Abstract Abstract Current global sanitation systems follow a 'linear model', where biogenic nutrients are taken up from the soil through grains and discharged into water bodies. This paper proposes an alternative 'cyclical model' of this process. The argument is that instead of treating human excreta as "nuclear waste" or disposable waste, it should be treated as aBiogeochemical resourcesInstead of dumping it into rivers or burying it deep, it is essential to recycle it through surface dehydration and atmospheric exposure. This process not only restores soil fertility but also ensures the micronutrient quality of the grain, which depends on the balance between atmospheric elements and soil nutrients. 1. The Scientific Rationale 1. 1 Nutrient depletion and soil imbalance Grain production depletes soil of elements such as nitrogen (N), phosphorus (P), and potassium (K). Currently, chemical fertilizers are used to replace these elements, which destroy the soil's biological structure. Human waste is rich in these elements. If discharged into rivers, it causes water pollution (eutrophication), and if buried deep, it decomposes in anaerobic (oxygen-free) conditions, producing harmful gases. 1. 2 Atmospheric Interaction and Solar Energy Grain is formed not just from the soil, but from the combination of atmospheric carbon and solar energy through photosynthesis. The research argues that: Surface Treatment: The process of drying the waste by exposing it to solar radiation (UV rays) and air destroys germs. Recycling Loop: When the waste is dried and incorporated into the topsoil, it facilitates the exchange of nutrients between the atmosphere and the soil, thereby increasing the nutrient density of the grain produced. 2. Proposed Technology Model: 'Dry Recycling' This model is based on the following steps: Waterless Separation: Keeping faeces and urine away from contact with water so that infection does not spread. Dehydration: Drying in open air and sunlight so that gaseous exchange can take place naturally. Surface Integration: Instead of burying it underground, mix it into the topsoil, where microorganisms can actively convert it into compost. Conclusion This research paper concludes that disposing of human waste in rivers or burying it underground is scientifically untenable. A key step in maintaining food security and grain quality is the"Frequency Cycle"There is a need for a bioresource where the excreted parts of the human body become part of the same ecosystem from which it obtained its nutrition.
BHUTAJI et al. (Sun,) studied this question.
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