California Department of Resources Recycling and Recovery (CalRecycle) 

The Comprehensive Compost Odor Response Project (C-CORP) Report

Table 12: Summary of Mitigation Strategy Menu

# Source # Possible Cause # Management Approach
Feedstock receiving 1.1 Materials arriving with odors 1.1.1 Mix materials upon receipt (increase material porosity)
        1.1.2 Stockpile bulking agent or high carbon amendments as receiving basin
        1.1.3 Stockpile bulking agents or high carbon amendments for unexpected deliveries
      Amendment offsite 1.1.4 Make smaller piles
      prior to arrival 1.1.5 Consider 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)
        1.1.6 Enclose the receiving floor
        1.1.7 Aerate receiving floor
        1.1.8 Add lime or wood ash to piles to adjust pH
        1.1.9 Reject odorous loads if possible
        1.1.10 Eliminate troublesome feedstocks
        1.1.11 Incorporate wet or odorous loads directly into actively composting windrows
    1.2 Material sitting too long prior to being processed or mixed 1.2.1 Expedite material processing
        1.2.2 Increase operating shifts.
        1.2.3 Reduce incoming throughput
        1.2.4 Identify alternative outlets for incoming materials
        1.2.5 First in, first out processing
        1.2.6 Reduce size of material stockpiles
        1.2.7 Increase collection frequency
        1.2.8 Increase grinding/processing capacity (contract grinder/screener)
        1.2.9 Consider 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)
2 Grinding 2.1 Grinding volatilizes particles 2.1.1 Add light misting of water or odor neutralizer to grinder at discharge points
        2.1.2 Consider scheduling grinding to coincide with favorable atmospheric dispersion conditions
        2.1.3 Consider grinding green materials with woodier materials
        2.1.4 Consider providing redundant equipment to assure on-time processing of materials
        2.1.5 Identify alternative processing facilities for unexpected deliveries or equipment failures
3 Mixing and Material 3.1 Mixing volatilizes particles 3.1.1 Create windrows/piles that are sufficiently blended
  Handling     3.1.2 Combine materials to achieve a high C:N ratio (greater than 30 to 1)
        3.1.3 Create piles with good porosity
        3.1.4 Mixing areas/activities should be located as far as possible from sensitive receptors
        3.1.5 Reduce mixing/materials handling activity during stagnant air conditions
        3.1.6 Reduce mixing/materials handling activity when wind is in direction of receptors
        3.1.8 Mist water or odor neutralizer at dust generation points
4 Composting 4.1 Less than ideal conditions 4.1.1 Reduce turning and/or material handling activity during stagnant air conditions
        4.1.2 Reduce turning/material handling activity when wind is in direction of nearby receptors
        4.1.3 Turn regularly to re-invigorate the composting process
        4.1.4 Maintain sufficient moisture in windrows
        4.1.5 Avoid over-watering windrows
        4.1.6 Make smaller windrows to increase passive aeration
        4.1.7 Diligently monitor and manage the composting process
        4.1.8 Increase porosity and bulk density
        4.1.9 Consider 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)
        4.1.10 Make piles on a one-foot bed of overs to increase airflow
        4.1.11 Adopt forced aeration
        4.1.12 Adopt a contained method of composting
        4.1.13 Treat exhaust gases in a biofilter or other treatment system
5 Screening 5.1 Screening volatilize particles 5.1.1 Reduce screening activity during stagnant air conditions
        5.1.2 Reduce screening activity when wind is in direction of nearby receptors
        5.1.3 Mist water or neutralizer at dust generation points
6 Site 6.1 Water allowed to pond 6.1.1 Clean aisles of spilled material. (Particularly at the end of each day)
        6.1.2 Grade the site to eliminate puddles, depressions, and wheel ruts where water collects
        6.1.3 Absorb ponded water with wood chips/other absorbent, fill pothole with soil/pad material
    6.2 Uncomposted material on aisles 6.2.1 Clean aisles of spilled material. (Particularly at the end of each day)
        6.2.2 Mechanically sweep paved areas at the end of each shift
        6.2.3 Apply water and/or neutralizer to reduce dust during dry conditions
7 Curing Piles 7.1 Excessive temperature 7.1.1 Decrease curing pile size (height)
        7.1.2 Increase processing time prior to moving to curing
        7.1.3 Review moisture content of in-process compost
        7.1.4 Screen after curing to maintain porosity
        7.1.5 Aerate curing piles
8 Storm water retention basin 8.1 Excessive nutrients in stormwater runoff 8.1.1 Review NPDES procedures to minimize storm water contact with organic materials
        8.1.2 Remove particles from water draining into stormwater retention basin
        8.1.3 Filter stormwater through a filter berm or sock
        8.1.4 Increase retention basin capacity
        8.1.5 Clean retention pond during dry season
        8.1.6 Consider applying retained storm water to piles needing moisture
        8.1.7 Consider irrigating crops/pasture with retained stormwater
        8.1.8 Provide aeration to stormwater retention basin

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C-CORP Report | Best Management Practices Home

Last updated: August 14, 2008
Compostable Materials, http://www.calrecycle.ca.gov/SWFacilities/Compostables/
Martin Perez: Martin.Perez@calrecycle.ca.gov (916) 323-0834