Changes in fractions of Cu and Zn in initial and final anaerobic co-digestion of pig manure and maize straw in different ratios

doi:10.7523/j.issn.2095-6134.2013.05.022

Abstract

Abstract:

A 50-day anaerobic digestion test is conducted by mixing raw pig manure with maize straw at dry matter mass ratios of 1:1 and 2:1 at the temperature of (35±1) ℃. The fractions of Cu and Zn of the co-digestion fermentation materials and the biogas residues are measured by modified BCR extraction and 0.01 mol·L^-1 CaCl₂ extraction processes, respectively. The results showed that the concentrations of leachable fraction and the percentages of bioavailability (sum percentages of exchangeable and reducible fractions) of Cu and Zn all decreased in biogas residues, and the stability (sum percentages of oxidizable and residual fractions) of Cu and Zn all increased in biogas residues during anaerobic co-digestion.

Key words: anaerobic co-digestion, modified BCR extraction, 0.01 mol·, L^-1 CaCl₂ extraction, heavy metal fractions

CLC Number:

O610

BAI Fan, CHEN Miao, CUI Yan-Shan. Changes in fractions of Cu and Zn in initial and final anaerobic co-digestion of pig manure and maize straw in different ratios[J]. , 2013, 30(5): 713-719.

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