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The sludge that is created through sewage treatment processes is rich in nutrients like phosphorous and nitrogen, making it an excellent source of fertilizer for agriculture. But research has found it also contains significant amounts of microplastics.
Cardiff University researchers calculated that between 31,000 and 42,000 tons of microplastic particles (or 86-710 trillion microplastic particles) are introduced to European soils each year, reflecting the quantity of microplastics detected in ocean surface waters
We might have unknowingly been dumping huge quantities of microplastics on our croplands.