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Enviroloop™



The Enviroloop™ System developed by ANDAR involves the integration of up to eight modules of operation for complete waste treatment. Enviroloop™ has been designed in this modular approach so stages can be added as required to comply with tightening regulations. It is a major improvement over traditional effluent treatment systems since the end products (compost and liquid fertiliser) contain no wool grease to contaminate soils or water supplies. The integrated systems are designed to provide cost savings by reducing water use and improving plant efficiencies.

Enviroloop™ involves the integration of up to eight unit operations:
· Removal of solids from the scouring bowls (Heavy Solids Loop)
· The recovery of Wool Grease from the scouring flows (Wool Grease Recovery)
· Chemical flocculation of raw heavy effluent (Sirolan® CF)
· Biological treatment of the Sirolan® CF treated effluent (Sirolan® CF-B)
· Chemical treatment and filtration of rinsewater (Clearinse)
· Evaporation of the Sirolan® CF-B treated effluent (Evaporation)
· Ensure the recycled water has no residual colour or odour (Ozone)
· Composting of the Sirolan® CF treated sludge (Rotocom™)

ANDAR woolscours produce two sources of effluent, 'flowdown' (heavy effluent) and rinsewater (light effluent). The flowdown contains a complex mixture of materials, including woolgrease, suint and dirt. This effluent contains water soluble, solvent soluble and insoluble components in the mixture, all held in a stable emulsion by detergent.
ANDAR has recognised that waste treatment systems work best on handling separate solid and liquid components. The solid and liquid streams of the heavy phase are split in the third module (Sirolan CF), so that downstream processes can be designed and optimised accordingly.
Heavy Solids Loop
The Heavy Solids Loop is designed to provide continuous solids removal from the scouring bowls during processing, while maintaining bowl concentration levels. This system is a combination of a Rotary Fibre Strainer, Hydrocyclones, Feed pump, flow meter, valves, collection tank and pipework. The complexity of Heavy Solids Loops can range from a stand-alone single bowl loop or a combined loop on all of the scouring bowls. The use of a Heavy Solids Loop prior to a Wool Grease Recovery provides protection to the separators reducing wear and maintenance.
Wool Grease Recovery
Bowl liquor is drawn off the first hot scour bowl, where the liquor has the highest grease content. The collected liquor is pumped through the stand-alone WGR plant. Here it is exposed to heat and high speed centrifuging for separation, extracting the various phases from the intermixed liquor. ANDAR offer two Wool Grease Recovery systems:
3 Stage Recovery
For higher grease content wools - traditional system for fine wools.
Separators
ANDAR offer a range of centrifuges including Alfa Laval, Westfalia, Garap, Luzhou or other brands by customer specification.
Primary Centrifuge  
Secondary Centrifuge  
Purifier Centrifuge  
2 Stage Recovery
For lower grease content wools - traditional system for coarse wools.
Separators
ANDAR offer a range of centrifuges including Alfa Laval, Westfalia, Garap, Luzhou or other brands by customer specification.
Primary Centrifuge  
Purifier Centrifuge  
Sirolan CF
The Sirolan CF process uses a chemical flocculation treatment designed to remove solids and grease from wool scouring wastewater. The removal of up to 90% of the wool wax, up to 99% of the solids, and up to 75% of the Biological Oxygen Demand (BOD) from the water waste streams is achievable using this method.
CF Panel
Decanter
Sirolan CF-B
The Sirolan CF-B process uses an aerated biological reactor to remove the biological and volatile chemicals in the pre-treated effluent, neutralising it and degrading its remaining Biological Oxygen Demand (BOD). The resulting biomass is recycled back through the reactor, to cultivate an activated sludge process or sent for dewatering.
Sirolan CF-B works best when there are high levels of dissolved organic solids, and where suspended solids, woolgrease and other insoluble material have been removed from the effluent stream.
Clearinse
The ANDAR Clearinse process is a patented filtration system designed to treat wastewaters and process waters low in grease levels. Combining a chemical reaction with filtration system treats the low strength effluents containing suspended solids. Up to 95% of the rinsewater can be recycled back to the scour, reducing overall plant consumption, easing the load on plant heating systems through return of warm water. The addition of turbidity control ensures optimal chemical use whilst maintaining treated rinsewater quality for recycling back to the scour.
Clearinse Module
Polymer Mixing plant
Chemical Dosing Station
Evaporation
The evaporation process produces concentrate by boiling off the water from the treated effluent from the Sirolan CF-B process. The concentrate produced is a liquid stream of organic potassium salts, low in dirt, and free of wool grease and pesticides. This liquid fertiliser has been proven to enhance plant growth in university studies. The condensate produced contains virtually no colour, odour (ammonia) or residual COD or BOD.
Wool scouring plants already with evaporators can have their performance and throughput significantly improved by installing Sirolan CF/CF-B upstream.
Ozone
This optional step for the Enviroloop™ system is added when a 'zero discharge' of liquid effluent is required, and the recycled water must be of good enough quality for reuse in the plant. The Ozone gas is generated and added to the water stream by way of a contactor.

The organics break down into harmless by-products, and the ozone reduces to oxygen gas. The presence of hydrogen peroxide as a catalyst speeds up this reaction, and is converted to water upon reaction with ozone.

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