Fire on Top

One of Jakarta’s famous monuments is Monumen Nasional or publicly known as Monas. This 137 centimeters high monument symbolizes the fight of Indonesian people for its independence against the Dutch. The monument is topped with a bronze fire flame statue covered in 35 kilograms of pure gold. It symbolizes the spirit of Indonesian people that never dies. The fire flame is placed on the top terrace. From inside of this terrace we can have the bird-eye view of Jakarta. Monas also has a diorama room inside the base of the monument. The dioramas show the history of Indonesia. Bendera Pusaka, the first Indonesian flag sewed by the first first-lady of Indonesia, is also kept inside the monument along side with the Indonesian independence declaration by the first president and vice president.

Sewage Disposal System

Before sewage from industries is thrown to the river, it needs to be processed to keep the environment safe from chemical or dangerous waste. There are 3 steps until the sewage become a purified water that can enter the river. The first step is done in the settling tank. In this part, the sewage or the polluted waste is run through the main sewer pipe to the settling tank. The polluted water is pumped to the pumped house while the solid sewage that has not decayed is removed and burned in the settling tank. From the pumped house, the remaining waste is pumped to the sprinkler beds. The sprinkler beds consist of brickwork, filter of stones and microorganism, rotating arm, and jets of polluted water. In this step, the polluted water is purified through the filter and rotating arm. After the water is purified, the water can enter the river.

How to Extract Methane Gas from Household Waste

Since technology keeps developing, now there’s a system that is capable of extracting methane gas from household waste. This system is divided into five stages. Firstly, the household waste is put into the warming bed and it will be decayed there. The decayed waste or anaerobe will create methane gas while some of the waste becomes fertilizer. Next, that methane gas goes to the dirt trap. In this stage, the methane gas will be settled so the dirt contained in the gas will be separated. After that, the gas goes to gas indicator. Water in this stage helps the gas to be purified and so methane bubbles can be seen in this stage. Then, the gas goes to the forth stage, which is pressure release. Excess gas occurs when the pressure is high. The last stage of this system is called gas holder. There are inner tubes to hold the methane gas and there are weights above the inner tubes in order to increase the gas pressure. Whenever the gas is needed, the tap can be opened so the methane gas will be released through this tap.