Effects of Biogas Residue on Plant Growth and Biochemical Properties of Lead-Zinc Smelting Slag

QIU Jing; WU Yonggui; LUO Youfa; LONG En

doi:10.13870/j.cnki.stbcxb.2019.03.050

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Effects of Biogas Residue on Plant Growth and Biochemical Properties of Lead-Zinc Smelting Slag

更新时间：2025-03-12

- Effects of Biogas Residue on Plant Growth and Biochemical Properties of Lead-Zinc Smelting Slag
- Vol. 33, Issue 3, Pages: 340-347(2019)
- 作者机构：
  
  1. 贵州大学资源与环境工程学院,贵阳,550025
  2. 贵州大学应用生态研究所,贵阳,550025
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2019.03.050
  CLC：
- Published：2019
- 稿件说明：
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QIU Jing, WU Yonggui, LUO Youfa, et al. Effects of Biogas Residue on Plant Growth and Biochemical Properties of Lead-Zinc Smelting Slag[J]. 2019, 33(3): 340-347.
DOI：

QIU Jing, WU Yonggui, LUO Youfa, et al. Effects of Biogas Residue on Plant Growth and Biochemical Properties of Lead-Zinc Smelting Slag[J]. 2019, 33(3): 340-347. DOI： 10.13870/j.cnki.stbcxb.2019.03.050.

摘要

为研究沼渣作为改良剂对铅锌冶炼废渣环境条件的改善及修复植物生长的影响，采用盆栽试验研究不同比例（0，1%，3%，5%，7%，9%）沼渣添加和黑麦草（Lolium perenne L.）生长对废渣养分含量、微生物学特性、重金属赋存形态及黑麦草的生物学特征的综合影响。结果表明：与对照废渣相比，添加沼渣后废渣养分（N、P、K）、有机质、酶活性（碱性磷酸酶、蔗糖酶、脲酶、过氧化氢酶）、微生物数量（细菌、真菌和放线菌）以及微生物活性（呼吸强度）均显著（p<0.05）增加）不同比例沼渣添加均显著增加黑麦草鲜重、根长、株高并显著降低植物组织（地上和地下部）中重金属含量（p<0.05）。沼渣添加和黑麦草生长通过促进废渣中酸溶态重金属（Cu、Cd、Zn、Pb）向残渣态转化进而降低废渣中重金属的生物有效性。典范对应分析表明，沼渣施用量在5%，7%，9%时对废渣微环境条件改善作用较大，其中，较低的沼渣添加量（5%）就能显著改善废渣的微环境条件及促进修复植物健康生长。因此，综合考虑沼渣作为有机改良剂的最佳费用和效应间的关系，在设置试验条件下，可将5%的沼渣添加量作为铅锌冶炼废渣有机改良及植物修复的最佳施用比例。

Abstract

A pot experiment was conducted to evaluate the effects of different proportions of biogas residue (BR) on growth of ryegrass (Lolium perenne L.) and physico-chemical properties of lead-zinc smelting slag. BR was incorporated into slag at rates of 0

7% and 9%

respectively. The comprehensive effects of biogas residue on nutrient content

microbiological characteristics

forms of heavy metals of lead-zinc smelting slag and biological characteristics of ryegrass were studied. The results showed that addition of BR improved slags properties and thus facilitated growth of ryegrass. Compared with the control

BR application significantly increased nutrients (nitrogen

phosphorus and potassium)

organic matter

enzyme activity (alkaline phosphatase

invertase

urease and catalase)

the number of microbes (bacteria

fungi and actinomycetes) and microbial activity (respiratory intensity) (p<0.05). Different proportions of BR also significantly enhanced the total fresh weight

root length and plant height of ryegrass and significantly reduced the heavy metal content of plant tissues (the ground and underground part) (p<0.05). BR addition and ryegrass growth promoted the transformation of acid-extractable state of heavy metals (Cu

Zn and Pb) into the residual state

and then decreased the bioavailability of heavy metals in slag. Canonical correspondence analysis (CCA) revealed that the application amount of BR at 5%

7% and 9% effectively improved the micro-environmental conditions of slag

among which

the lower addition amount of BR (5%) could also significantly improve the micro-environmental conditions of slag and promote the healthy growth of plants for restoration. Therefore

considering the relationship between the cost and effects caused by BR

the 5% addition amount of biogas residue could be used as the optimal application ratio for the improvement and phytoremediation of lead-zinc smelting slag.

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