MOROCOMP (LIFE TCY05/MA000141) - Unit of Environmental ...

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Heavy Metals Cadmium TMECC 4.06-Cd Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Chromium TMECC 4.06-Cr Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Copper TMECC 4.05-Cu Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Nickel TMECC 4.06-Ni Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Lead TMECC 4.06-Pb Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Zinc TMECC 4.06-Zn Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Heavy Metals Speciation 40CFR 261.24 US EPA Extraction Procedure Toxicity Test Federal Register Pathogens Testing Total Coliforms TMECC 07.01-A Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Faecal Coliforms TMECC 07.01-B Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. Helminths TMECC 07.04 Test Methods for the Examination of Composting and Compost, USDA and U.S. Composting Council. 2002. 22
4.2. Composting mixtures The chemical composition of the substrate as well as the particle size, porosity, structure and texture of the raw composting material significantly affect composting processes. The easily hydrolyzed chemical compounds accelerate composting while the surface to volume ratio of particles influences significantly the composting conditions. The primary sludge from El Jadida city, that was used as a primary raw composting material, did not undergo dewatering and the addition of green waste, acquiring low water content, was considered appropriate in order to balance the level of the substrate’s water level. Feedstock with different moisture holding capacities can be blended to achieve ideal moisture content. Another important reason for mixing green waste with sludge is that green waste constitutes a good bulking material which modifies the physical properties of the substrate by lowering the moisture content, providing structural support, increasing porosity, and favoring aeration. In addition, green waste acquire notable amount of nutrient compounds thus providing essential minerals, mainly nitrogen and phosphorous, to the substrate. Manure of different origin (sheep and cow) was also used in the composting trials since the high availability and organic content, the low heavy metal content and the absence of other hazardous substances make manure excellent composting material. Furthermore manure acquires high nitrogen and phosphorous content which are basic nutrient components for plant growth. Additives such as zeolite and perlite were obtained from Moroccan local market. Zeolite was used as additive in order to examine primarily the heavy metals removal from the substrate and secondly its capability to adsorb the volatilized ammonia during composting. The importance of the later lies in the fact that nitrogen losses, which occur mainly during the initial stages of composting, result from ammonia volatilization. High losses of ammonia nitrogen represent a waste of a valuable resource and reduce the agronomic value of the end-product. The importance of perlite use as an additive lies in the fact that it modifies the physical properties of the substrate (e.g. structural support, porosity, aeration) to promote composting by 23
Page 1 and 2: U C D UNIVERSITE CHOUAIB DOUKKALI N
Page 3 and 4: 5.1.4. Feeding the in-vessel biorea
Page 5 and 6: 5.4.5.4. Measuring the oxygen conte
Page 7 and 8: Table 9: Typical nutrient compositi
Page 9 and 10: The temperature profiles of the com
Page 11 and 12: 1. Introduction to composting proce
Page 13 and 14: 2.2. Particle size, porosity, struc
Page 15 and 16: This will limit the movement of air
Page 17 and 18: sludge treatment is an immense prob
Page 19 and 20: Due to the unavailability of the UW
Page 21: Table 1: Parameters evaluated the s
Page 25 and 26: The ventilator system can operate X
Page 27 and 28: 4.4. Sampling and analysis of the s
Page 29 and 30: 5. Results and discussion The compo
Page 31 and 32: fertilisers. According to Table 2 t
Page 35 and 36: eplaced by others that are thermoph
Page 37 and 38: ventilation of the substrate is a v
Page 39 and 40: which disperses gases through an ai
Page 41 and 42: [ % ] 45 40 35 30 25 1 3 5 7 9 11 1
Page 43 and 44: acquired due to processes of non-sy
Page 45 and 46: [mg/kg] 1400 1200 1000 800 600 400
Page 47 and 48: which occurs through the bio-oxidat
Page 49 and 50: Table 7: Suggested limit values for
Page 51 and 52: Cd (mg/Kg d.s) 0.4739 Cr (mg/Kg d.s
Page 53 and 54: decomposition can pose an indirect
Page 55 and 56: produced from the 1 st trial is cla
Page 57 and 58: Biological assays To estimate the r
Page 59 and 60: 5.1.10. Preparing the system for th
Page 61 and 62: K, as K 2 O (% d.s) 0.9670 4.2683 3
Page 65 and 66: 5.2.5.3. Measuring the moisture of
Page 67 and 68: 5.2.5.6. Monitoring and maintenance
Page 69 and 70: [ % ] 50 45 40 35 30 1 3 5 7 9 11 1
Page 71 and 72: 5.2.6.4. Ammonium Nitrogen (NH + 4
Page 73 and 74:
parts carbon for each part of nitro
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educed and on the 18 th day ammoniu
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With respect to the ammonium and ni
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% d.s. Dissolved in H2O Dissolved i
Page 81 and 82:
5.3. Composting using primary sludg
Page 83 and 84:
is used for agricultural purposes w
Page 85 and 86:
5.3.4. Feeding the in-vessel biorea
Page 87 and 88:
material. Only after all substrate,
Page 89 and 90:
conditions in the bioreactor. At th
Page 91 and 92:
[ % ] 40 35 30 25 20 1 3 5 7 9 11 1
Page 93 and 94:
[ mg/Kg ] 800 700 600 500 400 300 2
Page 95 and 96:
C:N ratios as has been shown in Tab
Page 97 and 98:
leachates through the ion exchange
Page 99 and 100:
[2, 3, 4, 5, 6] for the development
Page 101 and 102:
[% d.s.] Dissolved in H2O Dissolved
Page 103 and 104:
5.4. Composting using secondary slu
Page 105 and 106:
5.4.2. Composition of the compostin
Page 107 and 108:
operation as well as the water flow
Page 109 and 110:
can become anaerobic. As has been m
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pH 10 9 8 7 6 5 1 2 3 4 5 6 7 8 9 1
Page 113 and 114:
[ % ] 6 5,5 5 4,5 4 1 2 3 4 5 6 7 8
Page 115 and 116:
5.4.6.5. Nitrates (NO - 3 - N) Besi
Page 117 and 118:
Table 36: Characteristics of leacha
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NH 4+ - N (mg/Kg.d.s) 304.10 Total
Page 121 and 122:
Heavy metals speciation Furthermore
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Faecal coliforms Log10 MPN/10g DS 0
Page 125 and 126:
the degradation and stabilization o
Page 127 and 128:
Table 40: The physicochemical chara
Page 129 and 130:
7. References [1] Malamis, S. (2000
Page 131 and 132:
[29] Pagans, E., Barrena, R., Font,
Page 133 and 134:
[56] Zorpas, A.A., Arapoglou, D., P
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