Organic waste material aerobic fermented manure quick-composting and element stabilizing method

Abstract

The invention discloses an organic waste material aerobic fermented manure quick-composting and element stabilizing method. By utilizing a pyrolysis / impulse type magnetic field / aerobic biotransformation technology, the effects on quickly composting fecal residue and waste water and passivating heavy metal are achieved; by utilizing a struvite crystallization method, the nitrogen loss during the composting process is resisted and controlled; by utilizing a magnetic separation technology, an organic fertilizer and magnetic charcoal adsorbing the heavy metal are successfully separated, so that the aim of improving the safety of an organic fertilizer is achieved. By utilizing the method provided by the invention, the composting index quickly reaches to a high composting level (the nitrate index (NI): NH4-N / NO3-N(0.5;GI) 90 percent), the heavy metal in an aerobic fermentation material is passivated, and the copper-zinc-arsenic-cadmium passivating rate is larger than 90 percent; meanwhile, the loss of inorganic-state nitrogen in the composting process can be effectively resisted and controlled, and the nitrogen resisting and controlling rate is larger than 90 percent; the recovery rate of the magnetic charcoal adsorbing the heavy metal is larger than 90 percent.

Description

technical field [0001] The invention relates to the technical field of agricultural resources and environment, in particular to a method for rapid decomposition and element stabilization of organic waste aerobic fermentation compost. Background technique [0002] In recent years, as my country's farming methods have gradually shifted to large-scale and intensive livestock and poultry farming and the scale of breeding has continued to expand, a large amount of livestock and poultry manure and excreta have been produced, and environmental problems such as agricultural non-point source pollution have become increasingly prominent. . It is estimated that by 2020, the production of livestock and poultry manure in my country will reach 4.244 billion tons, which is about five times that of urban municipal sludge. Livestock and poultry manure is rich in nutrients such as nitrogen, phosphorus, potassium, organic matter, and trace elements, and is an important source of organic fertil...

AI Technical Summary

Problems solved by technology

[0003] At present, the utilization of carbon, nitrogen, and phosphorus resources in the aerobic composting process has the following difficulties, mainly including: the release of CH during the composting process 4 , N 2 O and other greenhouse gases and a large amount of ammonia lead to the loss of carbon and nitrogen and the quality of compost products is reduced; 2 S, NH 3 , salt ions), after it is applied to the soil, the pathogenic bacteria continue to decompose organic matter, compete with plants for oxygen, and produce a local anaerobic environment; excessively high concentrations of ammonium ions, organic acids and other intermediate metabolites can also cause crop seedling burning

At the same time, for the passivation of heavy metals in livestock and poultry manure during the composting process, the main difficulties are: the low passivation rate of heavy metals in the composting process, which is easy to cause secondary pollution, and the heavy metals cannot be completely removed during the composting process. The change of organic matter form in poultry manure complexes and fixes heavy metals, reducing their activity; after the compost products are applied to the soil, the pH and microbial flora change, and the passivated heavy metal elements are easy to combine with the accompanying substances and are re-released into the soil. environment, causing secondary pollution

[0004] At present, a single composting method can no longer meet the technical needs of rapid decomposition and element stabilization of livestock and poultry manure at the same time. A new method of aerobic bioconversion composting is developed to overcome the existing technical problems and realize the rapid humification and stabilization of compost. Element stabilization has important research and promotion significance

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