Wyniki wyszukiwania - BazTech

1

The Influence of Electrical Current Density and Type of the External Source of Carbon on Nitrogen and Phosphorus Efficiency Removal in the Sequencing Batch Biofilm Reactor

Kłodowska I., Rodziewicz J., Janczukowicz W.

Journal of Ecological Engineering

|

2018

|

Vol. 19, nr 5

172--179

EN

This work presents the results of a study on the effect of electrical current density (53, 105, 158 and 210 mA/m2), type of the external source of carbon (citric acid, potassium bicarbonate), and C/NNO3 ratio (0.5, 1.0 and 1.5) on the effectiveness of nitrogen and phosphorus removal from synthetic wastewater with physicochemical parameters typical of municipal sewage subjected to bio-treatment in the highly efficient system for organic compounds removal ensuring efficient course of the nitrification process. The denitrification efficiency was found to depend on the type and dose of carbon and on the electrical current density. Higher values of this parameter were determined in the reactor with citric acid than in one with potassium bicarbonate used as carbon sources. Total phosphorus was removed in the processes of electrocoagulation and biomass growth. Higher efficiency of dephosphatation was achieved in the reactor with electrical current passage than in the reactor without it. The type of carbon source had little effect on the dephosphatation efficiency. The use of electrical current density of 210 mA/m2 and citric acid as a carbon source with C/N=1.5 allowed achieving 87.61(±1.6)% efficiency of denitrification and 97.69(±2.1)% efficiency of dephosphatation.

2

Effect of Acetic Acid on Denitrification and Dephosphatation Process Efficiencies in Sequencing Batch Biofilm Reactor

Mielcarek A., Rodziewicz J., Janczukowicz W., Bryszewski K.

Journal of Ecological Engineering

|

2018

|

Vol. 19, nr 4

176--180

EN

This study investigates the feasibility of using an organic substrate in the form of acetic acid to enable wastewater denitrification in a Sequencing Batch Biofilm Reactor (SBBR). The impact of nitrates presence on the yield of biological dephosphatation was determined as well. The experiment included 296 cycles and was divided into 4 series differing in the load of nitrates. The N:(C and P) ratios were: 7:(140 and 7); 35:(140 and 7); 70:(140 and 7) and 140:(140 and 7). The hydraulic retention time in the reactor was 12h (6h of mixing – dissolved oxygen concentration below 0.1 and 6h of aeration – concentration of dissolved oxygen 3.0±0.8 mgO2·dm-3). The study demonstrated that the 30-day adaptation period (60 cycles) was sufficient for the development of a stable biofilm. The C:N ratio of 2 ensured the total nitrogen concentration in the effluent below 1 mgN·dm-3. The mean efficiency of biological dephosphatation reached 7.0, 17.4, 18.7, and 30.3% in series 1–4, respectively. In the case of series 2 and 3, no significant differences were demonstrated in the total phosphorus concentration in the effluent. In the other series, the differences turned out to be significant.

3

Usuwanie fosforanów z wykorzystaniem osadów potechnologicznych pochodzących ze stacji uzdatniania wody

Totczyk G., Klugiewicz I., Pasela R., Górski Ł.

Rocznik Ochrona Środowiska

|

2015

|

Tom 17, cz. 2

1660--1673

EN

With the treatment of water, especially surface waters, there is produced a high amount of sewage and sludge. They make up a serious ecology problem that due to a high volume and the content of sludge of iron or aluminium oxide-hydroxide or, pollution which occur in the intaken water (mineral and organic substances, algae, protozoa and bacteria) as well as the chemicals added. The environmental protection requires limiting materials as well as it makes you search for effective waste management problem-solving methods. The waste generated at present during water treatment most often undergo dehydration and drying and then they are deposited at the landfill site. The currently binding environmental protection law makes you look for the possibilities of the use of sludge as recycled materials, e.g. in brick factories, cement factories or with sewage treatment. Sludge containing aluminium or iron can be used e.g. in the process of municipal sewage treatment. The application of sludge containing aluminium for dephosphatation has the advantage of protecting the system from secondary release of precipitated phosphates in the environment deprived of dissolved oxygen. The possibilities of sludge application to remove phosphates differ, depend not only on the sludge characteristics but also on the sewage treatment process. The article demonstrates the results of research into using sludge derived from water treatment station in Lubicz to remove phosphates from sewage. At present the sludge after sedimentation and mechanical dehydration with the filtration press finally reaches the municipal landfill site. The sludge, applied for research, concentrated in settling vessels, is a mixture of post-coagulation sludge and washings from anthracite-sand and carbon filters. Its hydration accounting for 98,7% shows a high colour, above 80 mg Pt/dm3, it contains about 2,6 g/dm3 of aluminium as well as organic compounds expressed with BOD5 value equal 170 mg O2/dm3. The sludge shows a high COD of 3990 mg O2/dm3, and organic substance – for 31,6% of dry weight. The study of effectiveness of the removal of phosphates was made with the vessel test method. The sludge was dispensed at a changing volume from 0,5 to 100 cm3 per 1 dm3 of prepared water and then sewage. Both in water and in sewage there was recorded a 90% removal of phosphates by applying 80 cm3 of sludge per 1 dm3 of the sample. Additionally there was investigated the effect of dispensed sludge on the effectiveness of sewage treatment with the model of the treatment plant with rotating biological contactors. Applying the rate of 40 cm3 of sludge per 1 dm3 produced 96,0% elimination of COD, 97,7% removal of organic compounds characterised with the values of COD and BOD5 as well as 100% removal of phosphates. Finally it was found that it is possible to use the sludge to remove phosphates from sludge. During dephosphatation there was reported no use-up of the natural alkalinity of sewage. Sludge dispensing did not result in a decrease in the effectiveness of sewage treatment with the method of rotating biological contactors. The research is preliminary in nature and it needs to be continued.

