Advanced treatment for municipal wastewater reuse in agriculture. III - Ozone disinfection

Results of a pilot (100 m(3)/h) investigation on ozone disinfection of muni cipal tertiary effluents for reuse in agriculture carried out at West Bari (S. Italy) treatment plant are presented. Among dosages, contact times and advanced treatment schemes investigated it was demonstrated that ozone disi nfection results in the achievement of the WHO microbial guideline (1,000 C FU/100ml for Fecal Coliforms) for unrestricted wastewater reuse in agricult ure of both clarified and clarified-filtered municipal secondary effluents; it is very effective towards Pseudomonas aeruginosa, rather effective towa rds Giardia lamblia and substantially ineffective towards Cryptosporidium p arvum and it forms limited amount of DBP (approx. 350 ppb of total aldehyde s). O&M costs amount to 37 Euro/1000m(3).