Page 93 - Minerva Foods | Annual Report 2017

Total water discharge by quality and destination 306-1
2017
Total volume of water discharged
4,470,070
Destination
For the Barretos, José Bonifácio, Mirassol D’Oeste, Palmeiras de Goiás, Rolim de Moura and Várzea Grande units, all treated effluents are sent to
a receiving body; for the Araguaína unit, fertigation is done on the Company’s property; and for the Janaúba unit, all effluents undergo secondary treatment and are sent for treatment at the municipal Effluent Treatment Station.
Water quality
Monthly analyses are carried out
to monitor the efficiency of the system for all units; the efficiency of removal of organic load measured in BOD is above 85% removed, which is in excess of legal requirements.
Treatment method
Effluent Treatment Stations (ETEs) for all units are made up of primary treatment (grading, sifting,
fat retention) and secondary treatment (anaerobic, facultative and polishing ponds; for the Mirassol D’Oeste unit, activated sludge).
Was water reused?
For the Araguaína, José Bonifácio Mirassol D’Oeste and Janaúba units, the water used for washing
the corral comes from
grey water, whether from Water Treatment Station backwashing or from de- icing the chambers. The Barretos unit collects all
of its backwashing water and returns it for treatment at the Water Treatment Station in a closed circuit. The fertigation project
at Palmeiras de Goiás
is being finalized with installation of equipment (pipes and spray nozzles).
All units in Paraguay and Uruguay permanently monitor parameters of effluents according to cor- porate management policy. Moreover, all plants have Effluent Treatment Stations (or ETEs).
The total volume of effluents in 2017 for Plant 2, in Paraguay, was 408,521 m3, of which 36,500 m3 was used to wash corrals. At Plant 8, also in Paraguay, there were 356,111 m3 in total effluents for the same year, and the entire volume at both units went to the collector.
At Uruguay units – Pul and Carrasco – total effluent volume was 549,811 m3 and 463,745 m3, res- pectively. At the Pul unit, effluents went to a water course, while at the Carrasco unit they went to the collector.
Operations in Uruguay and Paraguay – parameters used to monitor effluents
Year
Paraguay Plant 2
Paraguay Plant 8
Uruguay Pul
Uruguay Carrasco
Biochemical Oxygen Demand (BOD) – annual average (mg/l)
71.5
100.7
32.3
120.7
BOD parameter Legal requirement (mg/l)
250
250
60
700
Total solids in suspension – annual average (mg/l)
45.8
68.2
43.9
250.5
Total solids in suspension parameter Legal requirement (mg/l)
500
500
150
N/A
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