Phosphorus release during alkaline treatment of waste activated sludge from wastewater treatment plants with Al salt enhanced phosphorus removal: Speciation and mechanism clarification

2019 ◽  
Vol 688 ◽  
pp. 87-93 ◽  
Author(s):  
Amna Bashir ◽  
Lingyue Wang ◽  
Shaoyu Deng ◽  
Jiaqi Liu ◽  
Jingbao Tian ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Alkaline Treatment ◽  
Phosphorus Release ◽  
Waste Activated Sludge

scholarly journals Transformation and release of phosphorus from waste activated sludge upon combined acid/alkaline treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (56) ◽  
pp. 35340-35345 ◽  
Author(s):  
Zhang-Wei He ◽  
Cong-Cong Tang ◽  
Ling Wang ◽  
Ze-Chong Guo ◽  
Ai-Juan Zhou ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Total Phosphorus ◽  
Alkaline Treatment ◽  
Phosphorus Release ◽  
Waste Activated Sludge

Acid-alkaline treatment increased phosphorus release from waste activated sludge, and the potentially recoverable phosphorus accounted for 54.7% of the total phosphorus.

scholarly journals Long-term investigation of phosphorus removal by iron electrocoagulation in small-scale wastewater treatment plants

2018 ◽  
Vol 78 (6) ◽  
pp. 1304-1311 ◽  
Author(s):  
I. Mishima ◽  
M. Hama ◽  
Y. Tabata ◽  
J. Nakajima
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Phosphorus Release ◽  
Small Scale ◽  
Operational Conditions ◽  
Long Time ◽  
Negative Effect ◽  
Iron Electrolysis

Abstract Small-scale wastewater treatment plants (SWTPs), called Johkasou, are widely used as decentralized and individual wastewater treatment systems in sparsely populated areas in Japan. Even in SWTPs, nutrients should be removed to control eutrophication. An iron electrolysis method is effective to remove phosphorus chemically in SWTPs. However, it is necessary to determine the precise conditions under which phosphorus can be effectively and stably removed in full scale SWTPs for a long period. Therefore, long-term phosphorus removal from SWTPs was investigated and optimum operational conditions for phosphorus removal by iron electrolysis were analyzed in this study. Efficient phosphorus removal can be achieved for a long time by adjusting the amount of iron against the actual population equivalent. The change of the recirculation ratio had no negative effect on overall phosphorus removal. Phosphorus release to the bulk phase was prevented by the accumulated iron, which was supplied by iron electrolysis, resulting in stable phosphorus removal. The effect of environmental load reduction due to phosphorus removal by iron electrolysis was greater than the cost of power consumption for iron electrolysis.

Modelling of full-scale wastewater treatment plants with different treatment processes using the Activated Sludge Model no. 3

2001 ◽  
Vol 44 (1) ◽  
pp. 49-56 ◽  
Author(s):  
M. Wichern ◽  
F. Obenaus ◽  
P. Wulf ◽  
K.-H. Rosenwinkel
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Biological Phosphorus Removal ◽  
Activated Sludge Model ◽  
Treatment Processes ◽  
Biological Phosphorus ◽  
P Removal

In 1999 the Activated Sludge Model no. 3 (ASM 3) by the IWA task Group on Mathematical Modeling for Design and Operation of Biological Wastewater Treatment was presented. The model is used for simulation of nitrogen removal. On the basis of a new calibration of the ASM 3 with the easy degradable COD measured by respiration simulation runs of this paper have been done. In 2000 a biological phosphorus removal module by the EAWAG was added to the calibrated version of ASM 3 and is now serving the current requirements for modelling the enhanced biological P-removal. Only little experiences with different load situations of large-scale wastewater treatment plants were made with both new models so far. This article reports the experiences with the simulation and calibration of the biological parameters using ASM 3 and the EAWAG BioP Module. Three different large-scale wastewater treatment plants in Germany with different treatment systems will be discussed (Koblenz: pre-denitrification; Hildesheim: simultaneous denitrification with EBPR; Duderstadt: intermediate denitrification with EBPR). Informations regarding the choice of kinetic and stoichiometric parameters will be given.

