Food and Fermentation Industries >

2021 , Vol. 47 >Issue 2: 160 - 166

DOI: https://doi.org/10.13995/j.cnki.11-1802/ts.024888

Conversion of brewing wastes into an organic fertilizer and its fertilizer efficiency

  • LI Zhe ,
  • ZHANG Suyi ,
  • YANG Hongjun ,
  • QIN Hui ,
  • YUAN Ling ,
  • YANG Ping ,
  • AO Zonghua ,
  • SONG Pan
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  • 1(College of Resources and Environment,Southwest University,Chongqing 400716,China)
    2(Luzhou Laojiao Co.Ltd,Luzhou 646000,China)

Received date: 2020-06-30

  Revised date: 2020-09-02

  Online published: 2021-02-07

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Abstract

The solid waste produced in brewing process,including sludge and distilled grains,is about three times of liquor.To investigate the conversion of the solid wastes discharged from Luzhou Laojiao Co.,Ltd.into an organic fertilizer by thermophilic composting,sorghum was supplied with the organic fertilizer to evaluate the fertilizer efficiency.The results showed that the mixture of sludge,distilled grains and decomposable inoculant was subject to heating,high temperature and cooling stages in the composting process.Concomitantly,nitrogen,phosphorus,potassium and humic acid in the compost substrates increased with moisture decreased while the substrate color changed from tawny to brown,black-brown or black.The mixture of sludge and distilled grains at the rate of 1∶2 in weight contained 65% moisture with about 25∶1 of C∶N ratio and pH 6.5 composted most rapidly.The organic fertilizer produced had high quality and fitted the National Organic Fertilizer Quality Standard (NY525-2012).The application of this organic fertilizer (OF) in combination with chemical fertilizers (CF) at the proportion of 1∶1 in the terms of nitrogen increased sorghum yield by 12.55%,grain nitrogen content by 36.70%,plant phosphorus uptake by 22.22% and potassium uptake by 29.20%,respectively,compared with those of CF alone.Besides,there were higher available nitrogen and enzyme activities (including phosphatase,urease and dehydrogenase) in the soil supplied with OF+CF than those of sole CF.Taken together,the mixture of sludge and distilled grains at an adequate proportion converted into an organic fertilizer through thermophilic composting,which fitted the National Standard.The application of OF plus CF at a proper rate increased sorghum yield,improved plant nutrient,and stimulated soil enzyme activity.

Key words： distiller′s grains; sludge; compost; fertilizer effect

Cite this article

LI Zhe , ZHANG Suyi , YANG Hongjun , QIN Hui , YUAN Ling , YANG Ping , AO Zonghua , SONG Pan . Conversion of brewing wastes into an organic fertilizer and its fertilizer efficiency[J]. Food and Fermentation Industries, 2021 , 47(2) : 160 -166 . DOI: 10.13995/j.cnki.11-1802/ts.024888

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