#Source#Possible Cause#Management Approach
Feedstock receiving 1.1Materials arriving with odors1.1.1Mix materials upon receipt (increase material porosity)
    1.1.2Stockpile bulking agent or high carbon amendments as receiving basin
    1.1.3Stockpile bulking agents or high carbon amendments for unexpected deliveries
   Amendment offsite1.1.4Make smaller piles
   prior to arrival1.1.5Consider blanketing odiferous materials with a six inch to one-foot layer of bulking agent, high carbon amendments or finished compost (water lightly to reduce odor releases)
    1.1.6Enclose the receiving floor
    1.1.7Aerate receiving floor
    1.1.8Add lime or wood ash to piles to adjust pH
    1.1.9Reject odorous loads if possible
    1.1.10Eliminate troublesome feedstocks
    1.1.11Incorporate wet or odorous loads directly into actively composting windrows
  1.2Material sitting too long prior to being processed or mixed1.2.1Expedite material processing
    1.2.2Increase operating shifts.
    1.2.3Reduce incoming throughput
    1.2.4Identify alternative outlets for incoming materials
    1.2.5First in, first out processing
    1.2.6Reduce size of material stockpiles
    1.2.7Increase collection frequency
    1.2.8Increase grinding/processing capacity (contract grinder/screener)
    1.2.9Consider blanketing odiferous materials with a six inch to one-foot layer of bulking agent, high carbon amendments or finished compost (water lightly to reduce odor releases)
2Grinding2.1Grinding volatilizes particles2.1.1Add light misting of water or odor neutralizer to grinder at discharge points
    2.1.2Consider scheduling grinding to coincide with favorable atmospheric dispersion conditions
    2.1.3Consider grinding green materials with woodier materials
    2.1.4Consider providing redundant equipment to assure on-time processing of materials
    2.1.5Identify alternative processing facilities for unexpected deliveries or equipment failures
3Mixing and Material 3.1Mixing volatilizes particles3.1.1Create windrows/piles that are sufficiently blended
 Handling  3.1.2Combine materials to achieve a high C:N ratio (greater than 30 to 1)
    3.1.3Create piles with good porosity
    3.1.4Mixing areas/activities should be located as far as possible from sensitive receptors
    3.1.5Reduce mixing/materials handling activity during stagnant air conditions
    3.1.6Reduce mixing/materials handling activity when wind is in direction of receptors
    3.1.8Mist water or odor neutralizer at dust generation points
4Composting4.1Less than ideal conditions4.1.1Reduce turning and/or material handling activity during stagnant air conditions
    4.1.2Reduce turning/material handling activity when wind is in direction of nearby receptors
    4.1.3Turn regularly to re-invigorate the composting process
    4.1.4Maintain sufficient moisture in windrows
    4.1.5Avoid over-watering windrows
    4.1.6Make smaller windrows to increase passive aeration
    4.1.7Diligently monitor and manage the composting process
    4.1.8Increase porosity and bulk density
    4.1.9Consider blanketing odiferous materials with a six inch to one-foot layer of bulking agent, high carbon amendments or finished compost (water lightly to reduce odor releases)
    4.1.10Make piles on a one-foot bed of overs to increase airflow
    4.1.11Adopt forced aeration
    4.1.12Adopt a contained method of composting
    4.1.13Treat exhaust gases in a biofilter or other treatment system
5Screening5.1Screening volatilize particles5.1.1Reduce screening activity during stagnant air conditions
    5.1.2Reduce screening activity when wind is in direction of nearby receptors
    5.1.3Mist water or neutralizer at dust generation points
6Site 6.1Water allowed to pond 6.1.1Clean aisles of spilled material. (Particularly at the end of each day)
    6.1.2Grade the site to eliminate puddles, depressions, and wheel ruts where water collects
    6.1.3Absorb ponded water with wood chips/other absorbent, fill pothole with soil/pad material
  6.2Uncomposted material on aisles6.2.1Clean aisles of spilled material. (Particularly at the end of each day)
    6.2.2Mechanically sweep paved areas at the end of each shift
    6.2.3Apply water and/or neutralizer to reduce dust during dry conditions
7Curing Piles7.1Excessive temperature7.1.1Decrease curing pile size (height)
    7.1.2Increase processing time prior to moving to curing
    7.1.3Review moisture content of in-process compost
    7.1.4Screen after curing to maintain porosity
    7.1.5Aerate curing piles
8Storm water retention basin8.1Excessive nutrients in stormwater runoff8.1.1Review NPDES procedures to minimize storm water contact with organic materials
    8.1.2Remove particles from water draining into stormwater retention basin
    8.1.3Filter stormwater through a filter berm or sock
    8.1.4Increase retention basin capacity
    8.1.5Clean retention pond during dry season
    8.1.6Consider applying retained storm water to piles needing moisture
    8.1.7Consider irrigating crops/pasture with retained stormwater
    8.1.8Provide aeration to stormwater retention basin

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