학술논문
广西城镇污水厂脱水污泥重金属形态分布特征 / Distribution characteristics of heavy metals in dewatered sludge from sewage treatment plants of town in Guangxi
Document Type
Academic Journal
Author
Source
广西大学学报（自然科学版） / Journal of Guangxi University (Natural Science Edition). 41(3):896-902
Subject
Language
Chinese
ISSN
1001-7445
Abstract
为了实现污泥的稳定化、无害化和资源化,对广西城镇污水处理厂脱水污泥的基本理化性质和污泥中重金属总量和形态分布特征进行了研究分析。分析结果表明,广西城镇污水处理厂的污泥均呈酸性,pH值在6.05~6.35,总氮含量的平均值为49.74 g/kg,总磷含量的平均值为10.72 g/kg,有较好的农用价值。脱水污泥中重金属 As、Cd、Cr、Cu、Ni、Pb、Zn 的含量分别为26.31~28.83,1.39~3.77,47.01~87.37,78.07~135.28,32.18~42.22,25.79~44.40,320.86~363.72 mg/kg,均满足CJ/T 309-2009《城镇污水处理厂污泥处置农用泥质标准》中的B级标准,可施用于相应农作物。其中,Zn、Ni的形态主要集中在迁移性较强的可交换态、可还原态范围内,极易被生物利用,不稳定；Pb主要集中在可还原态,Cu主要集中在可还原态、可氧化态范围内,它们迁移性较弱,可被生物间接利用,较为稳定；Cr主要集中在残渣态、可氧化态范围内,迁移性最弱,不易被生物吸收利用,最稳定；而As和Cd的形态分布比较均匀。
The basic physical and chemical properties and the total amount of heavy metals, as well as the distribution characteristics of heavy metals in dewatered sludge from the sewage treatment plants of towns in Guangxi were investigated. The results showed that the sludge was acidic. The pH values were between 6. 05 and 6. 35. The average value of total nitrogen content was 49. 74 g/kg, and the average value of total phosphorus was 10. 72 g/kg, indicating that the sludge was rich in nu-trients and had a promosing application prospects in agriculture. The contents of the heavy metals in the sludge, including As, Cd, Cr, Cu, Ni, Pb and Zn, were between 26. 31 ~28. 83 mg/kg, 1. 39~3. 77 mg/kg, 78. 07~135. 28 mg/kg, 32. 18~42. 22 mg/kg, 25. 79~44. 40 mg/kg, and 320. 86~363. 72 mg/kg respectively, which met the requirement of Disposal of Sludge from Munici-pal Wastewater Treatment Plant-Control Standards for Agricultural Use ( CJ/T 309-2009 ) of China for B grade sludge, and could be used in relevant crops. The predominant form of Zn and Ni were exchangeable speciation and reducible speciation, which were unstable and could be bioabsorbable easily. Pb existed mainly as reducible speciation, while Cu existed mainly as both reducible specia-tion and oxidizable speciation, which were more stable relatively, and could not be bioabsorbable di-rectly. Cr existed mainly as residual speciation and oxidizable speciation, which were the most sta-ble, and could not be bioabsorbable easily. Besides, the distribution characteristics of as and Cd were uniform relatively.
The basic physical and chemical properties and the total amount of heavy metals, as well as the distribution characteristics of heavy metals in dewatered sludge from the sewage treatment plants of towns in Guangxi were investigated. The results showed that the sludge was acidic. The pH values were between 6. 05 and 6. 35. The average value of total nitrogen content was 49. 74 g/kg, and the average value of total phosphorus was 10. 72 g/kg, indicating that the sludge was rich in nu-trients and had a promosing application prospects in agriculture. The contents of the heavy metals in the sludge, including As, Cd, Cr, Cu, Ni, Pb and Zn, were between 26. 31 ~28. 83 mg/kg, 1. 39~3. 77 mg/kg, 78. 07~135. 28 mg/kg, 32. 18~42. 22 mg/kg, 25. 79~44. 40 mg/kg, and 320. 86~363. 72 mg/kg respectively, which met the requirement of Disposal of Sludge from Munici-pal Wastewater Treatment Plant-Control Standards for Agricultural Use ( CJ/T 309-2009 ) of China for B grade sludge, and could be used in relevant crops. The predominant form of Zn and Ni were exchangeable speciation and reducible speciation, which were unstable and could be bioabsorbable easily. Pb existed mainly as reducible speciation, while Cu existed mainly as both reducible specia-tion and oxidizable speciation, which were more stable relatively, and could not be bioabsorbable di-rectly. Cr existed mainly as residual speciation and oxidizable speciation, which were the most sta-ble, and could not be bioabsorbable easily. Besides, the distribution characteristics of as and Cd were uniform relatively.