Water and Wastewater Plant Directory
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Stellenbosch, Western Cape, South Africa
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L'Ormarins
Between Simondium and Franschhoek
Stellenbosch, Western Cape
South Africa
Contact Information:
Contact: Andrew Hulsman
Email:
andrew@hwt.co.za
Telephone: +27 83 444 2476
Fax: +27 21 782 4765
Plant Operation: Industrial
Processing: Wastewater
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Web site:
http://www.lormarins.co.za
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Plant/Process Description:
The effluent treatment plant at L'Ormarins winery is discretely built below ground level. The treatment process is briefly described below.
Process Description
1) Screened Wine Cellar effluent and sewage is drained to the primary sedimentation and flow balancing tanks. The primary sedimentation tank is designed to retain inorganic solids.
2) Because cellar effluent is low in pH a lime addition arrangement is required. We have developed a simple system whereby clean water is trickle fed to a lime solution holding tank. The overflow lime solution is then fed via gravity to the bioreactor. A geared motor and paddle arrangement ensures that the lime stays in solution.
3) The cellar effluent in the flow-balancing tank is periodically pumped to the biological reactor. This reactor is sized to remove biodegradable COD and ammonia.
4) Biological treatment of the effluent is cyclic and PLC controlled. The operational regime is known as the Fill and Drain method. (This method is similar to Sequencing Batch Reactor operational systems).
At the start of the Fill and Drain cycle, effluent is pumped into the biological reactor until a preset upper water level is reached. At this point aeration commences and continues for a period of approximately two hours. During the aeration cycle, the biomass is completely mixed and biodegradable COD degradation and nitrification take place. At the end of the aeration cycle, a period is allowed for liquid/solid separation - biomass settlement. Thereafter the supernatant is discharged until a preset lower water level is reached. A small rest period allows for accumulation of effluent in the flow-balancing tank, where after the cycle repeats itself.
5) As the treated effluent is discharged a dose pump injects sodium hypochlorite at a fixed
rate. The dose rate is selected to completely destroy bacteria and viruses. The treated effluent is pumped to a constructed reed bed at a pressure of 200 kPa.
6) The treated effluent is pumped to a constructed reed bed for removal of residual COD
and nutrients.
7) Effluent from the reedbed overflows into a storage / irrigation dam.
Because the fill and draw method operates on a batch basis, it is ideal for intermittent flow
regimes. Aeration will take place only when effluent is available. During periods of low flow and load, the plant will stand idle for extended periods. The versatility of the PLC allows for periodic aeration during quiet periods to inhibit anaerobic activity.
Design Parameters
Flow 70 kilolitres per day
Load 200 kg COD per day
Effluent Compliance
COD <75 mg/l
E.Coli <100 organisms/ml
Nitrogen <10 mg/l (Total N)
Phosphorous <1 mg/l (Total P)
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Owner:
L'Ormarins Winery
Web site:
http://Lormarins.co.za
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Operating Company:
HWT
Web site:
http://hwt.co.za
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Directions:
Below manor house and above irrigation dam
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Disclaimer:
Water and Wastewater.com provides the information on
this page for reference purposes only. We do not certify
the accuracy of the information provided by third-party
individuals for this listing.
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