人工濕地處理剩余污泥工藝
發(fā)布時(shí)間:2018-11-25 21:32
【摘要】:通過8個(gè)月的人工濕地模擬實(shí)驗(yàn),研究了3組工藝的人工濕地對(duì)剩余污泥滲濾液的凈化效果,以及對(duì)積存污泥的穩(wěn)定化效果,同時(shí)還通過濕地植物體內(nèi)重金屬的分布特征來研究植物對(duì)重金屬富集的差異性.Ⅰ單元種植蘆葦,基質(zhì)反級(jí)配;Ⅱ單元種植蘆葦,基質(zhì)正級(jí)配;Ⅲ單元種植美人蕉,基質(zhì)正級(jí)配.實(shí)驗(yàn)結(jié)果表明,在每個(gè)7 d的周期內(nèi)隨著停留時(shí)間的增長(zhǎng)污泥含水率和揮發(fā)性固體呈下降趨勢(shì),3組污泥脫水后平均含水率為55.06%,揮發(fā)性固體去除率達(dá)55.7%;不同類型的植物對(duì)積存污泥的礦化程度不同,蘆葦要優(yōu)于美人蕉;3個(gè)單元滲濾液出水的p H值變化趨勢(shì)大致相同,無明顯差異;滲濾液出水的有機(jī)質(zhì)含量均較進(jìn)泥低,種植美人蕉單元去除效果最好;根據(jù)數(shù)據(jù)分析,3個(gè)單元中都發(fā)生了氨化、硝化和反硝化作用,Ⅲ單元總氮去除率最高70.21%,Ⅱ單元和Ⅰ單元分別為67.34%和66.67%.蘆葦和美人蕉植物體對(duì)Ni的吸收量分別為4.62 mg·kg~(-1)、5.28 mg·kg~(-1),Cu分別為25.38 mg·kg~(-1)、25.12 mg·kg~(-1),Cr分別為7.87 mg·kg~(-1)、7.19 mg·kg~(-1),Pb分別為5.03 mg·kg~(-1)、5.87 mg·kg~(-1),Zn分別為151.12 mg·kg~(-1)、141.30 mg·kg~(-1),不同濕地植物在人工濕地中吸收積累重金屬的量存在差異性.系統(tǒng)表層未出現(xiàn)雍水現(xiàn)象,處理后污泥的胞外聚合物(EPS)含量較低,蛋白質(zhì)平均為1.03 mg·g~(-1)、1.10 mg·g~(-1)、1.16 mg·g~(-1),多糖平均為0.42 mg·g~(-1)、0.36 mg·g~(-1)、0.42 mg·g~(-1).結(jié)果說明垂直流人工濕地系統(tǒng)對(duì)剩余污泥有較好的脫水和穩(wěn)定化效果.
[Abstract]:Through the simulation experiment of constructed wetland for 8 months, the purification effect and stabilization effect of three groups of constructed wetland on excess sludge leachate were studied. At the same time, the distribution characteristics of heavy metals in wetland plants were studied to study the differences of heavy metal enrichment in plants. Unit 鈪,
本文編號(hào):2357434
[Abstract]:Through the simulation experiment of constructed wetland for 8 months, the purification effect and stabilization effect of three groups of constructed wetland on excess sludge leachate were studied. At the same time, the distribution characteristics of heavy metals in wetland plants were studied to study the differences of heavy metal enrichment in plants. Unit 鈪,
本文編號(hào):2357434
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