Using a biodigesters as a pre water treatment

SUSTAINABLE RURAL DEVELOPMENT PROYECT Funding from the World Bank credit (100 million USD in two stages) and GEF (USD 10 million) donation. Promote the use of renewable energy and energy efficiency in the agricultural sector. Promotion of the competitiveness of agricultural activities. Reducing the impact of agriculture on the environment (water, air and soil)

FIRCO PROMOUTING AGRIBUSSINES AGRI-BUSINESS (Agriculture, livestock, aquaculture, fisheries and agro-industry) Vision: By using and investing in renewable energy are economically sustainable.

FIRCO´S SUPPORTED TECHNOLOGIES Biomass utilization Anaerobic Digesters Gasification Biogas and syngas use Electric generators Turbines Photovoltaic Solar photovoltaic off the grid Solar photovoltaic conected to the grid Solar heaters Evacuated tube solar collectors Concentrating solar systems Flat-plate solar collectors Energy efficiency High-efficiency heating Advanced electric motor drives Efficient lighting

BENEFITS OF USING BIODIGESTERS Environment Reducing greenhouse gas emissions Reducing water pollution Use of by-products Improvement of the habitat Energy Generate electricity by using biogas Reducing de use of fossil fuel Economic Reducing and sometimes avoided cost of electricity Avoided cost of electricity Reduction of the payment of duties and fines by digester discharges Social Employment generation Producers and workers training Minimize odors and pathogens

BENEFITS OF USING BIODIGESTERS Swine wastewater and its treatment characterization. Waste water from pig farms is a high variation in the concentration of pollutants. The use of anaerobic digesters of liquids and solids with high hydraulic retention times, greatly improved the treatment of effluents from pig farms. ↓ 96.4% Chemical Oxygen Demand COD Total Suspended solids TSS Biochemical Oxygen Demand BOD COD TSS BOD

GEOGRAPHICAL COVERAGE More than 100 From 50 to 99 From 10 to 49 From 1 to 9 Agricultural production areas Important correlation between States with greater number of bio-digesters and the areas of hog farms and dairy farms. High correlation with areas of agricultural production.

MEXICAN REGULATORY FRAMEWORK NOM-001-ECOL-1996 Maximum permissible limits of pollutants in discharges of wastewater into water and national property NOM-002-SEMARNAT-1996 Maximum permissible limits of pollutants in discharges of wastewater to urban or municipal sewage systems NOM-003-SEMARNAT-1997 Maximum permissible limits of pollutants for treated wastewater that is reusen on services to the public NOM-004-SEMARNAT-2002 Sludge and biosolids, specifications and maximum permissible limits of pollutants for its use and disposal Laws Federal rights National waters General ecological balance and environmental protection

MAXIMUN PERMISSIBLE LIMITS FOR BASIC CONTEMINANTS FOR AGRICULTURAL USE Parameters Rivers Natural and artificial reservoirs Soil Temperatura °C N.A 40 N.A. Fats and oils 25 Floating matter absent Settleable solids (ml/l) 2 Total suspended solids 200 125 Biochemical oxygen demand 150 Total Nitrogen 60 Total phosphorus 30 (NOM-001-ECOL-1996, daily average) (milligrams per litre, except where specified)

SWINE BIODIGESTER Biochemical oxygen demand reduction (mg/l) Average reduction 51.9% (6.3% – 92.7%) Physico-chemical characterization of effluents from bio-digesters, PDRS.

SWINE BIODIGESTER Total suspended solids reduction (mg/l) Average reduction 73.9% (8.7% – 99.7%) Physico-chemical characterization of effluents from bio-digesters, PDRS.

DAIRY CATTLE BIODIGESTER Biochemical oxygen demand reduction (mg/l) Average reduction 52.7% (12.2% – 88.2%) Physico-chemical characterization of effluents from bio-digesters, PDRS.

DARY CATLLE BIODIGESTER Total suspended solids reduction (mg/l) Average reduction 79.3% (22.6% – 94.9%) Physico-chemical characterization of effluents from bio-digesters, PDRS.

Natural and artificial reservoirs MAXIMUM PERMISSIBLE LIMITS FOR HEAVY METALS AND CYANIDES FOR AGRICULTURAL USE Parameters Rivers Natural and artificial reservoirs Soil Arsenic 0.4 Cadmium 0.1 Cyanides 3.0 Copper 6.0 Chrome 1.5 1.0 Mercury 0.02 0.01 Níckel 4 Lead 1 10 Cinc 20 (NOM-001-ECOL-1996, daily average) (milligrams per litre)

SWINE AND DAIRY CASSTLE BIODIGESTER HEAVY METAL AND CYANIDE REDUCTION (mg/l) Physico-chemical characterization of effluents from bio-digester systems, PDRS.

IMPACTS OF THE MANAGEMENT OF BIO-DIGESTERS TYPE Anaerobic Biodigester Technology in Methane Capture and Manure Management in Mexico, The History and Current Situation, United State Agency for International Development.

IRRIGATION WHIT EFFLUENT Irrigation with effluent The effluent of bio-digesters is prohibited for irrigation of vegetables and other crops of short stem. Practically 100% of the effluent of bio-digesters for agricultural irrigation is used in the livestock production units.

USING EFFLUENTS BENEFITS yield

CONCLUSIONS Mexico has experience in swine and dairy biodigesters FIRCO´s main goal it is implementing biodigesters for renewable energy, however, this technology has a collateral benefits, such as pre water treatment. It´s necessary a good biodigesters management in order to improve the water quality. Effluents may used for long stem crops and pastures. For delivering effluents to rivers and artificial ponds, it is necessary have a second water treatment.

Thank you Octavio Montufar Management Coordinator Sustainable Rural Development Project