The document describes the Aquazone waste water disinfection system, which uses automated chemical dosage control to save costs and ensure disinfection. Key aspects of the system include: - Continuous monitoring of flow, ORP, and other parameters before and after chemical dosing. - Remote control and monitoring of the system over the internet to adjust parameters and dosing pumps as needed. - Alarms sent by email or SMS in the event of issues. The system aims to correlate ORP measurements with disinfection levels to effectively control dosage of chemicals like peracetic acid under varying temperature, pH, dissolved oxygen, and total suspended solids conditions commonly found in secondary or tertiary treated waste water. Field

1. Aquazone waste water disinfection;
chemical dosing automation solution
• Aquazone waste water disinfection solution is
based on automated chemical dosage control.
• Aquazone dosage automation saves chemical
costs and ensures disinfection result.
• Aquazone system is remotely monitored and
controlled.

2. Discharge pipe or contact basinSecondary or tertiary treated effluent Waste water discharge
Continuous measurement
after dosing:
• ORP/disinfection index
• (PAA residue)
Chemical
dosing
Continuous measurement
prior to dosing:
• Flow
• ORP
• TSS
Dosing control
Internet/3G/GPRS
Online monitoring of:
• Measurement parametres
• Chemical consumption
• Disinfection index
Dosing control
Online remote control
adjustments and maintenance:
• Adjustment of control
parametres (IP/SMS)
• Direct change of dosing pump
(IP/SMS)
Alarms
• E-mail
• SMS
Aquazone system overview

3. ORP Measurement for PAA control
(a) Impact of water quality parametres for ORP and disinfection result
correlation:
Temperature: Temperatures can affect ORP measurement in variety of ways
but no systematic dependence between ORP and T exists. Typically ORP
electrodes don’t have any kind of “temperature compensation”. Wastewater
temperature varies (in Finland) between +9C up to +20 C. Lab and field tests
show that at least within this range the correlation between microbes and ORP
is statistically meaningful. Specific limits not identified.
.
pH: studies (lab and field) made within normal WW pH range, i.e. appr. 7 – 8.
Since wastewaters are generally well buffered against pH changes, pH is
practically always within this range.
DO: Typically treated wastewaters contain DO appr. 5 – 10 mg/l depending on
temperature and WWTP process. In this range ORP – microbes correlation
works well.

4. (b) Impact of water quality parametres for ORP and disinfection result correlation:
TSS: general observation is that method works if PAA is feasible agent for disinfection. I.e.
secondary and tertiary treated water. It should be noted that ORP –microbes correlation
should be “calibrated” for each site.
COD: observations gathered from 4 trials. Seems that there is no impact. in typical variation
range of COD in secondary of tertiary effluents (appr. 10 – 50 mg/l).
ORP Measurement for PAA control

5. Jyri Koivisto
CEO, eMBA
jyri.koivisto@aquazone.fi
+358 40 725 9009
www.aquazone.fi
Further information
www.aquazone.fi