Sewage, fertilizer

Water Over-exploitation of groundwater has led to a decrease in the level of groundwater in many agricultural regions of Asia, North Africa, the Middle East, and the U.S.A. The impact of sewage, fertilizers, pesticides, oil product remains, heavy metals, stable phosphor-organic compounds and radioactive substances has led to a substantial decrease of groundwater quality. 

Under the pressure of progressively more stringent government regulations with regard to permissible levels of residual NH and urea content in wastewaters, the fertilizer industry made an effort to improve wastewater treatment (see also Water, sewage). 

Nitrate (measured as Nitrogen) 10 10 "Blue baby syndrome" in infants under six months -life threatening without immediate medical attention. Symptoms Infant looks blue and has shortness of breath. Runoff from fertilizer use leaching from septic tanks, sewage erosion of natural deposits... 

Riesel-feld, n. field irrigated with sewage, -hohe,/. packing depth (of a tower). -jauche, /. sewage (as a fertilizer), -kolonne,/. trickling column, -kiihler, m. spray cooler, trickling cooler. 

Plant nutrients From sewage and drainage of fertilized farmland. Causes rapid algae growth that uses up oxygen (eutrophication). 

The human and environmental protection goals in EUSES are human populations (workers, consumers, and man exposed via the environment) and ecological systems (micro-organisms in sewage treatment systems, aquatic ecosystems, terrestrial ecosystems, sediment ecosystems, and predators). Repeated dose toxicity, fertility toxicity, maternal toxicity, developmental toxicity, carcinogenic risk, and lifetime cancer risk can be calculated for the cases that literature data is available. 

The limitation of transfer of the contaminants via sewage sludge used as fertilizer... 

Zinc fertilizer is used to supply plants to correct for Zn deficiency. In 1987, Zn fertilizers were used in an area of more than 2,670,000 ha in China (Zhu, 1996). Zinc inorganic salts, chelate forms, and biosolids such as sewage sludge have been applied to arid and semi-arid soils to correct for Zn deficiency. 

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