Animal waste containment in lagoons by Lakshmi N. Reddi, American Society of Civil Engineers Task

By Lakshmi N. Reddi, American Society of Civil Engineers Task Committee on Animal Waste con

''Animal Waste Containment in Lagoons'' offers a complete view of the cutting-edge perform of animal waste containment and offers instructions for destiny examine suggestions. Practitioners within the following disciplines: water assets, environmental, geotechnical, and agricultural engineering will locate this guide to be very useful. subject matters coated comprise: destiny of nitrogen compounds in animal waste lagoons; Seepage and delivery via anaerobic lagoon liners; Clogging of animal waste lagoon liners; comparing seepage losses and liner functionality at animal waste lagoons utilizing water stability equipment; Use of coal combustion by-products as low permeability liners for manure garage amenities; and Air caliber concerns linked to farm animals construction

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200 Sieve and have a PI less than 5. Soils that have 20% to 100% passing No. 200 Sieve and have a PI less than or equal to 15. Also included in this group are soils with less than 20% passing the No. 200 Sieve with fines having a PI of 5 or greater. Soils that have 20% to 100% passing No. 200 Sieve and have a PI of 16 to 30. Soils that have 20% to 100% passing No. 200 Sieve and have a PI of more than 30. Source: USDA 1997. PI = Plasticity Index. Note: ^Revised from SNTC Technical Note 716. The grouping was based on permeability tests conducted by NRCS soil mechanics laboratories on about 1,161 test samples.

The influent was replenished at approximately 2-week intervals. At the time of each replenishment, control samples of the waste influent were sent for analytical testing. 34 ANIMAL WASTE CONTAINMENT IN LAGOONS The permeabilities obtained for the three soil types are shown in Table 3-4. The entries in bold type correspond to the long-term experiments where waste liquid was used as the influent after permeability determination with water. These experiments ran up to 4 months, and the permeabilities reported in Table 3-4 were the averages of values measured at 1-day intervals.

This is shown schematically in Figure 3-3. 2), the permeabilities declined somewhat immediately after the introduction of the waste liquid and then leveled off, as shown in Figure 3-4. In all of the cases, the reduction occurred in the initial time periods, hence it was attributed to the physical clogging of samples 36 ANIMAL WASTE CONTAINMENT IN LAGOONS FIGURE 3-4. Permeability versus Time for the Three Soil Types Subjected to Swine Waste from Iowa Farms. caused by fine particles in the influent suspension.

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