Anaerobic co-digestion of sludge with other organic wastes and phosphorus reclamation in wastewater treatment plants for biological nutrients removal

2006 ◽  
Vol 53 (12) ◽  
pp. 177-186 ◽  
Author(s):  
D. Bolzonella ◽  
P. Pavan ◽  
P. Battistoni ◽  
F. Cecchi
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Organic Wastes ◽  
Organic Loading Rate ◽  
Waste Activated Sludge ◽  
Nutrients Removal ◽  
Nitrogen And Phosphorus ◽  
Biological Nutrients Removal

This paper deals with the performances obtained in full scale anaerobic digesters co-digesting waste activated sludge from biological nutrients removal wastewater treatment plants, together with different types of organic wastes (solid and liquid). Results showed that the biogas production can be increased from 4,000 to some 18,000 m3 per month when treating some 3–5 tons per day of organic municipal solid waste together with waste activated sludge. On the other hand, the specific biogas production was improved, passing from 0.3 to 0.5 m3 per kgVS fed the reactor, when treating liquid effluents from cheese factories. The addition of the co-substrates gave minimal increases in the organic loading rate while the hydraulic retention time remained constant. Further, the potentiality of the struvite crystallisation process for treating anaerobic supernatant rich in nitrogen and phosphorus was studied: 80% removal of phosphorus was observed in all the tested conditions. In conclusion, a possible layout is proposed for designing or up-grading wastewater treatment plants for biological nutrients removal process.

scholarly journals Quick start-up of Mudanjiang wastewater treatment plant and factors influencing phosphorous removal

2013 ◽  
Vol 8 (1) ◽  
pp. 1-8
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Phosphorus Removal ◽  
Treatment Plant ◽  
Phosphorus Release ◽  
Aeration Tank ◽  
Phosphorous Removal ◽  
Start Up ◽  
The One

Successful start-up of a full-scale wastewater treatment plant (WWTP) is a key issue for the succeeding operation of WWTP on the one hand and the nutritious phosphorus removal is of great concern on the other. After the construction of Mudanjiang WWTP with a flow rate of 100,000 m3 d-1 in Heilongjiang Province of China, a novel way of start-up through feeding wastewater continuously into the system was attempted against the conventional start-up method of inoculating activated sludge in the aeration tank by feeding wastewater intermittently. Activated sludge was cultivated and proliferated in the aeration tanks instead of dosing acclimated sludge from other source. After one-month’s start-up operation, MLSS, SV and SVI increased to 2.5 kg m-3, 30% and nearly 80% respectively, which indicated that quick and simple start-up had been achieved. After successful start-up, an investigation into phosphorus removal was conducted with the emphasis on influencing factors such as ORP and NOx-N concentration etc. When the aeration tank was switched from aerobic to anaerobic mode, phosphorus removal efficiency of 80% could be realized within the whole treatment system. Experimental results revealed that an ORP of -140 mV and NOX-N of 2 mg l-1 were critical for the anaerobic phosphorus release, and DO in the range of 1.7-2.5 mg l-1, BOD5/TP of 20-30 and SVI of 70~80 as well as SRT of 5 days were the optimal phosphorus removal conditions for the aeration tanks.

scholarly journals SARS-CoV-2 Detection in Istanbul Wastewater Treatment Plant Sludges

2020 ◽  
Author(s):  
Bilge Alpaslan Kocamemi ◽  
Halil Kurt ◽  
Ahmet Sait ◽  
Fahriye Sarac ◽  
Ahmet Mete Saatci ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Waste Activated Sludge ◽  
Secondary Process ◽  
Virus Concentration ◽  
Municipal Wastewater Treatment ◽  
Primary Sludge

Following the announcement of SARS-CoV-2 worldwide pandemic spread by WHO on March 11, 2020, wastewater based epidemiology received great attention in several countries: The Netherlands [Medama et al., 2020; K-Lodder et al., 2020], USA [Wu et al., 2020; Memudryi et al., 2020], Australia [Ahmed et al., 2020], France [Wurtzer et al., 2020], China [Wang et al., 2020], Spain [Randazzo et al., 2020; Walter et al., 2020], Italy (La Rosa et al., 2020; Rimoldi et al., 2020) and Israel [Or et al., 2020], performed analysis in wastewaters by using different virus concentration techniques. Turkey took its place among these countries on 7th of May, 2020 by reporting SARS-CoV-2 RT-qPCR levels at the inlet of seven (7) major municipal wastewater treatment plants (WWTPs) of Istanbul [Alpaslan Kocamemi et al., 2020], which is a metropole with 15.5 million inhabitants and a very high population density (2987 persons/km2) and having about 65 % of Covid-19 cases in Turkey. Sludges that are produced in WWTPs should be expected to contain SARS-CoV-2 virus as well. There has not yet been any study for the fate of SAR-CoV-2 in sludges generated from WWTPs. Knowledge about the existing of SARS-CoV-2 in sludge may be useful for handling the sludge during its dewatering, stabilizing and disposal processes. This information will also be valuable in case of sludges that are used as soil conditioners in agriculture or sent to landfill disposal. In wastewater treatment plants, generally two different types of sludges are generated; primary sludge (PS) and waste activated sludge (WAS). PS forms during the settling of wastewater by gravity in the primary settling tanks. Little decomposition occurs during primary sludge formation. Since most of the inorganic part of the wastewater is removed in the earlier grit removal process, the PS consists of mainly organic material that settles. The PS is about 1-2 % solids by weight. In the biological treatment part of the WWTPs, the biomass that forms in the anaerobic, anoxic and oxic zones of the process is settled in final clarifiers by gravity and returned to the beginning of the biological process so that it is not washed off. The waste activated sludge (WAS) is the excess part of the biomass that grows in this secondary treatment process. It has to be removed from the process not to increase the mixed liquor suspended solids concentration (bacteria concentration) in the secondary process more than a fixed value. The WAS is about 0.6 - 0.9 % solids by weight. This work aims to find whether SARS-CoV-19 is present in the PS and WAS before it is dewatered and sent to anaerobic or aerobic digester processes or to thermal drying operations. For this purpose, on the 7th of May 2020, two (2) PS samples were collected from Ambarlı and Tuzla WWTPs, seven (7) WAS samples were collected from Terkos, Ambarlı, Atakoy I & II, Pasakoy II, Buyukcekmece and Tuzla I WWTPs. Polyethylene glycol 8000 (PEG 8000) adsorption [Wu et al., 2020] SARS-Cov-2 concentration method was used for SARS-CoV-2 concentration after optimization. [Alpaslan Kocamemi et al., 2020]. Real time RT-PCR diagnostic panel validated by US was used to quantify SARS-CoV-2 RNA in primary and waste activated sludge samples taken from WWTPs in Istanbul. All samples were tested positive. Titers of SARS-CoV-2 have been detected ranging copies between 1.17E4 to 4.02x104 per liter.

