تاثیر چهار نوع جاذب زیستی بر کاهش پارامتر های نیترات، فسفات، شوری، pH و تغییرات دمایی پساب خروجی از اراضی شالیزاری

Clean water is the most important need of human life to create safe conditions for human life. Pure water resources scarcity and high costs often hinder access to treatment plant which is vital to human societies. This research aimed to evaluate agricultural drain water quality from paddy fields after harvest and drain water treatment to reduce some harmful drain water parameters. In this study the performance of four types of biofilters consists of wood sawdust, rice husk, charcoal and tea wastes were evaluated. Data were taken at intervals of ten-day period from drain water of paddy fields to study the parameters of nitrate, phosphate, pH and EC. Observations showed that all four biofilters types in some cases reduced the pollutant amounts. These increase and decrease depends on many things which the most important factors were pollutant concentration in drain water and air temperature. Among the four types of biofilter, sawdust biofilter had relatively a better performance e.g. nitrate was reduced from ۴.۵۴ to ۰.۲۵ mg l-۱. Economical comparison showed that sawdust biofilter was better than other four types of biofilter, e.g. sawdust biofilter is ۸۰% cheaper than charcoal biofilter.  

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سبوس برنج ، خاک اره ، زایدات چای ، ذغال چوب