mg/L).

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Inhibition of chemical dose in biological phosphorus and nitrogen removal in simultaneous chemical precipitation for phosphorus removal

Cited by 78 publications

References 22 publications

Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal

Impact of butyrate on microbial selection in enhanced biological phosphorus removal systems

Experimental Study of Removing F – , PO 4 3 − and SO 4 2 − from Wastewater in Aluminum Surface Treatment Solution

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