日本語AIでPubMedを検索
木蝨とミミズの相乗的相互作用による下水汚泥の重金属の浄化と施肥能の向上
Remediation of heavy metals and enhancement of fertilizing potential of a sewage sludge by the synergistic interaction of woodlice and earthworms.
PMID: 31761649 DOI: 10.1016/j.jhazmat.2019.121573.
抄録
下水汚泥の堆肥化において、木蝨とミミズの単独または併用により、物性の改善、栄養分の放出、重金属の安定化を図った。生汚泥(IS)の化学的性質を堆肥化汚泥(CS)、汚泥+ミミズ(VS)、汚泥+木蝨(WS)、汚泥+ミミズ+木蝨(VWS)の50日後および100日後の化学的性質を比較した。堆肥化100日後の物性と重金属蓄積量を測定した。その結果、VWS処理群では微粒子の割合、空隙率、保水力が最も高く、電気伝導率、灰分、無機N、P、K、Ca、Mgの濃度が増加したが、pH値、有機C、C:N比、腐植酸の含有量は以下の順に減少した。VWS>VC>WS>CS>ISの順に減少した。堆肥化汚泥中のPb, Cd, Niの総濃度は低いが、Zn, Cu, Mnの総濃度は生汚泥に比べて高く、木虱は全ての処理においてミミズに比べて高い生物濃縮係数(BCFs)を示した。これらの結果から，木蝨とミミズが相乗的に堆肥の物理化学的特性を改善し，農業用土壌の改良材としての利用の可能性を高めていることが示唆された．
Woodlice and the earthworm alone or in combination were used to improve physical properties, nutrient release, and heavy metals stabilization during composting of sewage sludge. Chemical properties of raw sludge (IS) were compared to those of composted sludge (CS), sludge + earthworms (VS), sludge + woodlice (WS), and sludge + earthworms + woodlice (VWS) after 50 and 100 days of composting. Physical properties and heavy metals accumulation by the studied fauna was determined after 100 days of composting. Highest proportions of fine particles, porosity and water holding capacity were in the VWS treatment, electrical conductivity, ash content, inorganic N and the total concentrations of P, K, Ca and Mg increased, whereas the pH value, the organic C, C:N ratio and humic acids content decreased in following order: VWS > VC > WS > CS > IS. Total concentrations of Pb, Cd and Ni in composted sludge were lower whereas concentrations of Zn, Cu and Mn were higher than in raw sludge, and woodlice showed higher bioconcentration factor (BCFs) than earthworm for all heavy metals in all treatments. We concluded that woodlice and earthworms synergistically improved the physicochemical properties of the compost and enhanced its potential use as amendment in agricultural soils.
Copyright © 2019 Elsevier B.V. All rights reserved.