The modified renphosystem: a high biological nutrient removal system

Rensink, J. H.; Ven, Jeanine van der; Pamelen, G. van; Fedder, F.; Majoor, E.

doi:10.2166/wst.1997.0376

Cited by 10 publications

(6 citation statements)

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“…The phenomena called secondary phosphate release, is detrimental to the biological nutrient removal process. This was discovered by several literatures [23], [24]. Therefore, avoiding the secondary P-release is important for the process.…”

Section: B Effect Of Nitrate On Anoxic Phosphorus Uptakementioning

confidence: 91%

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Xu¹

2015

IJESD

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Abstract-Denitrifying phosphorus removal technology has advantage on beneficial for reduction of COD consumption, and the anoxic phosphorus uptake process is the key process. This study was to investigate the effect of the phosphorus release and initial nitrate concentration, which are two important infectors, on the anoxic phosphorus uptake process, by batch two Tests. The results show that the improvement of Prelease/MLSS would increase the amount of nitrogen and phosphorus removal as well as the specific phosphorus uptake rate(PUR),and the relationship between the amount of P release per MLSS was found in this paper. Nitrate would have little impact on the phosphorus uptake rate in anoxic condition if nitrate was adequate as the electron acceptor. Besides, a function formula was fitted to predict the amount of electron acceptor by the amount of P release per MLSS. I. INTRODUCTIONOver the last decades, the discovery of denitrification phosphate accumulating organisms (DPAO) has been extensively reported, These organisms, as conventional poly-P bacteria, could sequester organic substrates under anaerobic condition, Instead, they utilize nitrate or nitrite as electron acceptor to accumulate phosphate [1]- [7]. Moreover, it is widely recognized that both of denitrification and phosphorus release require organism substrates as electron donor, which is a bottle-neck in resent wastewater treatment plants, especially in China with low COD/N ratio. Thus applying DPAOs in the plants has integrated nitrogen and phosphorus removal for COD is utilized simultaneously, which is beneficial for reduction of COD consumption [8], lower aeration requirement [9], and less sludge production [10]. Although many literatures reported the variety of factors that affected anaerobic phosphorus release and organism uptake, such as MLSS , SRT [11], COD/N,COD/P [12], there are few implies that all the factors would have indirectly or directly impact on the P removal efficiency through P release. No matter what had influenced the anaerobic P release, the amount of phosphorus release could be expressed all the factors affecting P removal. Furthermore, the investigation of the amount of P release should eliminate the influence of MLSS on operation of the experiment, which promoted the concept of the amount of P release per MLSS (Prelease/MLSS). Hence in this study we focused on the investigation of the effect of Prelease/MLSS on the phosphate and nitrogen removal, which will benefit for further innovative processes investigation. Furthermore, the validation of the positive role of nitrate in phosphorus uptake under anoxic condition has been highlighted in literatures [13]- [15]. Conclusion that adequate amount of nitrate would ensure the phosphorus uptake performance had been verified [16]. However, it is necessary to investigate the relation of P-uptake rate and the concentration of nitrate. Most importantly, nitrate should be controlled in a range of value to validate its sufficient requirement as electron acceptor under anoxic condition in...

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Section: B Effect Of Nitrate On Anoxic Phosphorus Uptakementioning

confidence: 91%

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Xu¹

2015

IJESD

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“…The supernatant of the stripper tank is generally sent through a Crystalactor â (see 3.6) (Rensink et al, 1997). In the stripper tank a detention time of 4 hours was sufficient.…”

Section: The Bcfs â Processmentioning

confidence: 99%

“…In the stripper tank a detention time of 4 hours was sufficient. Dosage of acetate (10-20 mg COD/g MLSS) stimulate phosphorus release and growth of PAOs (Rensink et al, 1997). The efficiency of the P-removal on the basis of ortho-phosphate and total phosphate amounted 97 and 87% respectively (Rensink et al, 1997).…”

