Readings:

Time: 0730
Inside Temp: 52 deg F / 11 deg C
Outside Temp: 38 deg F / 3 deg C
Relative Humidity: 65%

Time: 1345
Inside Temp: 94 deg F / 34 deg C
Outside Temp: 60 deg F / 16 deg C
Relative Humidity: 60%

Time: 1745
Inside Temp: 81 deg F / 27 deg C
Outside Temp: 59 deg F / 15 deg C
Relative Humidity: 60%

Minimum Temp ( & RH): 66 deg F/ 19 deg C (79%)
Maximum Temp ( & RH): 74 deg F / 23 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 are working, one is in Tank #2 and one 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 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 were moved from Tank 4 to Tank 3 today and look like they are doing well.
• Water in tank #5 is running normally.
• Change in Procedure: 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 let's give it a go first.
• The TST tank is still being filled as required by the pump.
• TST water filter flowrate dropped off more today, so the 5 micron filter was changed today. Note: The concentration of suspended solids appears to have gone significantly down over the past few days with the addition of the tank covers.

Additional Chores:

• Nitrification/Denitrification Experiment.
  Operation State: 6hr ON/OFF cycles with a stir bar providing aeration.
  Day 0: Soapy water (1g/l concentration of soap) in a 2L beaker with 1700ml of water was innoculated with 25 ml of concentrated solids from the underground grey water tank. Soapy water of this concentration was shown to have: pH of 7.8; NH3 3 mg/L, NO2 0mg/L, NO3 10mg/L.
  Day 2: Took readings: pH 7.8, NH3 0.25 mg/L, NO2 0mg/L, NO3 0mg/L. Added 2.4 g of Oasis soap/ 1600ml which is ~ NH3 4.5 mg/L, NO2 0mg/L, NO3 15 mg/L. Nitrification/denitrification appears to be occurring; however, a control will be started to verify this.
  Day 3: Added 2 more grams of Oasis soap to raise ammonia and nitrate level.
  Day 5: Took readings: pH 7.8, NH3 >6 mg/L, NO2 0mg/L, NO3 10 mg/L.
  Conclusion of Test: Denitrification appears to be occurring; however, there is no nitrification at this time, probably due to inadequate aeration by the stir bar.
• Fixed the mode button on the Oregon Scientific clock and reset the time. Also mounted the device to the right of the southern window on the second level.

Open Issues:

• Electrical Diagram of the Greenhab: CLOSED
  Status: The power flow diagram for the Greenhab has been completed and uploaded as a GIF file (note: JPG file did not come out well).
  
  
• TST work - Float Switch
  Action: Install a new float switch per instructions upon locating a DC float switch. Received notice from Mission Support that the silver float switch, even though it is labeled AC, would work. Unfortunately, we could not locate that float switch, and only have the black AC float switch.
• 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.
  
  
• Treatment system appears not to be removing nitrate.
  Status: Innoculated trickling filter #2 with more bacterial solids the from 110 gallon tank. 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.
  
  
• Treatment system removal efficiency of carbonaceous oxygen demand
  Status: There are COD vials here at the Hab, but no spectrophotometer. Therefore, I do not know the removal efficiency of the system.