OC Laboratory

Laboratory Event      

Event Coordinator - 

Kim Furry

Check out the NEW Laboratory Event Tutorial

Event Info Bench Sheet and Calcs Mass Balance TablesMulti Lab
2021 Event Description 
updated 2/17/21
TDS_Bench_Sheet.xls Mass_Balance_Test_Metric.docx Table LayoutW-142 MultiLab Ordering Form Guide
Judges Sheets
updated 2/17/21
TSS_Calculation_Sheet.xls Mass_Balance_Test.pdf**Scale Table: 
MultiLab 4010-2W Conductivity Temp jpg
 TSS_Preparation_Sheet.xls **MultiLab Meter Table:  https://youtu.be/gABYa1o3M08  W-142 MultiLab Ordering Form Guide
 Solids Loading Calculation Sheet and Plant Diagram.pdf 2/25/19  YSI Meter and Probe Ordering Details
 Solids Loading Calculation Sheet and Plant Diagram - METRIC 2/25/19  Example Invoice for YSI
**This video is for informational purposes only and may not necessarily be a clean run.  Please refer to the Team Resource Site for the newest version of the rules/tasks/guidelines.

Ask A Question

Questions accepted up until 10/8/21. Questions can be asked at the pre-competition meeting on Monday October 18th  in Chicago.
 Question Answer Date
Not a question...Just FYI the part number for the Carboy in the event description is wrong... the number given is for a carboy WITHOUT the spigot...this should probably be changed.The equipment list has been updated with the correct product number.1/13/20
Can the person on the Mass Balance complete both forms for TSS? Or does the person doing the filtering have to complete one?The same person may complete both TSS bench sheets.
Under procedures for Preparation and Analysis of Total Suspended Solids Samples Item #8
In bold print and starting in all caps--8. NOTE: DO NOT OVERFILL the filter flask.
In looking at the judges sheets, I can't seem to find it listed as a violation. Will overfilling the primary filter flask result in a penalty? If water is allowed into the vacuum pump from the secondary filter flask is that an additional and/or greater penalty?
This is penalty #43 on the Judge 3 sheet.  Technically based on volume, the team should be able to filter all of the samples and not have to empty the primary flask.  If it does carry over to the secondary flask, this will result in the penalty #43.  It should never carry over from the secondary flask to the vacuum pump based on the volumes being used.  This is why the secondary flask was put into place.
Are new mass balance calculation sheets (math portion) going to be distributed in the upcoming month, or couple of months?No, new mass balance calculation sheets will not be distributed.  As of this time, the questions will remain the same this year; however, the plant data at the top will change.  As such, teams should be practicing the calculations utilizing various plant data sets.2/11/20
When seasoning the graduated cylinders on the TDS, can you also use that sample from the cylinders to season the corresponding beakers?
Teams may not rinse the graduated cylinder into the beaker and then discard the solution.  You must rinse the graduated cylinders separately from the beakers.
Do TDS pipettes and beakers have to be rinsed with DI water or can you use samples?
The beakers and graduated cylinders being utilized for the TDS analysis should be rinsed with sample prior to pouring for analysis.  There are no pipettes used in the TDS preparation or analysis.2/18/20
Under Equipment, there are 4-100 ml graduated cylinders listed for use in the event. The procedure states:
3. Label three (3) 100 ml graduated cylinders for the TDS test as follows:
1. BLK (Blank)
2. SEC (Secondary Effluent)
3. EFF (Final Effluent)
NOTE: EFF cylinder can be utilized to measure Effluent Duplicate sample.

Question: Can the 4 fourth unused graduated cylinder be used to measure one of the samples also, if it is properly labeled and rinsed per sampling procedure?

Yes, the fourth unused graduated cylinder may be used to measure sample as long as it is clearing and appropriately labeled and used to measure the TDS sample.3/2/20
Do we need to rinse the beaker and graduated cylinders for the blanks with DI water before filling of the cylinders and beaker with DI water for the blanks?Yes, the beakers and graduated cylinders associated with the blanks should be rinsed with DI water prior to filling them for analysis.
In regards to previous question about overfilling the primary filter flask. I'm still confused as to if the overflowing of filter water into the secondary flask as a penalty? It is stated that it will be a penalty and that emptying the primary will not be necessary with the volume of samples used.

