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  • iAVs Shanghai China

    Hi everyone. My name is Shawn Wang. I'm working with Gary to widely spread iAVs knowledge in China. I'm a newcomer and just made a simple design. Please let me know if anything can be improved. Thank you.

    Attached are photos of rear view, top view and bottom view of the design. Total fish tanks volume is 10,000 L, divided into 4 tanks for staggered production. Tanks have a 45 degree slope and bottom drain pipe to overflow to the small tank in the middle, where water pump is located. There are 5 biofilters with total volume around 20,000 L, 4 of them with size 11.5*0.9*0.4m, and 1 of 11.5*0.6*0.4m. Distance between plants will be 50-60cms. Walk paths are 30cm wide between biofilters.





    The system will be within a double layer plastic films greenhouse. Shanghai is in temperate zone. Temperature will be controlled in summer with fan and pad. Typically air temperature should not go over 35 degrees, and water temperature within 27 in summer. In winter, temperature control is limited or non-exist, and water temperature will drop to 10 degrees at lowest. Air temperature within greenhouse usually stays above 0 degree during winter nights, and around 15 in daytime.

    Local carps will be stocked as they will still eat at 10 degrees and provide some nutrients in winter, and fingerlings are available all seasons. Designed final stocking density is 20kg/m3, and harvest size will be 500g each. 100 fishs, from fingerlings to 300g sizes, will be stocked in each fish tank initially. Fishes will be harvest and restocked every 3 months.

    I have a few question I did not find answers in the publications. Please help. Thanks.

    Is it a good idea to use ozone to sterilize sand before use?
    Is 40cm a good height for biofilter? I read the publications and found 30 & 50cm high biofiters had been used.
    How deep and wide should the furrows be?

  • #2
    Anyone can hep with furrow and water level design? Which one is recommended? Thanks.

    Comment


    • #3
      Hi Shawn...welcome aboard. I'm pleased that you returned to China safetly following your recent visit to Australia...and I'm excited at the prospect of working with you to pursue the realisation of iAVs destiny in China.

      Originally posted by Shawn View Post
      Attached are photos of rear view, top view and bottom view of the design. Total fish tanks volume is 10,000 L, divided into 4 tanks for staggered production. Tanks have a 45 degree slope and bottom drain pipe to overflow to the small tank in the middle, where water pump is located. There are 5 biofilters with total volume around 20,000 L, 4 of them with size 11.5*0.9*0.4m, and 1 of 11.5*0.6*0.4m. Distance between plants will be 50-60cms. Walk paths are 30cm wide between biofilters.
      Your first iAVs effort is an ambitious one but, one that I'm confident, will provide you with a great demonstration of the capability of the iAVs method.

      Each of the four biofilters is 11.5 metres long x 0.9 metres wide x 0.4m deep...for a total growing area of 10.35 m2...and a volume of 4.14m3 - or 4140 litres.

      Each fish tank has a volume of 2500 litres...for a total of 10,000 litres. The fish tank/sand biofilter ratio of each of the four larger sub-systems is 1:1.65.

      The 6m by 0.9m growbed has a growing area of 5.4m2...volume of 2.16 cubic metres...or 2160 litres.

      Shawn, I'd recommend that you use four smaller pumps....one in each tank. This will ensure more consistent removal of the solids and save you the cost of the extra tank. Pump directly from the fish tank up into the sand biofilter. You want all of the solids from the fish in a particular tank to go onto the corresponding grow bed.

      With four discrete units, you have the basis for comparison and this will be very important as you set out to discover what species and cultivars are best for your environment.

      You might like to consider using the space intended for the fifth smaller system to increase the pathways between the other four beds....300mm may be too little for the people who have to seed, plant, trellis and harvest within the system.

      Is it a good idea to use ozone to sterilize sand before use?
      The sand would only need sterilisation if it is known to be problematic. If the sand is manufactured quartz silica sand there is no issue because it won't have come in contact with plant diseases.

      Is 40cm a good height for biofilter? I read the publications and found 30 & 50cm high biofiters had been used.
      400mm is good.

      How deep and wide should the furrows be?
      The depth and width of the furrows is driven largely by the plants being grown. Remember, the purpose of the furrows is to keep the plant crowns dry while facilitating even distribution of the water across the sand bed.
      "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

      www.garydonaldson.net - my main website.

      https://www.facebook.com/gary.donaldson.161 - my Facebook page.

      https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

      https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

      www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

      Comment


      • #4
        Originally posted by Shawn View Post
        Anyone can hep with furrow and water level design? Which one is recommended? Thanks.
        The attached photos illustrate iAVs furrows.

