Stabilization by co-composting of solids removed from wastewater treatment plant of a cheese factory
A wastewater plant of a dairy industry generates 1.6 tons/month of settleable solids and 650 kg/week of floatable solids, which if not adequately disposed off, can cause serious soil contamination and vector attraction. A composting process for stabilizing residues with high fat content that generate unpleasant odors is presented. Laboratory experiments were carried out for determining the appropriate process parameters and scaled-up for the in situ process. Laboratory tests with cattle manure showed a reduction in the production of malodorous gases in three weeks. The resulting compost complied with national and international standards, and can be used in 1:3 compost:soil ratio for soil improvement. The waste stabilized in situ complied with most parameters established in the Mexican regulation (NOM-FF-109-SCFI-2007), excepting pH (9.6) and electrical conductivity (5 dS/m).
| Main Authors: | , , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Universidad Autónoma Metropolitana, División de Ciencias Básicas e Ingeniería
2015
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1665-27382015000100006 |
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| Summary: | A wastewater plant of a dairy industry generates 1.6 tons/month of settleable solids and 650 kg/week of floatable solids, which if not adequately disposed off, can cause serious soil contamination and vector attraction. A composting process for stabilizing residues with high fat content that generate unpleasant odors is presented. Laboratory experiments were carried out for determining the appropriate process parameters and scaled-up for the in situ process. Laboratory tests with cattle manure showed a reduction in the production of malodorous gases in three weeks. The resulting compost complied with national and international standards, and can be used in 1:3 compost:soil ratio for soil improvement. The waste stabilized in situ complied with most parameters established in the Mexican regulation (NOM-FF-109-SCFI-2007), excepting pH (9.6) and electrical conductivity (5 dS/m). |
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