Readings:

Time: 0825
Inside Temp: 45 deg F/ 7 deg C
Outside Temp: 27 deg F/ -3 deg C
Relative Humidity: 65%

Time: 1215
Inside Temp: 69 deg F / 21 deg C
Outside Temp: 33 deg F / 1 deg C
Relative Humidity: 62%

Time: 1807
Inside Temp: 65 deg F/ 18 deg C
Outside Temp: 44 deg F/ 7 deg C
Relative Humidity: 61%

Minimum Temp (& RH): 38 deg F/ 3 deg C (79%)
Maximum Temp (& RH): 63 deg F / 17 deg C (15%)
(Note: Temperature readings were taken in Fahrenheit; Max/min T will now be taken from Channel 1 of the Oregon Scientific unit (located to the right of the southern window); remember to clear the memory every day by pressing "Memory" for 3 seconds.)

Normal chores in the GreenHab were performed on each of these occasions.

• Both aerators were not working, because CB 14 was off. CB 14 was turned back on the aerators were working again in Tank #2 and in Tank #4.
• Only air bubbles in Tank #2 & 4
• All plants were sprayed with water and fed. Currently the carrots are growing, and some radishes and alfalfa sprouts have sprouted in the last 2 days.
• The sump pump is connected to a timer which activates the system at 12:00 hours and 00:00 hours.
• The lemma and azola plants are in Tank 3 and look like they are doing well. Also more lemma and azola were added to Tank 3 by Gus Frederick.
• Water in tank #5 is running normally.
• Turned on recycle pump for 5 minutes at each temperature reading interval to have water run through Peter's soil experiment setup. This water flows through the rock area and into Tank1 to remove algae from the top of the tank. Close valve after use to avoid water siphoning back to Tank 4. As we have set this up on our last full day, we haven't had a chance to see if it causes any problems. The main anticipated problem is that the small volume will make the water in the gravel bed prone to overheating, so turning on the recycle pump to flush it with colder water is important. Currently there are two water lettuces in there. We will discuss this with the incoming crew tomorrow. It is not an integral part of the system so it can be scrapped if it causes too many problems, but lets give it a go first.
• The TST tank is still being filled as required by the pump.
• TST water filter flowrate is acceptable.

Additional Chores:

• None today.

Open Issues:

• TST work - Float Switch
  Status: Found the silver float switch.
  Proposed Action: Have Crew 28 install a new float switch per instructions.
• Tacking down loose wires
  Action: will be done in the coming days.
  
  
• Yellow Laptop as part of HOBO logger system
  Status: The yellow laptop hab computer has some port malfunction which is preventing the HOBO download. During the HOBO testing, the baud rates were synchronized and correct port selected. The manual suggests that it might have been due to another program on the computer interfering with the Boxcar 4.3 program.
  Proposed Action: Gus will evaluate it during Crew 28 rotation.
  
  
• Treatment system appears not to be removing nitrate.
  Status: Innoculated trickling filter #2 with more bacterial solids the from 110 gallon tank. The
  Observation: In Tanks #1 & 3, there is a definite thermocline in the water tank (basically the top is hot and the water at the bottom is cold). Tanks 2& 4 do not have this issue, due to the aeration providing mixing.
  Recommendation: Reduce the thermocline. By one of the following options: 1) Add stirrers to the tank 2) have water drawn from deeper in the tank (may also move solids from tank to tank though) 3) add intermittent aeration to tanks 1 & 3
  
  
• Treatment system has a low NH3 load but if increased
  Status: No obvious nitrification occurring. If needed though aeration would probably need to be increased for Tanks 2 & 4.
  Proposed Action: First, determined the dissolved oxygen (there is a 3 step DO tester in the blue Hach water kit on the upper shelf in the GreenHab). [Download procedures form Hach website based upon Part # on the DO bags]. If DO is <2.0 mg/L in the Greenhab, then increase aeration in Tanks 2 & 4 by connecting the extra aerator from downstairs lab bench to the system.
  
  
• Trickling Filter Covers
  Proposed Action: Move green screen back temporarily with poles. Then remove black covers. Put the black trash bag covers over a frame (either pipes or wood) to lift the covers by 1-3" above the top of the tanks.
  
  
• Intermediate Plant screen for Tank #4
  Proposed Action: Put in a vertical screen to prevent plants from floating underneath the back cover. Create a horizontal wood bar to bridge the width of the tank. Then tack a screen to the board and have it weighted to fall below the water surface. Then tack a black trash bag to the board and have it drop over the back of the tank.