Can changes be made to com::pass once it is installed?
Yes, but only by us. com:pass is contained within a secure partition of the s::can system which is not accessible to end-users. We can make changes through a secure dial-in facility (with a clients approval) or through a service visit.
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Can I try Sewper Rx in my plant or process?
We will supply a free trial or partial-cost- product to prove that Sewper Rx will do everything that we say – in your plant. You choose the plant, aeration basin, digester or dosing point of your choice.
• All that we ask is –
– We carry out the initial inoculation.
– You work with us before and after inoculation to determine the best test application to achieve the desired results.
– Your make available and store a record of the results before and after the test such that improvements can be correctly identified.
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Does com::pass control pH?
Com::pass controls the coagulant dose, it does not control the coagulation pH. It is highly recommended that coagulation pH be controlled to an optimum. We can compensate for sub-optimal pH control using a local calibration but this is not a cost effective method of control. Coagulation control is particularly important if the end user wishes to use the enhanced coagulation mode.
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How does com::pass actually control the coagulant dose?
com::pass calculates the coagulant dose in a user specified unit (e.g. mg/L as Al3+) which is input to the plant control system via a 4-20mA or RS485 Modbus signal. A function block in the plant control system must be used to convert this to a volumetric coagulant flow rate using the plant inlet flow measurement. The coagulant dose pump is then controlled to achieve the required coagulant flow rate (note that this requires coagulant flow metering).
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How does it achieve reductions in chemical costs?
When com::pass operates in conventional mode it identifies the lowest possible coagulant dose required to reliably achieve turbidity targets (e.g. <0.1NTU). It does this continuously, responding instantly to changing conditions. This ensures that the coagulant is neither under-dosed nor over-dosed. If coagulant dose is manually controlled the operators are naturally conservative and tend to overdose to avoid treatment issues. This is particularly true when dirty water conditions are expected, for example over the weekend. When compared to manual operation com::pass has shown up to 35% reduction of coagulant. When compared to streaming current meter (SCM) controlled coagulant dose, reductions are typically 15% but have been up to 21% on some installations.
The reasons for the reduction when compared to SCM control are two-fold; some reduction results from the smoother process control, due to less interference from other variables such as pH, however the majority of the reduction occurs when water quality conditions are improving. In this situation com::pass reduces the coagulant dose in line with water quality improvements whereas the SCM retains a residual charge and takes longer to lower the coagulant dose.
Where alkalinity and/or pH correction chemicals are used (e.g. Lime and CO2) the dose rate of these chemicals is reduced in proportion to the reduction in coagulant dose. This increases the overall chemical cost savings.
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How Does Sewper Rx work?
When mixed with wastewater Sewper RX rapidly and comprehensively degrades and eliminates organic matter
Is Sewper Rx just another ‘Designer Bacteria’? No, although unique DNA chains of the Bacillus sp and yeast are what is patented, the specific blend of minerals, nutrients and organic materials combined to those organisms in the manufacturing process are what makes Sewper Rx the very aggressive biosolids neutralizer that it is.
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How is NOM characterised?
com::pass uses the solids compensated UV-Vis spectral data to derive the molecular weight of the NOM present. The mathematics for achieving this is proprietary. However a good analogy is the specific UV absorbance or SUVA. This is widely used parameter which provides an approximation of the molecular weight of NOM. The larger the SUVA number the larger the molecular weight of NOM and the more likely it is to be amenable to coagulation and removal by subsequent solids separation. Com::pass uses its NOM characterisation parameter to determine how both NOM and particulate matter will influence coagulant demand.
This is unique to com::pas and it is the reason why com::pass works for all conditions on multiple water types. Many water supply operators fail to realise how dynamic the changes in SUVA and NOM composition can be even on apparently stable sources.
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How is NOM quantified?
The s::can UV-VIS spectro::lyser can measure a range of standard NOM measurement surrogates such as Total Organic Carbon (TOC), dissolved organic carbon (DOC), absorbance at UV254nm as well as more customised measurements used by com::pass such as the area under the solids compensated absorbance curve in the range 250 to 350 nm.
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How often do changes need to be made to com::pass?
For a global calibration, changes may be required during the first 3 months of operation. This period is covered by the post installation support agreement. Following a local calibration no further changes should be required for routine operation. If changes are made to the process e.g. a coagulant change, then it will be necessary to modify the com::pass settings.
A further recommendation we make is that an operator adjustment factor be added to the plant SCADA system. This is a simple multiplier on the predicted dose output. This can be useful if intermittently dosing powdered activated carbon downstream of the sample point. In this situation the coagulant demand may be lowered by the PAC dosing and by using a multiplier of 0.9 for example overdosing can be avoided.
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Is Sewper Rx safe to handle? Are there any waste product disposal issues associated with Sewper Rx?
Waste products produced by Sewper Rx are limited to water and CO2.
Is there a biomass residue left by Sewper RX? No, there is no slime or dead biomass buildup.
Is there a Material Safety Data Sheet on Sewper Rx? Yes, available on request.
There are no special handling conditions.
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