Simultaneously Recovery of Phosphorus and Potassium Using Bubble Column Reactor as Struvite-K and Implementation on Crop Growth

Mapping Intimacies ◽

10.5772/intechopen.100103 ◽

2021 ◽

Author(s):

Endar Hidayat ◽

Hiroyuki Harada

Keyword(s):

Size Structure ◽

Positive Impact ◽

Bubble Column ◽

Removal Rate ◽

Crop Growth ◽

The Other ◽

Bubble Column Reactor ◽

Column Reactor ◽

Coffee Husk ◽

Phosphorus And Potassium

Struvite-K, similar to NH4-struvite with a composition of Mg:K:P (1:1:1). It is called struvite-K because the K replaces the NH4 in struvite. The composition usually used as fertilizer and can be recycling from wastewater including livestock wastewaters. In addition, Struvite-K which tends to form scale on surfaces of equipment which problem in many industries. The present study was used bubble column reactor which simple and efficient. In addition, the process can be implementation in wastewater industry which low-tech processes. Then, the struvite-K precipitate was implementation on crop growth which compared with coffee husk compost. The results show the removal of P via struvite-K showed 98.5% with the precipitation Mg:P of 0.7 and K:P of 1 with yields of 11.28 gram. Increases of magnesium dosage which decreases of P removal rate and affected of crystal size structure. Compost and struvite-K have similar positive impact on crop growth of (radish and komatsuna) were compared than control. In the other hand, the struvite-K is more effective than compost. This might be indicated that struvite-K is more slow-release nutrient than compost and higher macro nutrient supplied on soil which crop needed.

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Ozonation of domestic secondary effluent for recycling and reuse - a pilot plant study

Water Science & Technology ◽

10.2166/wst.2002.0625 ◽

2002 ◽

Vol 46 (4-5) ◽

pp. 361-366 ◽

Cited By ~ 4

Author(s):

C.H. Ni ◽

J.N. Chen ◽

Y.C. Tsai ◽

W.B. Chen ◽

C.H. Chen

Keyword(s):

Pilot Plant ◽

Gas Flow ◽

Bubble Column ◽

Removal Rate ◽

Ozone Treatment ◽

Bubble Column Reactor ◽

Secondary Effluent ◽

Sand Filtration ◽

Recycled Water ◽

Column Reactor

In this study, a pilot plant combined ozonation with sand filtration is established. Wastewater from the secondary effluent was taken as the sample for looking into the feasibility of domestic wastewater recovery and recycling. At the beginning, a series of hydraulic analysis and ozone transfer tests was conducted in the bubble column reactor. From these tests, it was found that when the gas flow is controlled to within 0.2∼1.0 L/min and liquid flow within 0.5∼2.5L/min, using series connected mixing tank model for our calculation, the result J (CSTR) is 1∼2. From the ozone transfer test it is known that the smaller the gas flow, the better the transfer rate, and the same pattern occurs on ozone gas concentration. After sand filtration and ozone treatment, the G/L ratio within the ozone column reactor can be maintained within 0.2∼0.4 and the ozone dosage within 8∼12 mg/L. The removal rate for coliform bacillus, BOD, turbidity and color is 99.96%, 62.2%, 89.6% and 67% respectively. After ozonation treatment, coliform bacillus content can be controlled under 10 CFU/mL, BOD under 10mg/L, turbidity within 2.0∼2.5 (NTU), and color within 10.3∼13.7 degree. The recycled water is almost colorless and odorless, and is capable of reaching the reference standard for recycled water.

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