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Efficient control of coagulant dosing in wastewater treatment

100%

Ratnaweera H., Smoczynski L., Lewandowski A., Bielecka M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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2005

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tom 505

Coagulant dosing control (CDC) is necessary to ensure stable treated water quality and to reduce chemical costs both in drinking and wastewater treatment plants. The rapid development in online sensors and equipment as well as control strategies has triggered a significant development in CDC. Software sensors, streaming current detectors, charge titration units, potential dispersion analyzers etc. are now successfully used. Despite the significant advancement in the introduction and use of these novel techniques, most plants still relay on simple CDC techniques like flow proportional dosing, leaving great opportunities to reduce the coagulant costs, sludge treatment costs while achieving better treatment efficiencies overall. The paper presents a novel concept to optimize coagulant dosing control in wastewater treatment plants, and an intention to develop a widely available solution using a Polish-Norwegian Research & Development venture.

2

Biodegradation of used metalworking fluids in wastewater treatment

100%

Muszynski A., Lebkowska M.

Polish Journal of Environmental Studies

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2005

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tom 14

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nr 1

A biotechnological method for metalworking fluids (MWF) wastewater treatment was developed. The research, conducted in a lab-scale bioreactor, proved that the process of eliminating pollutants from MWF wastewater proceeds effectively when the following are applied: multiple reinoculating of biomass by adding active microorganisms into the bioreactor, immobilizing microorganisms on the PVC foam carrier, and carrying out the process in the anoxic/aerobic conditions at phase durations of 0.5 and 5.5 hours, respectively. The above parameters allowed us to obtain the following eliminations: 87% of chemical oxygen demand (COD), 97% of biochemical oxygen demand (BOD5 ), 98% of petroleum ether extractable organic (PEEO) and more than 96% of total content of hydrocarbons determined by infrared (IR) spectrophotometry. The chromatographic analyses showed almost complete reduction of oily hydrocarbons contained in the used MWF.

3

Coagulation of wastewater containing reactive dyes with the use of polyaluminium chloride [PAC]

100%

Klimiuk E., Filipkowska U., Libecki B.

Polish Journal of Environmental Studies

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1999

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tom 08

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nr 2

4

Water retention time in intermittently dosed sand filters

88%

Blazejewski R., Murat-Blazejewska S.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 2

289-292

This paper presents a simple theoretical approach to calculating of the retention time of water and/or wastewater in intermittently dosed filters. It assumes that a single dose of water is completely mixed with the previously stored water in the filter and that the field capacity of the granular medium is achieved before the next wastewater application. Retention time is weighted by the water volume stored within the filter. It is presented in a discrete form. The model was successfully validated on the basis of empirical data gathered by Schudel and Boller.

5

Issledovanie vlijanija aehracii na pokazateli stochnykh vod i aktivnogo ila na vykhode iz aehrotenka

88%

Gornostal' S., Petukhova E., Ajjrapetjan T.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 6

6

A survey on nitrogen and phosphor compound variation processes in wastewater stabilization ponds

88%

Pirsaheb M., Fazlzadehdavil M., Hazrati S., Sharafi K., Khodadadi T., Safari Y.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 3

Being economical has increased utilization of stabilization ponds to remove different contaminants from wastewater in proper weather conditions. Our current study investigates variations of nitrogen and phosphorous compound concentrations in effluent of wastewater stabilization ponds. 60 samples were taken from raw wastewater, anaerobic pond (AP) effluent, primary and secondary facultative ponds (PFP and SFP), and effluent of final ponds in weekly intervals for 3 months. Samples were examined based on standard methods (20th edition) for the examination of water and wastewater. Nitrogen kjeldahl removal output due to the AP, PFP, SFP, and the whole system were 20.6±4.9, 6.6±3.4, 13.4±9.5, and 47.7±9.1%, respectively. Nitrite removal output due to the PFP, SFP, and the whole system were 30.1±8.8, 36.3±9.8, and 58.8±5.2%, respectively. Respective values for phosphor removal output in AP and SFP, and the whole system were 21.8±10.3%, 13.3±10.1%, and 20.9±17.1%. However, nitrite concentrations in all samples from AP effluent and phosphor levels in all samples from PFP effluent increased compared with those of influent. The results showed that AP plays an important role in removal of organic nitrogen and phosphorous compounds. While the whole system output in nitrogen compound removal was 58.8±5.2%, phosphor removal output showed low efficiency (20.9±17.1%). Increasing the number of complete ponds is suggested for increasing phosphor removal efficiency.

7

Toxic effect of chemical disinfection of wastewater on freshwater ciliates

88%

Madoni P., Gorbi G., Taje E.

Acta Protozoologica

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1998

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tom 37

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nr 4

8

Theoretical studies and calculations of wastewater treatment in trickling biofilters

75%

Kolpakova O.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 8

9

Optimizacija khimicheskikh komponentov pri reagentnojj obrabotke stochnykh vod

75%

Ehpojan S., Movchan S.