        UNADJUSTEDNONRAW_thumb_12c23.jpgUNADJUSTEDNONRAW_thumb_12c88.jpgUNADJUSTEDNONRAW_thumb_12c92.jpg
        Attached Files
        "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

        www.garydonaldson.net - my main website.

        https://www.facebook.com/gary.donaldson.161 - my Facebook page.

        https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

        https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

        www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

        Comment


        • #5
          Thank you Gary. Very helpful informations. You are right about the fish tanks. I'll take your advice and use 4 pumps for 4 isolated fish tanks. I'm looking for cheaper inert washed builders' sand. Price for quartz silica sand has gone up too much in China since it became popular for decoration and water treatment. In old times, it's almost free. Does builders' sand need sterilization? Thanks.

          Comment


          • #6
            I'm thinking to use recycled ceramics. There are some companies recycle defect china or ceramic products and crush them into small particles to reuse. There are also volcanic stone sands available. They are usually inert, but volcanic sand may not be very strong.

            Comment


            • #7
              Attached are two photos of likely suitable sand. The yellowish sand is crushed and washed quartz sand. Price range within 280-400 Chinese dollars (around 55-80 Australian dollars) per ton including shipping. The other one is washed river sand, which costs about the same. They are too expensive largely due to shipping fees. I'm still looking for suitable sand from local suppliers.

              Comment


              • #8
                Originally posted by Gary Donaldson View Post

                The attached photos illustrate iAVs furrows.
                Gary, is it better to use natural quartz sand (washed river sand) or crushed quartz sand? The natural one is rounder, and may be harder to maintain the ridge? While the crushed ones have sharp edges and may stacks better.

                Comment


                • #9
                  My preference would be for the crushed quartz sand. The most important issue, however, is the particle size range.
                  "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

                  www.garydonaldson.net - my main website.

                  https://www.facebook.com/gary.donaldson.161 - my Facebook page.

                  https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

                  https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

                  www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

                  Comment


                  • #10
                    Originally posted by Gary Donaldson View Post
                    My preference would be for the crushed quartz sand. The most important issue, however, is the particle size range.
                    0.5-1mm and 1-2mm sizes are available. Do you think it's better to use 1-2mm only or mix some 0.5-1mm size sand too? Thanks.

                    Comment


                    • #11
                      Originally posted by Shawn View Post

                      0.5-1mm and 1-2mm sizes are available. Do you think it's better to use 1-2mm only or mix some 0.5-1mm size sand too? Thanks.
                      You can mix some of both types together. Look at the particle size range table in my last post for guidance. The important thing is that there should be a mininum of fine material (> 0.5mm).
                      "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

                      www.garydonaldson.net - my main website.

                      https://www.facebook.com/gary.donaldson.161 - my Facebook page.

                      https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

                      https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

                      www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

                      Comment


                      • #12
                        Originally posted by Gary Donaldson View Post

                        You can mix some of both types together. Look at the particle size range table in my last post for guidance. The important thing is that there should be a mininum of fine material (> -.5mm).
                        Medium
                        0.25 to 0.5mm
                        20 +/- 10
                        Gary, is it necessary to have at least 10% Medium sand? Thanks.

                        Comment


                        • #13
                          Samples of washed builders' sand

                          Comment


                          • #14
                            Originally posted by Shawn View Post
                            Medium
                            0.25 to 0.5mm
                            20 +/- 10
                            Gary, is it necessary to have at least 10% Medium sand? Thanks.
                            Shawn, you can have less.
                            "All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident." - Arthur Schopenhauer

                            www.garydonaldson.net - my main website.

                            https://www.facebook.com/gary.donaldson.161 - my Facebook page.

                            https://www.facebook.com/groups/1167267703372756/ - my Microponics and Waste Transformation Farming Facebook Group

                            https://www.facebook.com/groups/1318946951452383/ - my iAVs Facebook Group

                            www.urbanaquaponics.com.au - the current home of the Online Urban Aquaponics Manual.

                            Comment


                            • #15
                              Originally posted by Gary Donaldson View Post

                              Shawn, you can have less.
                              Thank you Gary. I have another question. How is outlet of sand beds structured for effective draining while preventing loss of sand? Thanks.

                              Comment

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