Original scientific paper

Reuse of urban waste water for irrigation of agricultural land using membrane processes

Davor Dolar orcid.org/0000-0002-4699-1298 ; Sveučilište u Zagrebu, Fakultet kemijskog inženjerstva i tehnologije, Zagreb, Hrvatska
Iva Ćurić ; Sveučilište u Zagrebu, Fakultet kemijskog inženjerstva i tehnologije, Zagreb, Hrvatska
Nada Glumac ; Međimurske vode d.o.o., Čakovec, Hrvatska

Abstract

The urban waste water treatment was a hybrid process that included a membrane bioreactor (MBR), nanofiltration (NF) and reverse osmosis (RO). The application of RO/NF permeates for irrigation of agricultural land was assessed. Electrical conductivity, turbidity, concentration of suspended particles and chemical oxygen demand were reduced when using MBR by 19.1 %, 99.8 %, 100.0 % and 96.7 % on average. Additional treatment of MBR permeates using RO/NF membranes resulted in a reduction of all parameters. The reverse osmosis XLE membrane caused the biggest reduction in all monitored parameters, and the nanofiltration NF270 membrane caused the least. RO/NF permeates comply with the instructions of the World Health Organization, with adaptation of the electrical conductivity and sodium adsorption ratio by the addition of calcium salts or mixing the MBR effluent with the permeate of the NF270 membrane in a 50:50 ratio. According to the European Union instructions, RO/NF permeates belong to Class A quality of reused water.

Keywords

reuse, urban waste water, membrane processes, irrigation

Hrčak ID:

281424

URI

https://hrcak.srce.hr/281424

Publication date:

30.6.2022.

Article data in other languages: croatian german

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