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Implementation of strategies to optimize the co- composting of green waste and food waste in developing countries. A case study: Colombia A. Hernndez-Gmez, D. Gordillo, F . Gmez, A. Caldern, C. Medina, V. Snchez-T orres, E. R.

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Implementation of strategies to

  • ptimize the co-

composting of green waste and food waste in developing

  • countries. A case study: Colombia
  • A. Hernández-Gómez, D. Gordillo, F

. Gómez, A. Calderón,

  • C. Medina, V. Sánchez-T
  • rres, E. R. Oviedo-Ocaña
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Outline

 Introduction  Materials and Methods  Results and Discussion  Conclusions  References

2

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 Introduction  Materials and Methods  Results and Discussion  Conclusions  References

3

Outline

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(T roschinetz & Mihelcic, 2009)

Introduction

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(BID, 2015) Food Waste (FW) Green Waste (GW) Characterization of solid waste in some cities of Colombia

Introduction

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Composti ng

GW are mainly composed by:  Lignin  Hemicellulose  Cellulose

Management alternative: Limitations regarding the processing time and quality of the product

Introduction

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Strategies:  Food waste co-composting  T wo-stage composting (TSC)  Phosphate Rock (PR) addition

Introduction

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(Zhang et al. 2013)

Introduction

Strategies:  Food waste co-composting  Two-stage composting (TSC)  Phosphate Rock (PR) addition

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 Introduction  Materials and Methods  Results and Discussion  Conclusions  References

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Outline

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Estimation of the production and physical composition of GW  Each of the discharges made by the collector truck during the study period were monitored.  The total capacity of the truck was 7.4 m³ (3.7 x 2 x 1 m)

Materials and Methods

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 NMX-AA-19-1985 for sample quartering  NMX-AA-15-1985 for bulk density Estimation of the production and physical composition of GW

Materials and Methods

Co-composting of GW, PF and UF using TSC and traditional (T)

TA TB

(TSC + 15% PR) (T +15% PR)

TC

(T)

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 Introduction  Materials and Methods  Results and Discussion  Conclusions  References

12

Outline

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Total production

Bulk density = 153.25 kg/m³

1 2 3 4 5 6 7 8 9 10 11 12 13 50 80 110 140 170 200 230 192,9192,45 156,02 137,68 199,35 144,29 167,58 130,3 121,76 80 127,24 189,47 PESO VOLUMÉTRICO Rainy period Test Bulk density [kg/m³]

Production = 732.5 kg/day 73.25 kg/day-ha Green areas

Results and Discussion

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Physical composition

74% can be used in GW composting processes

Results and Discussion

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10 20 30 40 50 60 70 80 90 100 0,0 10,0 20,0 30,0 40,0 50,0 60,0 70,0 TA TB TC Tam b. V. Time (days) Temperature (°C)

Results and Discussion

Composting process

10 20 30 40 50 60 70 80 90 100 2 4 6 8 10 TA TB TC Time (days) pH

10 20 30 40 50 60 70 80 90 100 150 300 450 600 750 TA TB TC Time (days) BD (K g/m³)

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Treatment Ash (%) CEC (cmol/kg) TOC (%) EC (mS/cm) WRC (%) PT (%) TA 74,87(4,04)a 22,00(1,48)b 16,63(6,60)a 0,20(0,15)a 153,73(11,38)b 6,56(1,14)a TB 74,83(2,95)a 20,43(4,35)b 12,21(3,98)a 0,13(0,02)a 145,60(12,60)b 7,33(0,04)a TC 51,60(13,55)b 32,77(3,66)a 20,87(7,87)a 0,21(0,01)a 237,47(66,40)a 0,56(0,24)b NTC 5167 < 60 >30 >15

  • >100

>1 NCh 2880

  • < 3
  • Moisture (%)

TON (%) pH GI (%) C/N

  • TA

30,37(1,81)ab 0,88(0,15)b 7,72(0,10)a 176a 20,00(11,00)

  • TB

27,97(2,14)b 0,73(0,03)b 7,80(0,04)a 163ab 16,57(4,74)

  • TC

33,87(3,56)a 1,37(0,15)a 7,51(0,07)b 102b 14,93(3,88

  • NTC 5167

<35 >1 >4 - <9

  • NCh 2880

30 - 45 > 0,5 5 - 8.5 > 80 < 25

  • Results and Discussion

Composting process

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 Introduction  Materials and Methods  Results and Discussion  Conclusions  References

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Outline

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 The bulk density of GW varies considerably due to the typical climatic conditions of the context.  In the institution of higher education UIS, the production of GW is about 732.5 kg per day, whereof 74% (i.e. leaves, branches and grass clippings) can be recycling by composting processes.  Regarding the composting process, TA and TB did not present signifjcant difgerences (p ≤ 0.05) in most of the evaluated parameters, which allows to affjrm that the two-stage composting did not represent time optimization or improvements in the quality of the product.  The PR achieved increasing the phosphorous content in the product; however, it is necessary to decrease the percentage of PR added, due to the fact that possible inhibitions of the process were presented due to the high content

  • applied. TC presented better results in terms of product quality; however, it

still has defjciencies in phosphorus content.

Conclusions

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This work was carried out thanks to the support of the Universidad Industrial de Santander (Colombia), through the project 2354 of 2017

Acknowledgments THANK YOU!

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References