Anacostia River Discussion, science homework help

Each student is expected to post an essay of at least 100 words, and then respond to two other students’ posts. 

Suppose you visited the most impacted parts of the Anacostia River in DC or Maryland. The level of Dissolved Oxygen (DO) was less than 5mg/l. The water is turbid and green. The odor is bad too. Based on your observation, explain the cause of low DO, green color, turbid and bad odor. Provide suggestion to address this problem.