Team:Nanjing-China/Hardware
Hardware
Overview
In order to achieve automation and integration, we design a hardware called BWR(bio-wastewater reaction). Intuitively, phosphorus-containing wastewater flow through BWR can be converted into phosphorus-free water, and Struvite is generated. The two main parts of the hardware is reaction tank and settlement tank.
Engineered bacteria and MBR biofilm reactor is put in the reaction tank. Phosphorus-containing wastewater is pumped into the reaction tank, where engineered bacteria absorbing phosphorus, Pi-free water can be extract while phosphorous and engineered bacteria intercepted in the reaction tank by the MBR biofilm reactor. The bacteria sluge will be discharged into the release tank after absorbing enough phosphorus to release phosphorus into the water, thus phosphorus solution is concentrated. Struvite precipitation can be generated by mixing the phosphorus solution, high-ammonia nitrogen wastewater and magnesium ion in the sedimentation tank.
Planform
A：Electrical control element
B：Core phosphorus removal chamber
C：Clear water basin(The equipment room is under the clear water basin)
D：Desilter
E：Dosing chamber
F：Phosphorous releasing room (not necessarily available, experimental exploration is required)
Front View
Left View
The back of the front view
A：Electrical control element
B：Core phosphorus removal chamber
C：Clear water basin(The equipment room is under the clear water basin)
D：Desilter
E：Dosing chamber
F：Phosphorous releasing room (not necessarily available, experimental exploration is required)
Core phosphorus removal chamber
The overflow hole
Floating ball valve
Aerator pipe
Straws
The MBR membrane
Phosphorus wastewater will enter the chamber by gravity overflow, and the side is connected with two float valves with two water levels of high and low. On a normal basis, the water level is between the two float valves. If water level is too low, then low water level float valve falls( As shown in the photo, no water is added and the valve is in the state of fallen), and the low-water light on display panel will light up . On the other hand, if water level is too high, then high water level float valve floats and the high-water level light on display panel will be on. We can monitor the water level according to the panel.
The engineering stain CPP will be released to remove phosphorus in large quantities without requiring an anaerobic environment. There is a membrane assembly in the center of the reaction chamber, including 10 MBR biofilms with an aperture of 0.1um, as well as aeration facilities. Bacteria can be trapped in the reaction chamber by a membrane, so that the effluent is phosphorus-free and sterile. Air passes through the air pipe to reach the bottom of the membrane fixer, and gives out air through the evenly distributed air outlet. Air bubbles, large and small, have a direct scour effect on the membrane, which can deal with the membrane pollution caused by bacterial adsorption.
The phosphorus-free water after bacterial treatment will be pumped to the clean pool next door. After the reaction in the phosphorus removal chamber, turn off the aeration, and the bacteria will settle down slowly. After opening the valve of the mud discharge pipe, the bacteria solution can be transferred to the release tank or sedimentation tank by gravity (whether the release is needed is determined after the experiment).
Equipments
Desilter
After open the valve, bacterium solution flows into the desilter by gravity. To meet the alkaline environment struvite precipitation reactions require , we add the agent as well as Mg ion above the desilter. What's more, desilter is also equipped with air blower, to mix the whole system by aeration blending. The conical area below is the final precipitation area. The supernatant (relatively, probably not very clear) can be discharged through the drainage hole.
Electrical control element
The part of electronic control is complicated and well-designed. Switch buttons: the first three buttons in the first row are indicator lights. From left to right, they are fan state, dosing state and self-priming state respectively. When the equipment turns on, the light is on. At the end of the first row is a knob.There are three states, manual/stop/automatic, connected with infrared remote control. The first three of the second and third rows are start and stop buttons. The last two indicators represent high water level and low water level respectively, corresponding to the two float valves in the phosphorus removal chamber.
