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Influence of the type of membrane-forming polymer on the membrane fouling

Świerczyńska A., Bohdziewicz J., Kamińska G., Wojciechowski K.

Environment Protection Engineering

2016

Vol. 42, nr 2

197--210

The effect of the membrane-forming polymer (PES, PAN and PVDF) on the fouling phenomenon has been investigated occurring on the surface of the ultrafiltration membranes used for the polishing of industrial wastewater pre-treated by biological methods. The activated sludge method in SBR reactor was used to treat dairy wastewater mixed with 10 vol. % of landfill leachate. The susceptibility assessment of polymeric membranes to the fouling phenomenon was carried out using the plate-and-frame membrane module SEPA CF-NP produced by GE Osmonics. The following properties of the mem-brane were determined: the dependence of the volumetric flux of the permeate on the process duration, the transport properties of deionized water, the relative permeability of the membrane for the flux of deionized water and for the wastewater flux, as well as the contact angle of the membranes. It can be concluded that the kind of membrane-forming polymer had an influence on the fouling phenomenon occurring on the ultrafiltration membranes used for the polishing of industrial wastewater treated in a SBR reactor.

Agricultural use of wastewater sludge from various sources with special emphasis on total and DTPA-extractable heavy metal content

Aşik B. B., Aydinalp C., Şagban F. O. T., Katkat A. V.

Environment Protection Engineering

2016

Vol. 42, nr 1

45--58

This study was conducted to evaluate wastewater sludge from various sources for agricultural utilization. The results showed that sludge from municipal and food industrial wastewater treatment plants (WWTPs) have high fertilizing value with respect to nutrients and organic matter levels. When the sludge samples were evaluated for their total heavy metal contents, the Pb, Cd and Cu concentrations in all of the sludge samples were found to be below the limit specified by Turkish regulations. However, the Cr, Ni and Zn contents of domestic type, organized industrial zone, food industry sludge samples exceeded these thresholds. Other sludges were found to be suitable for agricultural usage in terms of plant nutrient and heavy metal content. The analysis of the sludge samples from twelve different WWTP’s showed that the agricultural properties and the total and bioavailable (DTPA-extractable) heavy metal fraction varies depending on the sludge samples. Therefore discussed sludges should be evaluated separately for the agricultural utilization potential in terms of soil pollution.

Pilot study on chemical industrial wastewater in tertiary treatment with biofilm for washing belts

Liu J.-M., Xu Y., Zhu Z.-R., Qiao S.-Y.

Environment Protection Engineering

2011

Vol. 37, nr 1

93-104

The biochemical characteristics of chemical secondary effluent of the wastewater treatment plant of Jilin Chemical Industry Corporation have higher residual concentration of CODcr and NH3-N, and lower residual concentration of BOD5 and alkalinity. These biochemical characteristics of chemical secondary effluent in tertiary treatment were studied with a pilot system of biological contact aerators (BCAs) to meet national discharged limits and requirements for washing belts, particularly to meet national limits of ammonia and benzene substances, etc. in the air of a workshop. The highest removal efficiency was obtained in the BCAs system and a scientific basis of reference was provided for reforming the system of pulse flocculated clarifier which can constitute a new approach in tertiary wastewater treatment for washing belts.