Motrol. Motoryzacja i Energetyka Rolnictwa

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2015

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tom 17

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nr 6

10

Influence of some properties of potential sorbent on P-removal from domestic wastewater

75%

Karczmarczyk A.

Annals of Warsaw Agricultural University. Land Reclamation

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2000

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tom 30

59-65

11

Dairy wastewater treatment by two-stage activated-sludge with a sequencing batch reactor [SBR]

75%

Janczukowicz W., Krzemieniewski M., Pesta J., Szewczyk M.

Natural Sciences

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2001

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tom 08

111-121

12

Variability of COD and TKN fractions of combined wastewater

75%

Zawilski M., Brzezinska A.

Polish Journal of Environmental Studies

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2009

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tom 18

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nr 3

501-505

Our paper analyzes the quality of combined wastewater in the aspect of its biological treatment. Fractions of chemical oxygen demand (COD) and total Kjeldahl nitrogen (TKN) in the inflow to the Group Wastewater Treatment Plant in Łódź were determined. The research revealed a distinct increase of inert fractions during wet weather caused by an increasing portion of contaminants bound with suspended solids.

13

Wastewater flocculation using a new hybrid copolymer: modeling and optimization by response surface methodology

75%

Dawood A. S., Li Y.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 1

A new hybrid inorganic-organic copolymer, aluminum chloride-poly(acrylamide-co-acrylic acid), was prepared using the free radical polymerization method and employed in this study. The hybrid copolymer was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy-dispersive x-ray spectroscopy (EDS). This hybrid copolymer was used in the flocculation of wastewater as a new flocculant. The design variables in the flocculation experiments were hybrid copolymer dosage and wastewater pH. The central composite design (CCD) for the response surface methodology (RSM) approach was used to develop a mathematical model and to optimize the parameters of the flocculation process in terms of optimal removal of chemical oxygen demand (COD), total suspended solids (TSS), and turbidity. After applying the analysis of variance (ANOVA) of all quadratic models, it was found that the obtained value of the correlation coefficient (R2) was more than 0.98 for all models. The optimum hybrid copolymer dosage was 125 mg/l and the optimum pH 7.55. Under these optimum values, the wastewater treatment achieved 97%, 98.6%, and 88.6% removal of turbidity, TSS, and COD, respectively.

14

The management and development of constructed wetlands for treatment of petrochemical waste waters in Hungary: 35 years of experience

75%

Lakatos G., Veres Z., Kundrat J., Meszaros I.

International Journal of Ecohydrology and Hydrobiology

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2014

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tom 14

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nr 1

15

The influence of the different intensity electromagnetic field on phosphorus removal from dairy wastewater in the steel packing system

75%

Krzemieniewski M., Debowski M., Janczukowicz W., Pesta J.

Polish Journal of Natural Sciences

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2003

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tom 14

16

Effects of shock loads of salt on protozoan communities of activated sludge

75%

Salvado H., Mas M., Menendez S., Gracia P.

Acta Protozoologica

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2001

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tom 40

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nr 3

17

Dynamics of heavy metals leaching from soils with sewage sludge addition

75%

Rosik-Dulewska C., Mikszta M.

Archiwum Ochrony Środowiska

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2001

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tom 27

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nr 1

18

Evaluation of indicator bacteria removal in wastewater treatment processes

75%

Olanczuk-Neyman K., Stosik-Fleszar H., Mikolajski S.

Polish Journal of Environmental Studies

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2001

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tom 10

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nr 6

The results of elimination of total coliforms, E.coli and enterococci from wastewater during mechanical-chemical treatment as well as biological treatment operated in the MUCT system in a full-scale wastewater treatment plant are presented. It was proved that the change of treatment technology resulted in improving bacteria removal efficiency - reduction of the number of total coliforms increased from 0.9 log(10) to 2.5 log(10) and E. coli from 1.0 log(10) to 2.3 log(10). The UV disinfection of effluent from the MUCT system allowed for further reduction of the number of bacteria to 3.4 log(10) when the dose of UV radiation equal to 40 mWs/cm(2) was applied and to 3.8 log(10) at the dose of 52 mWs/cm(2). The geometric mean number of bacteria in the effluent after UV disinfection with the dose 40 mWs/cm(2) was below 50/100 ml of total coliforms, 15/100 ml of E.coli and approximately 30/100 ml of enterococci.

19

Water quality and waste water treatment in Lithuania

75%

Vycius J., Kustiene R., Kusta A.

Przegląd Naukowy Wydziału Melioracji i Inżynierii Środowiska

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1998

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nr 16

20

Efficiency of wastewater treatment in an improved constructed wetland

75%

Obarska-Pempkowiak H., Ozimek T.

Polskie Archiwum Hydrobiologii

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2000

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tom 47

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nr 2

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Efficient control of coagulant dosing in wastewater treatment