Wyniki wyszukiwania - BazTech

1

Konstrukcja i innowacyjne rozwiązania filtrów powolnych

Dąbrowski W.

Instal

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2017

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nr 5

46--49

PL

Najpierw przedstawiono tradycyjne zasady projektowania filtrów powolnych. Następnie opisano wyniki nowych badań i zmiany technologii filtracji powolnej oraz zaprezentowano zastosowanie tego procesu do uzdatniania wody w chwili obecnej i w perspektywie historycznej. Na końcu przeanalizowano przykład dużej stacji filtrów powolnych w porównaniu ze stacją filtrów pospiesznych zasilaną tą samą wodą surową i dostarczającą wodę do tej samej sieci wodociągowej.

EN

First traditional rules of slow sand filters design have been described. Then new trends based on recent research results have been briefly summarized. Finally an example of a large filter plant has been analyzed in comparison with a rapid filters plant, supplied with the same raw water and serving for the same town.

2

Fraction of heavy metals in sludges from typical coking wastewater treatment plants by modified BCR sequential extraction procedure

Diao C. P., Wei C. H.

Environment Protection Engineering

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2017

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Vol. 43, nr 4

191--207

EN

Fractions of 8 heavy metals (Cd, Cr, Hg, Cu, Zn, Pb, Ni and As) in sludges from two typical coking wastewater treatment plants were determined by atomic absorption spectroscopy (AAS) using the modified the European Community Bureau of Reference sequential extraction procedure as the pretreatment technology. The sludges from biological, coagulation deposition units and the discharged sludges of two plants were sampled and the exchangeable, reducible, oxidable, residual fraction and the total content were determined. The oxidable or residual fraction was the predominant fraction in various sludges and on the contrary that the values of the exchangeable and reducible fractions were much lower. Poor biological availability and low potential environment risk of heavy metals was found in sludges from typical coking wastewater treatment plants. Further results of cluster analysis conducted by SPSS that the units with similar conditions could be classed together identified that the unit condition was one key factor affecting on the fraction of heavy metals in sludges.

3

Denitrifying phosphorus accumulating organisms enrichment and their characteristics in a denitrifying enhanced biological phosphorus removal system

Zou H., Wang Y.

Environment Protection Engineering

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2017

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Vol. 43, nr 3

225--237

EN

Denitrifying phosphorus accumulating organisms (DPAOs) play an important role in simultane-ous removal denitrifying nitrogen (N) and phosphorus (P). Their enrichment and characteristics were investigated. A denitrifying EBPR reactor, performing continuous anaerobic/anoxic conditions, was used to enrich DPAOs in this study. Through 60 days operation, DPAOs was successfully cultivated in the denitrifying EBPR system and P concentration in the effluent was stable and low with less than 0.5 mg/dm3. Energy dispersive spectroscopy (EDS) analysis showed that P content in anoxic end sludge gradually increased with enrichment operation, which accounted for 2.9, 4.7, 6.2, and 7.9 wt. % in sludge samples at day 0 (i.e., seed sludge), and days 20, 40 and 60, respectively. Based on the batch test, a significant positive correlation was found between COD consumption and P release in anaerobic conditions and between nitrogen removal and phosphorus uptake in anoxic conditions. Furthermore, in anaerobic conditions, the P release rate was 4.2 mg P/(g MLSSh) being higher than the P uptake rate (2.8 mg P/(g MLSS h)) in anoxic conditions. Despite this, total anaerobic P release (8.5 mg P/(g MLSS)) was lower than anoxic P uptake total amount (11.2 mg P/(g MLSS)), implying an excess P uptake in anoxic environment. One whole cycle displayed the obviously denitrifying simultaneous nitrogen and phosphorus removal with more than 95% removal efficiencies in the denitrifying EBPR system.

4

Influence of composition of raw wastewater on removal of nitrogen compounds in multistage treatment wetlands

Gajewska M.

Environment Protection Engineering

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2015

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Vol. 41, nr 3

19--30

EN

Influence of composition of raw wastewater on the efficiency of organic matter and nitrogen removal in multistage treatment wetlands has been examined. Commonly used indicators, like COD/BOD5 and BOD5/TN ratio, determining wastewater susceptibility to biodegradation in conventional treatment technologies were assessed. It was confirmed that multistage treatment wetland may be used for treatment of wastewater with high loads of organic pollutants and unfavorable composition for a biological treatment expressed by the ratio of COD/BOD5 and BOD5/TN equal to 2.7 and 0.7, respectively.

5

Kinetic studies of decolonisation of concentrates from nanofiltration treatment of real textile effluents in anaerobic/aerobic sequencing batch reactors

Klepacz-Smółka A., Paździor K., Ledakowicz S., Sójka-Ledakowicz J., Mrozińska Z., Żyłła R.

Environment Protection Engineering

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2009

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Vol. 35, nr 3

145-155

EN

The aim of the research was to investigate the degradation of real textile wastewater concentrate obtained in the nanofiltration processes. An anaerobic/aerobic sequencing batch reactor system working in a 24-h cycle was applied. The anaerobic phase aimed at the reduction of Reactive Red 120 molecules was followed by the aerobic oxidation of aromatic amine (orthanilic acid) released from azo dye. Two different successive decolourisation periods were observed in the anaerobic bioreactor for two tested concentrates of textile wastewater. A first-order reaction model was used to describe the decolourisation process. Furthermore, the relation between COD reduction and the concentrate decolourisation was observed. The aromatic amine was completely degraded in the aerobic stage only in the case of two-fold-concentrated textile wastewater.