Announcement

On the 6th of April, I have corrected 40 on-line mid term tests with comment. Please check your result.

I have received 5 'first paragraphs' on Television and gave respond, please check and you may have to continue to the 2nd paragraph or rewrite your 1st paragraph.

Sewage Water Purification Management

Sewage water purification consists of three parts sewage management that starts from main sewers. Firstly, from the main sewer, sewage is distributed to a settling tank. Here, undecayed solid materials are left on the bottom of the tank and separated with polluted water. Then the polluted water is pumped to pump house. After the polluted water passed the pump house, it is distributed to a sprinkles bed. In this part, the polluted water from pump house are flowed up to jets and rotated with rotating arms. Then the polluted water is filtered from stones and microorganisms, so it will make the water more purified. Lastly, the purified water from the sprinkles bed enters the river.

Sewage Disposal Unit

Dangerous liquid sewage from the industry can be processed through purification process in the sewage disposal unit. Generally, the sewage will flowed into three main parts of the sewage disposal unit. First, the sewage from the main sewer flowed into the settling tank. In the settling tank, the undecayed solids from the sewage will stay in the tank base. Then, it’s removed and burned. Then, polluted water from the settling tank is flowed into the pump house. Then the polluted water is pumped from the pump house to the sprinkler bed. In the sprinkler bed, the polluted water is flowed to the rotating arms. Then, the polluted water is sprayed rotationally to the top surface of sprinkler bed. Then, it’s purified by the filter which contain stones and micro-organism. Finally, the purified water is safe to be flowed into the river.