Evaluation of the Feasibility of Implementing Biological Phosphorus Removal in Wastewater Treatment Plants

1991 ◽  
Vol 26 (4) ◽  
pp. 475-494
Author(s):  
Lise Raymond ◽  
Yves Comeau ◽  
Jean F. Riel ◽  
François G. Brière
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Air Entrainment ◽  
Advanced Technology ◽  
Rating System ◽  
Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Biological Phosphorus

Abstract A weighted rating system to evaluate the feasibility of implementing biological phosphorus removal to wastewater treatment plants was developed and applied to identify the most promising existing Quebec plants using activated sludge that may benefit from this advanced technology. Three main categories of criteria were considered, (A) phosphorus discharge standards, (B) influent and effluent characteristics and (C) process characteristics. The percentage of the total weight attributed to each category was 12%, 29% and 59%, respectively. The most important factors were proposed to be the plant flexibility and configuration, the influent BOD5/TP and TKN/COD ratios, the existence of a primary clarifier, the requirements to comply with phosphorus standards, the presence of a sand filter and the possibility of mixing without air entrainment the zones of the process that should not be aerated. Among the 16 activated sludge plants for which operating data was available for 1989, 9 showed an interesting potential for conversion to biological phosphorus removal (6 with aeration tanks, 1 with oxidation ditches and 2 with sequencing batch reactors). Operation and construction modifications were proposed to convert these 9 plants to biological phosphorus removal and the rating system was used to assess the beneficial effect of the proposed modifications. A preliminary cost estimate performed on 7 of these plants indicated that conversion costs to biological phosphorus removal were either negligible (4 or 5 plants) or comparable to the present value of the cost of chemicals over a 20-year period (2 plants). With these conversions, biological phosphorus removal could replace partially or completely chemical phosphorus precipitation, depending on the phosphorus standards, wastewater and plant characteristics.

Efficiency of the Activated Sludge Model no. 3 for German wastewater on six different WWTPs

2003 ◽  
Vol 47 (11) ◽  
pp. 211-218 ◽  
Author(s):  
M. Wichern ◽  
M. Lübken ◽  
R. Blömer ◽  
K.-H. Rosenwinkel
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Large Scale ◽  
Wastewater Treatment Plants ◽  
Biological Parameters ◽  
Biological Phosphorus Removal ◽  
Activated Sludge Model ◽  
Biological Phosphorus ◽  
Activated Sludge Systems

In 1999, the Activated Sludge Model No. 3 by the IWA Task Group on Mathematical Modelling for the Design and Operation of Biological Wastewater Treatment was presented. The model is used for the simulation of nitrogen removal. The simulations in this paper were done on the basis of a new calibration of the ASM 3 by Koch et al., with the easily degradable COD measured by respiration. For modelling of EBPR the BioP-Module of Rieger et al., was used. Six German wastewater treatment plants were simulated during this research to test the existing set of parameters of the models on various large scale plants. It was shown that changes for nitrification and enhanced biological phosphorus removal in the set of biological parameters were necessary. Sensible parameters and recommended values are presented in this article. Apart from the values of the changed biological parameters, we will in our examination discuss the modelling of the different activated sludge systems and the influent fractioning of the COD. Two plants with simultaneous denitrification in the recirculation ditch (EBPR) are simulated, one with preliminary dentrification, one with intermittent denitrification (EBPR), one with cascade denitrification (EBPR), and one pilot plant according to the Johannesburg-process (EBPR) which was simulated over a period of three months.

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