4

Procesy usuwania związków azotu i fosforu w sekwencyjnym reaktorze porcjowym z błoną biologiczną (SBBR)

Mielcarek A., Rodziewicz J., Kupczyk K., Rokicka M.

Logistyka

|

2014

|

nr 4

4683--4688, CD6

PL

W pracy przedstawiono zagadnienia związane z wykorzystaniem biomasy w postaci błony biologicznej w procesach denitryfikacji i biologicznej defosfatacji a także budowę i funkcjonowanie sekwencyjnego reaktora porcjowego z błoną biologiczną (SBBR). Specyfika budowy błony biologicznej daje możliwość występowania stref tlenowych, anoksycznych i beztlenowych w tym samym czasie i w tym samym reaktorze w zależności od profilu błony biologicznej. Stwarza to warunki do zachodzenia specyficznych procesów usuwania azotu i fosforu takich jak denitryfikacja defosfatacyjna.

EN

This manuscript describes issues linked with the use of biomass in the form of a biofilm in processes of denitrification and biological dephosphatation as well as presents the design and functioning of a sequencing batch reactor with biofilm. The specific structure of biofilm makes the occurrence of aerobic, anoxic and anaerobic zones possible in the same time in the same reactor depending on biofilm layer. It facilitates specific processes aimed at nitrogen and phosphorus removal, like denitrifying dephosphatation.

5

Defosfatacja ścieku bytowo-gospodarczego z zastosowaniem złóż obrotowych.

Kosobudzki P., Zoń J., Chmarzyński A., Buszewski B.

Chemia i Inżynieria Ekologiczna

|

1999

|

Vol. 6, nr 2-3

189-196

PL

Przedstawiono wyniki badań dotyczących biologicznej defosfatacji ścieku bytowo-gospodarczego z zastosowaniem złóż obrotowych. Skuteczność usuwania fosforu badano dla ścieków o różnym odczynie i kontrolowano na podstawie analizy parametrów sumarycznych - fosfor całkowity, chemiczne zapotrzebowanie tlenu (ChZT), pięciodniowe biochemiczne zapotrzebowanie tlenu [wzór], całkowity węgiel organiczny (TOC).

EN

In the present work, the results of investigations of dephosphatation process of domestic sewage has been described. As a searching model rotating bioreactors were used. For the control of the course of biodegradation process, summary parameters were determined eg. total phosphorus, biochemical oxygen demand, chemical oxygen demand, total organic carbon.

6

Przebiegi i skuteczność koagulacji wapnem w defosfatacji roztworów wodnych.

Korneluk H., Świderska-Bróż M.

Archiwum Ochrony Środowiska

|

1998

|

Vol. 24, no. 3

47-55

PL

W pracy przedstawiono wyniki badań defosfatacji roztworów wapnem oraz, dla celów porównawczych, innymi alkaliami. Analiza uzyskanych danych potwierdziła dużą przydatność procesu koagulacji wapnem w usuwaniu fosforu Wymaganą efektywność defosfatacji (ck = 4,5 g PO4/m3) uzyskano w zakresie pH = 9,5 - 12. Stwierdzono, iż głównym czynnikiem decydującym o skuteczności usuwania fosforu była wartość pH oczyszczanych roztworów, mniejsze znaczenie zaś miał rodzaj czynnika strącającego. Porównanie ilości wykorzystanych jonów wapnia i magnezu oraz ocena wpływu pH na ilość usuniętych związków fosforu wykazały większą rolę Ca2+ oraz wytrącającego się CaCO3 niż Mg2+ i Mg(OH)2.

EN

Study results of lime dephosphatation are presented. Analysis of obtained data confirms lime coagulation usefulness as phosphorus removal process. Required dephosphatation effectiveness was achieved at pH = 9,5 - 12. The efficiency of phosphorus removal depended mainly on pH value. Less important agent was the kind of precipitated reagent. The investigation results indicate that the role of Ca2+ ions and precipitated CaCO3 in the dephosphatation process was higher than Mg2+ ions and Mg(OH)2 precipitating.