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At the output of the wastewater treatement plant, the values of nitrates varied from 0.84 to 4.85 mg/L, conductivity varied from 1,670 to 2,000 μs/cm. (Table 3). These results indicate that the quality of the treated effluent is good and does not exceed the discharge standard in the natural environment.

Table 3

Quality variations of treated wastewater in Tiznit from March to September 2011

 Nitrates (mg/L)Conductivity (μs/cm)Fecal coliform (FC/100 mL)
March 1.16 1,670 400 
June 0.84 2,000 800 
September 4.85 1,685 400 
December 0.98 1,702 200 
 Nitrates (mg/L)Conductivity (μs/cm)Fecal coliform (FC/100 mL)
March 1.16 1,670 400 
June 0.84 2,000 800 
September 4.85 1,685 400 
December 0.98 1,702 200 

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