economy

The Urban Management Science Institute under the Ministry of Urban Management has recently developed new technologies in succession, rendering great services to the protection of ecological environment.

The researchers improved the performance of composite flocculant for water purification using locally-available raw materials, thereby opening up a bright prospect for solving scientific and technological problems for ensuring the quality of domestic water.

In general, water production units spray flocculant in the rainy season to settle soil components in the river water to the bottom before filtering and sterilizing water to get domestic water. An important thing here is to lower the water turbidity below the standard level.

Based on a general analysis of the features and merits and demerits of some conventional flocculants, the researchers set the target of developing a new composite flocculant capable of further increasing purification capacity with lower production costs as they intensified their study.

In the course of this, they found out that a certain component in a kind of waste could be useful for settling some particles in the water with high efficiency. Based on it, they solved a problem of ensuring particle size of some materials to be added to a composite flocculant and confirmed the optimal mixing ratio that can be applied to objects with different degrees of water turbidity. They finally completed a method of getting the new composite flocculant and established an industrial production process for practical use.

The newly-developed composite flocculant for water purification was registered as a national sci-tech hit for its high utility in production and use with low production costs and high efficiency of purification.

The institute also developed a new technology of making an organic fertilizer from domestic sewage in cooperation with a relevant unit.

They succeeded in turning deposits from a process of purifying domestic sewage with bioactive substances and tubificid into the organic fertilizer.

In addition, the institute established a monitoring and control system capable of automatically controlling the sewage treatment process.

Their achievements were introduced into many units including the Chilgol Vegetable Farm in Mangyongdae District, Pyongyang.