关键词: 晚稻, 晚稻, 施氮量, 栽插密度, 穗颈瘟

Abstract: The heavy metals such as Cu2+, Zn2+, Cd2+ and Pb2+ in the livestock manure from one farm in Yong’ an Town, Liuyang City were treated with the electrochemical method of graphite as anode and stainless steel plate as cathode. The effects of electrolytic voltage and electrolytic time on pH value and heavy metals (Cu2+, Zn2+, Cd2+ and Pb2+) of livestock manure were studied. Moreover, the cost of energy consumption for removal heavy metals from livestock manure was calculated. The results showed that the pH value of manure in the anode region decreased, while it in the cathode region increased. The sum of the pH values of the cathode and the anode area was 14 under reaction stability condition. In different regions of the reactor, the removal effect of different heavy metals was different; in particular, the removal effect of heavy metals among the anode region was the best. Under the initial concentration of the sample 90 g/L, pH 6.82, voltage 40 V, and the reaction time 4 h, the removal of heavy metals from livestock manure reached the optimal balance between effect and cost. The removal percentage of Cu2+, Zn2+, Cd2+ and Pb2+ from livestock manure was 62.32%, 79.78%, 55.37%, and 58.56%, respectively. In this case, the cost of treating 1 m3 of manure was RMB 10.75.