本文選題：豬糞 + 重金屬　； 參考：《農(nóng)業(yè)環(huán)境科學(xué)學(xué)報》2017年10期

【摘要】：為了解有機酸對豬糞中重金屬的去除效果,以天津某畜禽養(yǎng)殖場豬糞為研究對象,利用化學(xué)浸提法,考察了檸檬酸、草酸、酒石酸和蘋果酸四種有機酸對去除豬糞中重金屬Cu、Zn和Mn的影響,確定了最佳有機酸種類和運行條件,并分析了有機酸的浸提成本和后續(xù)豬糞的農(nóng)用性能。結(jié)果表明,檸檬酸和草酸對重金屬的去除效果較好,在最佳條件下,檸檬酸對重金屬Cu、Zn和Mn的去除率分別為57.90%、73.76%、79.56%,草酸對重金屬的去除率分別為62.72%、59.39%、40.04%。有機酸以去除有機結(jié)合態(tài)Cu為主,而碳酸鹽結(jié)合態(tài)、鐵錳氧化物結(jié)合態(tài)和有機結(jié)合態(tài)的Zn、Mn重金屬濃度都顯著降低。重金屬去除成本隨固液比的降低而升高,固液比為1∶5時,檸檬酸和草酸對重金屬的處理成本分別為126.07、384.24元·t~(-1)。浸提后豬糞中有機質(zhì)、氮、磷、鉀含量分別約為815.80、17.61、5.49、0.36 g·kg~(-1)。研究表明,檸檬酸和草酸浸提能較為有效地去除豬糞中的重金屬,且浸提后的豬糞仍具有較高的營養(yǎng)價值和肥力。
[Abstract]:In order to understand the effect of organic acid on the removal of heavy metals in pig manure, citric acid and oxalic acid were investigated by chemical extraction method. The effects of tartaric acid and malic acid on the removal of Cu Zn and mn from pig manure were studied. The optimum organic acid types and operating conditions were determined. The extraction cost of organic acid and the agricultural performance of subsequent pig manure were analyzed. The results showed that citric acid and oxalic acid had better removal efficiency for heavy metals. Under the optimum conditions, the removal rates of Cu Zn and mn in citric acid were 57.900.73.76 and 79.56, respectively. The removal rates of oxalic acid for heavy metals were 62.72 and 59.390.44, respectively. Organic acids mainly remove organic-bound Cu, while the concentrations of heavy metals in carbonate bound, iron-manganese oxide bound and organic-bound Zn ~ (2 +) O _ (2 +) are significantly decreased. The cost of heavy metal removal increased with the decrease of solid-liquid ratio. When the ratio of solid to liquid was 1:5, the cost of treatment of heavy metals by citric acid and oxalic acid was 126.07384.24 yuan / t ~ (-1), respectively. After extraction, the contents of organic matter, nitrogen, phosphorus and potassium in pig dung were about 815.80 ~ 17.61g / kg ~ (-1) and 0.36g / kg ~ (-1), respectively. The results showed that the extraction of citric acid and oxalic acid could effectively remove heavy metals from pig manure, and the extracted pig manure still had high nutritional value and fertility.
【作者單位】： 南開大學(xué)環(huán)境科學(xué)與工程學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃項目(2016YFD0801002-01) 天津市科技支撐計劃項目(201601190)~~
【分類號】：X713

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