Optimization of phosphorus removal from secondary effluent using simplex method in Tianjin, China

Wang, Yuqiu; Han, Tianwei; Xu, Ze; Bao, Guangqing; Zhu, Tong

doi:10.1016/j.jhazmat.2005.02.006

Cited by 47 publications

(15 citation statements)

References 23 publications

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“…However, it is never achieved in practice and the actual ratio between aluminum dosed and phosphorus removed is always higher than 2 (De Hass, et al, 2000). Although the presently observed ratio of 2.3 mole of aluminum per mole of phosphorus was higher than theoretical calculation, it was comparatively lower than the value of 4.13 and 3 reported by Wang, et al, (2005) and Xie, et al, (2005), respectively, for the secondary treated wastewater. Table 1 presents data on treatment efficiency of aluminum at 2.3:1 mole ratio dosages.…”

Section: Resultscontrasting

confidence: 79%

“…Actually, phosphorus removal techniques fall into three main categories: physical, chemical and biological (Wang, et al, 2006). Among them, chemical removal techniques, using metal salts, are reliable and well-established processes (Yeoman, et al, 1988;Wang, et al, 2005 andLee, et al, 2003). Chemically, phosphate is most commonly removed by precipitation.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus removal in low alkalinity secondary effluent using alum

Banu

Yeom

2007

Int. J. Environ. Sci. Technol.

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ABSTRACT:The alkalinity plays an important role in phosphorus removal using coagulant. The dosage of coagulant in the low alkalinity wastewater is limited due to rapid pH changes. In the present study, a series of jar test was conducted using low alkalinity wastewater (50 mg/L) to evaluate the optimum pH, dosage and performance parameters (slow mixing and settling time) for the common coagulant alum. From the experiment, it was found that the dosage of coagulant and removal of phosphorus depend upon the pH of the wastewater after adding coagulant. The final optimum pH for efficient P removal was found to be within the range of 5.7-5.9. This range acts as an indicator and it is the maximum tolerable pH range for phosphorus removal for low alkalinity wastewater. The optimum time for slow mix and settling was found to be 20 min. The optimum mole ratio of alum to remove one mole of phosphorous was found to be 2.3. The alum coagulation at pH 7 produced effluent with the total residual phosphorus and reactive phosphorus content of 0.3 and 0.9 mg/L, respectively.

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Section: Resultscontrasting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Phosphorus removal in low alkalinity secondary effluent using alum

Banu

Yeom

2007

Int. J. Environ. Sci. Technol.

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“…In the present study, a mol ratio of 2.2 of aluminum per 1 mol of phosphorus was used to bring down the effluent TP level in the range of 0.5~1.0 mg/L. It was higher than theoretical calculation but it was comparatively lower than the value of 4.13 and 3 reported by Wang et al [14] and Xie et al [15], respectively for the secondary treated wastewater. Nitrification rates based on ammonium consumed were calculated using the following equation [16]:…”

Section: Resultsmentioning

confidence: 56%

Effect of alum on nitrification during simultaneous phosphorous removal in anoxic/oxic reactor

Banu

Kaliappan

et al. 2009

Biotechnol Bioproc E

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^Äëíê~Åí= Phosphorus and nitrogen are the important eutrophication nutrients. They are removed in the anoxic/oxic reactor through simultaneous precipitation and biological nitrogen removal. The effect of alum a commonly used simultaneous precipitant on biological nitrification and denitrification are investigated in the present study. Simultaneous removal of phosphorus was carried out using the coagulant alum Al 2 (SO 4 ) 3 ·14H 2 O at 2.2 mol ratio. Before the start of simultaneous precipitation the nitrification rate of the A/O reactor was found to be 0.05 g N-NH 4 + /g VSS/d. It starts to decrease with increase in coagulant dosage. The nitrification rate for alum dosage 97.13 mg/L was 0.38 g N-NH 4 +

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“…Iron saturated residual dosages were held constant through the beginning of each spike addition until the phosphorus concentration of the clarified water de creased and stabilized. Residual dosages were then slight ly adjusted to bring the clarified wastewater phosphorus concentration back into the target range following optimization (Wang et al, 2005. This test illustrates the overall stability of the wastewater treatment method in handling increases in the initial wastewater phosphorus concentration.…”

Section: Resultsmentioning

confidence: 99%

Improvement of phosphorus removal in the wastewater treatment

Valentukevičienė¹,

Ignatavičius²

2015

ekologija

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This research study is dedicated to sustainable use of backwash residual from groundwater treatment plants. A high concentration of phosphorus ranging from more than 12 mg/l was detected after primary sedimentation of domestic wastewater and cannot be removed with the existing biological reactors at wastewater treatment plants (Vilnius, Lithuania). Previous research results showed that the high levels of nitrogen compounds are also connected with phosphorus sub stances. A new reused material is presented in this article for the removal of phosphorus substances from wastewater by use of iron saturated backwash solids obtained from groundwater treatment plants. The treated wastewater quality increased during the treatment that used the 1 g/l dosage of backwash residual from groundwater treatment filters: phosphorus compounds concentration decreased by 98%. All results obtained from this research can be used with the background of sustainable development approach, when backwash residuals from gravitational filters can be collected and used for the removal of phosphorus compounds from domestic wastewater.

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Optimization of phosphorus removal from secondary effluent using simplex method in Tianjin, China

Cited by 47 publications

References 23 publications

Phosphorus removal in low alkalinity secondary effluent using alum

Phosphorus removal in low alkalinity secondary effluent using alum

Effect of alum on nitrification during simultaneous phosphorous removal in anoxic/oxic reactor

Improvement of phosphorus removal in the wastewater treatment

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