Temperature effect on microbial community of enhanced biological phosphorus removal system

Panswad, Thongchai; Doungchai, Apiradee; Anotai, Jin

doi:10.1016/s0043-1354(02)00286-5

Cited by 175 publications

(100 citation statements)

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“…Previous studies have reported that the uptake or removal of P in the presence of periphyton depends on numerous factors such as light, temperature, water column P concentration, and water flow velocity (Matheson et al, 2012;Panswad et al, 2003). It was obvious that light intensity, temperature and initial P concentration have a significant effect on the P removal rate in the presence of periphyton (P b 0.05, Fig.…”

Section: Effect Of Environmental Factorsmentioning

confidence: 93%

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Feng

et al. 2016

Science of The Total Environment

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• Phototrophic periphyton is effective in removing P (P o and P i ) from wastewaters.• Adsorption with physiochemical characteristic dominated P removal mechanism by periphyton.• The P within periphyton is mainly in forms of Labile-P and Ca-P.• The periphyton has vast potential application in recovering P for salt-soil zone The P (P i as KH 2 PO 4 and P o as ATP) removal processes by phototrophic periphyton were investigated by determining the removal kinetics, metal content (Ca, Mg, Al, Fe, Cu, and Zn) of the solution and P fractions (Labile-P, Fe/Al-P, Ca-P, and Res-P) within the periphyton. Results showed that the periphyton was able to remove completely both P i and P o after 48 h when periphyton content was greater than 0.2 g L −1 (dry weight). The difference between P i and P o removal was the conversion of P o into P i by the periphyton, after that the removal mechanism was similar. The P removal mechanism was mainly due to the adsorption on the surfaces of the periphyton, including two aspects: i) the adsorption of PO 4 3− onto metal salts such as calcium carbonate (~50%) and ii) complexation between PO 4 3− and metal cations such as Ca 2+ (~40%). However, this bio-adsorptional process was significantly influenced by the extracellular polymeric substance (EPS) of periphyton, water hardness, initial G R A P H I C A L A B S T R A C T a b s t r a c t a r t i c l e i n f oKeywords:Science of the Total Environment 568 (2016) 838-844Abbreviations: α, the initial adsorption rate (mg g −1 h −1 ); β, the desorption constant (g mg −1 ); m, mass of adsorbent (g); t, time (h); C, the constant of boundary layer effect; H, Shannon index; R, ideal gas constant (8.314 J mol −1 K −1 ); T, temperature (K); V, the volume of solutions (L); k 1 , pseudo-first-order kinetic model rate constant (h −1 ); k 2 , pseudosecond-order kinetic model rate constant (mg g −1 h −1 ); q e , the amount of P adsorbed onto the periphyton at equilibrium (mg g −1 ); q e,cal , the amount of P adsorbed onto the periphyton calculated by model at equilibrium (mg g −1 ); q m , the maximum adsorption capacity for the periphyton (mg g −1 ); q t , the amount of P adsorbed onto the periphyton at time t (mg g −1 ); C 0 , initial P concentration (mg L −1 ); K id , intraparticle rate constant (mg g −1 h -0.5 ); P i , inorganic phosphorus (mg L −1 ); P o , organic phosphorus (mg L −1 ); TP, the total phosphorus content (mg L −1 ); R 2 , linear regression coefficient; ANSW, artificial non-point source wastewater; ATP, disodium adenosine triphosphate (C 10 H 14 O 13 N 5 P 3 Na 2 ·3H 2 O); DW, dry weight of the periphyton (g); EPS, extracellular polymeric substance of the periphyton; PDW, pure distilled water.⁎ Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v P concentration, temperature and light intensity. This study not only deepens the understanding of P biogeochemical process in aquatic ecosystem, but provides a potential biomaterial...

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Section: Effect Of Environmental Factorsmentioning

confidence: 93%

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Feng

et al. 2016

Science of The Total Environment

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“…The composition of the synthetic wastewater is shown in Table 1. Table 2 describes the microbial populations in each SBR as determined algebraically by Panswad et al 12 using stoichiometric and kinetic data as well as the mass balance equation, with the assumption that substrate uptake in anaerobic stage was due to the PAOs (coupled with phosphorus release) and the GAOs (no phosphorus release), whereas in aerobic stage was solely by ordinary heterotrophs (OHOs). After the steady state had been reached, each vessel was subjected to thermal stress by either pulse-or stepalteration schemes as shown in Figure 2.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, there is a strong need to evaluate the impact of temperature variation on the EBPR process. Many studies on the effects of temperature on the efficiency of the EBPR process have been conducted; [11][12][13][14][15][16][17] however, the results are inconsistent, possibly due to differences in thermal-stress scenario. This study concentrates on the impact of temperature shock, which is likely to happen in field practice, on EBPR performance.…”