Section: The Bcfs â Processmentioning

confidence: 99%

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Enhanced biological phosphorus removal

Baetens¹

2020

Biological Wastewater Treatment: Principles, Modeling and Design

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PolyHydroxyAlkanoates (PHA) and Poly-β-HydroxyButyrate (PHB) in particular has become a compound which is routinely investigated in wastewater research. The PHB analysis method is only recently applied to activated sludge samples where PHA contents might be relatively low. This urges the need to investigate the reproducibility of the gas chromatographic method for PHB analysis. This was evaluated in a Round-Robin test in 5 European laboratories with samples from lab-scale and full-scale enhanced biological phosphorus removal systems. The basic method was direct solvent extraction of lyophilised cells, depolymerisation (hydrolysis) of the polymer and alkylation of the alkanoates. All steps take place in one tube with the necessary incubation time generally being 2 hours. The concentration of the (propyl)ester is then analysed by gas chromatography. Each lab used slightly modified methods. It was observed that the use of an internal standard improved the reproducibility of the method, that using dichloro(m)ethane as solvent instead of chloroform improves the GC analysis and that shaking the reaction tubes during heating improves the esterification reaction. It was shown that the standard deviation of measurements in each lab and the reproducibility between the labs was very good. Experimental results obtained by different laboratories using this analysis method can be compared. Sludge samples with PHB contents varying between 0.3 and 22.5 mg PHB/mg sludge were analysed. The gas chromatographic method allows for PHV, PH2MB and PH2MV analysis as well. The gas chromatographic analysis of PHA is important for kinetic modelling of EBPR processes. Moreover, with the publication of the Activated Sludge Model No3 and the general acceptance that storage polymers are of prime importance for non polyphosphate accumulating organisms as well, analysis of internal storage components becomes a prerequisite for modelling the activated sludge processes.

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“…According to other studies, nitrate of 1-1.5 mg•L −1 could inhibit secondary phosphorus release effectively because nitrate could be used as electron acceptor for PHA or glycogen oxidation, which could restrain secondary phosphorus release and supply the energy demanded for the endogenous process [19][20][21]. Since controlling the ORP in the pre-anoxic zone at 13 mV at different influent organic and nutrient loading rates was exceedingly difficult, the RAS pre-concentration ratio was controlled by keeping ORP between 21 and 13 mV in the pre-anoxic zone.…”

Section: Control Strategy For Anoxic Phosphorus Removal In the Pre-anmentioning

confidence: 99%

Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

Liu

Yang

et al. 2012

Chinese Journal of Chemical Engineering

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A pilot-scale, pre-anoxic-anaerobic oxidation ditch was used in this study to treat municipal wastewater with limited carbon source. A novel return activated sludge (RAS) pre-concentration tank was adopted for improving the phosphorus removal efficiency and the effects of RAS pre-concentration ratio were studied. Under the optimal operational condition, the suspended total phosphorus (STP) and the total phosphorus (TP) removal efficiencies were around 58.9% and 63.9% respectively and the effluent 3 4 PO −-P was lower than 0.8 mg•L −1. The reason is that with the optimal RAS pre-concentration ratio, nitrate is completely removed with endogenous carbon source and the secondary phosphorus release is strictly restrained in the pre-anoxic tank. Therefore, the anaerobic phosphorus release and the carbon source uptake by phosphorus accumulation organisms (PAOs) in the sludge, which are extremely important to the phosphorus removal process, can be fully satisfied. Furthermore, the oxidation-reduction potential is proved to be suitable for controlling the RAS pre-concentration ratio due to influent fluctuation and varied conditions. The novel modified system is also beneficial for PAO accumulation.

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The modified renphosystem: a high biological nutrient removal system

Cited by 10 publications

References 0 publications

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Influence of Phosphorus Release and Initial Nitrate Concentration on Anoxic Phosphorus Uptake

Enhanced biological phosphorus removal

Effect of Return Sludge Pre-concentration on Biological Phosphorus Removal in a Novel Oxidation Ditch

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