Primary estuaries characteristics

Primary estuaries are formed from terrestrial and/or tectonic processes with minimal changes from the sea that have essentially preserved their original characteristics. The four categories within primary estuaries are former fluvial valleys, former glacial valleys, river dominated, and structural. 

Primary estuary formed from terrestrial and/or tectonic processes with minimal changes from the sea—these systems have essentially preserved their original characteristics. 

Oil extraction wastewater is the water produced together with raw oil from stratum during the process of drilling. It has experienced the processes of raw oil collection and primary treatment hefore it was drilled. So contamination in the waste water is affected hy the characteristics of raw oil, oil stratum and conditions of raw oil collection and transportation (Dong, 2006). Such wastewater must be treated before released into the environment, otherwise its high mineral and organic content may severely pollute coastal waters, estuaries, rivers, the seashore, soil, and even the air (Chen et al.,... 

---