COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

overdosing with lime (that is, adding more than is nutrients, and organic matter, reducing reliance on needed to reach a pH of 12), by using a other fertilizers. supplemental heat source,or by using a combination of the two. Monitoring for fecal coliforms or Alkaline stabilized biosolids are also useful as daily Salmonella sp. is required prior to release by the landfill cover. They satisfy the federal requirement generator for use. that landfills must be covered with soil or soil-like material at the end of each day (40 CFR 258). In The Part 503 Rule also allows for meeting Class A most cases, lime stabilized biosolids are blended pathogen reduction requirements through with other soil to achieve the proper consistency for monitoring for pathogens before and after daily cover. processing. For example, Class A Alternative 3 requires that the unprocessed wastewater solids be As previously mentioned, alkaline stabilized monitored for enteric viruses and helminth ova. The biosolids are excellent for land reclamation in process is monitored for lime dosage and pH and degraded areas, including acid mine spoils or mine the final product must have no detectable levels of tailings. Soil conditions at such sites are very enteric viruses or helminth ova. unfavorable for vegetative growth often due to acid content, lack of nutrients, elevated levels of heavy For more specific details on the requirements for metals, and poor soil texture. Alkaline stabilized achieving Class A or B,please refer to the Part 503 biosolids help to remedy these problems, making Rule. conditions more favorable for plant growth and reducing erosion potential. In addition, once a Materials that may be used for alkaline stabilization vegetative cover is established, the quality of mine include hydrated lime,quicklime(calcium oxide),fly drainage improves. ash, lime and cement kiln dust, and carbide lime. Quicklime is commonly used because it has a high APPLICABILITY heat of hydrolysis (491 British thermal units) and can significantly enhance pathogen destruction. Fly Where lime or another alkaline additive (for ash, lime kiln dust, or cement kiln dust are often example, recycled kiln dust), is relatively used for alkaline stabilization because of their inexpensive, alkaline stabilization is often the most availability and relatively low cost. cost-effective process for wastewater solids stabilization. This is particularly true where The alkaline stabilized product is suitable for dependable markets for the alkaline product can be application in many situations, such as landscaping, developed, such as in areas where alkaline materials agriculture, and mine reclamation. The product are routinely applied to agricultural soils to serves as a lime substitute,source of organic matter, maximize crop yields. and a speciality fertilizer. The addition of alkaline stabilized biosolids results in more favorable Alkaline stabilization is practical at small wastewater conditions for vegetative growth by improving soil treatment plants that store wastewater solids for properties such as pH, texture, and water holding later transportation to larger facilities for further capacity. Appropriate applications depend on the treatment. It is also applicable as an expansion of needs of the soil and crops that will be grown and existing facilities or as a new facility to reduce odors the pathogen classification. For example, a Class B and pathogens. The technology is especially useful material would not be suitable for blending in a top at wastewater treatment facilities with flows that soil mix intended for use in home landscaping but is vary greatly since the process adjusts easily to suitable for agriculture, mine reclamation, and changing flows. This adaptability also makes landfill cover where the potential for contact with alkaline stabilization an appropriate choice as a the public is lower and access can be restricted. secondary or backup stabilization method because Class A alkaline stabilized biosolids are useful in these facilities can be started and stopped relatively agriculture and as a topsoil blend ingredient. quickly and easily. Facilities can also be designed to Alkaline stabilized biosolids provide pH adjustment, handle either liquid or dewatered wastewater solids.