A project funded hanging chain skills to save the aerator can use intermediate structures jointly built earthen ponds structure (phosphorus pool, aeration tanks, sedimentation tanks, secondary aeration tank, in building a stable pool are free), you can using existing ponds and natural water systems, the pool can be described as an irregular shape formed according to the theoretical situation. A significant decline in construction costs, project funded approximately 30% -50% can be frugal. According to the geological conditions and the use of strange pleading, practice pool can be used clay soil compaction, riprap slope and laying HDPE impermeable membrane. (Optional field welding HDPE liner after laying, for the suppression of the test to ensure quality.) HDPE impermeable membrane impermeable role and use of life expectancy is higher than concrete, but the cost is lower than the concrete, so that projects funded decline, establish cycles . 2 frugal work in other costs associated with the activated sludge process, hoisting chain aeration system has a significant energy saving features: the premise of the traditional process in aerobic segment length of stay of eight hours, the gas-water ratio of 10: 1, while the Under the premise of hoisting chain aeration system in aerobic segment length of stay of 12 hours, the gas-water ratio can be arrived at 6: 1, thus greatly decrease the power consumption, thriftiness work expenses. There are two reasons: First, the long chain hanging bubble aeration occurs time stay in the water to avoid the area of ??traditional fixed aeration device is not saturated and oversaturated representation, therefore, oxygen usage rate, high power efficiency theory. Second, due to the movement of the aeration method constitutes the dissolved oxygen concentration in the aeration tank composed of waves distribution, so that the water there is bacteria group in the non-stable state. Under steady-state conditions and not on the biological treatment system attributed to primary influence on the system of microorganisms include microbial activity, ability to adapt to the external environment, particularly with respect function of composition and other microorganisms. Without a stable state will affect microbial activity forward, greatly advancing the disposal ability of microorganisms. 3 mobile repair protection facilitate hoisting chain aeration system all fasteners are in the water, so easy to repair, in case of continuous gas venting structures, aerator will be brought directly from the water surface to abort the protection and repair.