But given the flowing volumes from the procedure:

Blank - 400, Eff - 250, Sec - 250, Pri Eff - 50, Inf - 15, Inf Dup - 15, Aer 1 - 10, Aer 2 - 10 the total volume would be exactly 1000 mls.
Given the procedure asks for 3 -10 ml rinses on the funnel for each sample and 2 rinses of unspecified volumes of each of the graduated cylinders and pipettes, how can technically the procedure be completed without overflow into the secondary flask, if each flask is 1000 mls?

Overfilling the primary flask into the secondary flask will result in a penalty.  If a team uses too much sample or duplicates a sample etc. there is the possibility to go over the volume the flask can hold.  The flask holds more than 1000 mL.  There is headspace between the 1000 mL mark and the opening to the vacuum tubing.  Teams routinely properly perform the steps including rinsing without exceeding the total volume of the primary flask.
For the TSS portion, do all samples have to be processed through the filter pump before weighing the prepared dried samples?No, the dried samples can be weighed during the time in which samples are being processed through the filter apparatus.
Does the Primary flask for the pump have to be emptied when finished?No, the filter flask does not have to be emptied at the end of the event.
Can the oven/cookie tray be moved during set up? 
No, the cookie tray cannot be moved during set-up.9/2/21
Since we are using the same sample for the Final Effluent and Effluent Duplicate and the same cylinder. Do we have to rinse the cylinder for both.
Per the event description (specifically #9 on page 6), the cylinder does not need to be rinsed in between measured amounts.  It only needs to be rinsed prior to measuring the first 100 ml aliquot and placed in a rinsed beaker.
On the YSI Meter, the probe holder and base have the capability to be positioned on either the left or right side of the meter. Will teams be allowed to move them to the position of their choosing during the precheck?The probe will be located on the right hand side of the meter as the team member looks at the meter.  The teams will not be allowed to move the probe to the left side of the meter during set-up or during the event.9/27/21
Can the cookie tray be moved after the event has started?The cookie sheet may be removed from the “oven” at the start of the event.  It cannot be moved during the pre-competition set-up.
1.  Do the teams start at the tables or from the corner of event set up?

2. Will the benchsheets be in one place or split on the two tables?

3. Can the following items be moved during set up?
Sample Bottles; Cookie sheet with filters removed from the "oven" and filters rearranged on the cookie sheet; Filters removed from filter box and separated so they are not stuck together?

4. Are the aluminum weighing pans going to be labeled on the tab or inside of the pan?

5. Can the door to the balance remain open as one filter is removed and a new filter is put in, or does the door have to close in between?
  1. The team members will start at the tables and not from outside of the immediate competition area.
  2. The benchsheets will all be facedown at one location at the TDS meter.
  3. Sample bottles may be moved during set-up.  The cookie sheet may not be moved during set-up.  The filters will be separated by the judges prior to the event.  They will not be able to be moved during set-up.
  4. The tab will be labeled on the aluminum pans.
  5. The door to the balance can remain open in between, but must be closed when a measurement is being taken.
At the end of the even does everything that started on the TDS meter table need to end up back on that table?
Yes.  Everything that starts on the TDS table should end up back on the TDS table.
During setup, can the tin inside the oven be arranged but not removed from oven?No, the tins inside of the oven can’t be moved during set-up.
The procedure calls for 15 ml of volume for INF and INF DUP for TSS, however the TSS calculation sheet has a volume of 25ml for both. Can you please clarify which is the correct volume?The 15 ml is the correct amount for the TSS preparation bench sheet and the 25 ml is the correct volume for the TSS calculation bench sheet.  Teams should use the 25 ml listed on the calculation bench sheet to perform those calculations and use 15 ml when measuring out the volume for the TSS preparation and record 15 ml on that bench sheet.
Will the metric version of the worksheet be available at the local competitions and WEFTEC?The metric version of the mass balance worksheet will be available at WEFTEC.  It is up to the individual event coordinators at the local competitions as to whether they would like to provide a metric version or not.  I recommend reaching out to them directly ahead of time to determine if one would be available or not.4/12/22
Can the rinse bucket be set on the floor under the carboy? In the case of the national event at WEFTEC, that would not be necessary as there will be one of the plastic bins on the floor under the carboy. 4/12/22