To investigate the influence of organic matter on the crystalliza-tion of struvite, three kinds of organic matter, including acetic acid,sodium alginate and bovine albumin were chosen. Moreover, in theexperiments, simulated swine wastewater with the same concen-trations of TAN and PTto the actual swine wastewater was preparedby dissolving NH4Cl and Na2HPO4·12H2O into pure water. Thespecified procedures of the experiments are described as follows:(1) 100 ml simulated wastewater was added to a 200 ml jar with anairtight lid, which was placed on a magnetic stirrer; (2) the desiredamount of organic matter was fed to the wastewater for preparingdifferent concentrations of organic matter (0–1000 mg/L), followedby 10 min rapid mixing to dissolve the organic matter; (3) exter-nal MgCl2·6H2O and Na2HPO4·12H2O were added to the mixedwastewater at the Mg:N:P molar ratio of 1:1:1; (4) the mixed solu-tion was stirred for 30 min at pH 9, and then was precipitated for30 min; (5) 5 ml of the supernatant was taken and filtered througha 0.45 m filter membrane for the composition analysis.