Section: Scienceasia Scienceasia Scienceasiamentioning

confidence: 99%

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Panswad¹,

Doungchai²,

Anotai³

2003

ScienceAsia

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An enhanced biological phosphorus removal (EBPR) process is currently one of the most economical and practical ways to reduce high phosphorus content in wastewaters. Under sequential conditions of anaerobic and aerobic environments, the phosphateaccumulating organisms (PAOs), which are able to accumulate intracellular phosphorus in a much higher quantity than other microorganisms, become predominant. In anaerobic stage, the PAOs absorb readily biodegradable substrate by destroying their storage polyphosphate to form adenosine triphosphate (ATP) and adenosine diphosphate (ADP), sequentially, and releasing free phosphate to the bulk solution. The substrate taken up is metabolized in the following aerobic stage to produce energy some of which replenishes the polyphosphate storage pool by absorbing phosphate from the bulk solution. The amount taken up aerobically is more than that released anaerobically; hence the phosphorus in the liquid phase is reduced. Although many researchers have recently attempted to investigate the ecology and microbiology of the EBPR processes using either culture-dependent or -independent approaches, the results are still inconclusive.1 In parallel to microbiologial approach, several investigators have tried to solve this problem through biochemical models which are developed based on mechanistic considerations of the mixed cultures in activated sludge under control conditions. These models, e.g., Comeau model, 2 Mino model, 3 metabolic model, [4][5][6] and enhanced culture kinetic model, 7-9 involve stoichiometry and process kinetic rate equations. Many EBPR systems have been designed and constructed by using the simplified versions of these models. Although most of them perform reliably as expected, some behave unpredictably. One possible explanation of most interest to the researchers is that, under certain operating conditions, other microorganisms are more selectively favored than the PAOs, hence diminishing the EBPR performance. The microbial group believed to be a major competitor of the PAOs are the glycogenaccumulating organisms (GAOs), which also assimilate substrates under anaerobic conditions. 10 As named, this microbial group aerobically synthesizes and stores glycogen as its primary energy source. Since polyphosphate is not involved in substrate assimilation, ABSTRACT: Four anaerobic-aerobic sequencing batch reactors with 9-day of sludge age were operated under a 12-hour cycle of 5, 290, 360, 60, and 5 minutes for the filling, anaerobic, aerobic, settling, and withdrawal periods, respectively. The results indicated that increasing temperature from the phosphate-accumulating organisms (PAOs) preferred temperature of 20°C by either pulse (5°C after every 5 days) or step (1°C per day) manner had negative impacts on the PAOs' activities, particularly on the aerobic phosphorus uptake. However, the pulse-increase scenario, especially from 30 to 35°C, caused more severe impacts than the stepincrease scenario. On the contrary, the shock in a decreasing manner regardless of experimen...

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“…Sudden change of temperature was also one of the reasons for the reduction of phosphorus removal activities. As the temperature rises, the portion of energy required for activity maintenance of PAOs increases substantially which reduces the energy availability for cell reproduction (Panswad et al 2003). Erdal et al (2003) proposed that better performance of the system was due to a reduced competition for substrate in the non-oxic zones, which resulted in an increased PAO population as temperature decreased that coincided with better performance of EBPR at lower temperatures.…”

Section: Temperature Variation and The Counteractionmentioning

confidence: 99%

Simultaneous denitrification and denitrifying phosphorus removal in a full-scale anoxic–oxic process without internal recycle treating low strength wastewater

Wang

Chen

2016

Journal of Environmental Sciences

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Performance of a full-scale anoxic-oxic activated sludge treatment plant (4.0 × 10 5 m 3 /day for the first-stage project) was followed during a year. The plant performed well for the removal of carbon, nitrogen and phosphorus in the process of treating domestic wastewater within a temperature range of 10.8°C to 30.5°C. Mass balance calculations indicated that COD utilization mainly occurred in the anoxic phase, accounting for 88.2% of total COD removal. Ammonia nitrogen removal occurred 13.71% in the anoxic zones and 78.77% in the aerobic zones. The contribution of anoxic zones to total nitrogen (TN) removal was 57.41%.Results indicated that nitrogen elimination in the oxic tanks was mainly contributed by simultaneous nitrification and denitrification (SND). The reduction of phosphorus mainly took place in the oxic zones, 61.46% of the total removal. Denitrifying phosphorus removal was achieved biologically by 11.29%. Practical experience proved that adaptability to gradually changing temperature of the microbial populations was important to maintain the plant overall stability. Sudden changes in temperature did not cause paralysis of the system just lower removal efficiency, which could be explained by functional redundancy of microorganisms that may compensate the adverse effects of temperature changes to a certain degree. Anoxic-oxic process without internal recycling has great potential to treat low strength wastewater (i.e., TN < 35 mg/L) as well as reducing operation costs.

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Temperature effect on microbial community of enhanced biological phosphorus removal system

Cited by 175 publications

References 15 publications

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

Phototrophic periphyton techniques combine phosphorous removal and recovery for sustainable salt-soil zone

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Simultaneous denitrification and denitrifying phosphorus removal in a full-scale anoxic–oxic process without internal recycle treating low strength wastewater

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