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What is needed to complete a large-scale dog manure composting operation?

Based on the research found, the following 5 Step procedure is an idealistic model for operationalizing a composting system. This process as a whole has not been tested.

5 Step Process

STEP 1: Collection

 

Manure should be dropped into the bin through an open top. Collections can be made with biodegradable bags or by using shovels and pooper scoopers. It is important that some bulking agent is added every time manure is added. The recommended amount is a 2:1 manure to bulking agent ratio. Appropriate bulking agents include fine wood chip mix, sawdust, and leaves. When the bin is full (1-2 days in a busy park) water should be added such that the pile has a consistency of a wrung out sponge. The pile should be lightly mixed and than capped. It is important for the pile to not exceed three feet, and that no fresh material is added after the pile is cap ( Based on UAF study, see references ).

 

STEP 2: Initial breakdown

The first two weeks the pile should be monitored carefully (every 3-4 days). The pile should heat up to about 130 to 170 deg F. The pile should be covered with bulking agent to deter critters. (Vermicomposting, 1) Monitoring the pile is conducted with a thermometer, after about two weeks, the temperature will eventually fall below 140 deg. When the temperature drops the pile is ready for step 3.

 

STEP 3: Secondary breakdown

If the pile has cooled, it simply needs a few turns to reactivate it. For between 4-8 weeks the pile should be turned about every four days. You know when to turn it by a drop in the temperature.

 

STEP 4: Settling

At the end of the eight weeks the pile can be taken out of the bin and placed in an open wire screen composter. While it is still important to keep the pile out of the rain, exposing it to air and moisture provides the final curing step. The pile can sit in this pile until it is ready for usage. The pile should be stirred with a pitch fork or shovel every week if left for a long time.

 

STEP 5: Usage

Once the pile has settled, it can be used in nearby natural areas. Due to a high salt content the compost may not be appropriate for all plantings. However, a long settling / residence time, reduces the salt content. The compost has been show to have appropriate phosphorus, nitrogen and potassium levels and consistently neutral pH levels.