Nitrogen and phosphorus removal for swine wastewater by ammonium crystallization and intermittent aeration process.
A process on crystallized precipitation of ammonium by adding magnesium salt and phosphate was carried out to improve C/N ratio in swine wastewater. After completion of crystallized precipitation of ammonium, an intermittent aeration process with aeration and nonaeration periods alternated at interval of 1:1 hr day-1 is used for the improved swine wastewater (T-N/BOD = 0.14: BOD = 8200 mg/liter and T-N = 1166 mg/liter). The results obtained from the experiment show that the removal ratios of T-N and NH4-N are 91% and 99%, respectively. T-P is not removed, while the removal ratio of PO4-P is 60% as 3% of CaCl2 liquid is added. The results also indicate that dilution with water is effective to improve the removal of phosphorus even if raw swine wastewater contains high concentrations of T-N, T-P, BOD, and TOC.
Department of Agricultural Engineering, National Taiwan University, Taipei, R.O.C.
C M
CM
Liao
T
T
Maekawa
X D
XD
Feng
D000641:Ammonia / Q000302:isolation & purification*; D000822:Animal Husbandry / Q000592:standards; D000818:Animals; D011232:Chemical Precipitation; D003460:Crystallization; D008274:Magnesium; D010710:Phosphates; D013552:Swine; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*
D010710:Phosphates; D000641:Ammonia; D008274:Magnesium