Micro-nano bubble flocculation-air flotation process

Abstract

The invention relates to a new technology of micro-nano bubble flocculation-air flotation. The micro-nano bubble introduction system of the present invention is connected to the aeration head, the PAC dosing system and the PAM dosing system are connected to the source water lifting system, the source water lifting system is connected to the water distribution head, and the lifting bucket and lifting impeller are arranged in the middle of the flocculation-air flotation area , the lifting impeller is connected to the motor; the lower part of the flocculation-air flotation area enters the water distribution area, the upper part of the inclined tube area is connected to the water outlet, and the lower part is connected to the concentration area. The invention overcomes the problems of poor mechanical flocculation effect, large dosage of PAC agent, additional addition of PAM coagulant and environmental pollution caused by high-efficiency precipitation technology. The present invention utilizes the micro-nano bubbles to suck air into the pump through the suction of the multiphase flow pump, and generates them through the high-speed cutting of the impeller, and can also be generated by using a special micro-nano bubble generating device. Compared with the bubbles released by traditional pressurized tanks, micro-nano bubbles have the characteristics of small bubble size, large specific surface area, high adsorption efficiency, and slow rising speed in water.

Description

technical field [0001] The invention relates to a new water purification process that replaces the traditional mechanical flocculation technology, belongs to the urban and industrial water purification (sewage) treatment industry, and particularly relates to a new micro-nano bubble flocculation-air flotation process. Background technique [0002] In recent years, with the rapid development of urban scale and the rapid advancement of regional water supply, the demand for water supply has continued to rise. At the same time, with the promulgation and implementation of my country's "Drinking Water Hygienic Standards" (GB 5749-2006), water quality standards are also improving. It is difficult to meet the water quantity and water quality requirements at the same time by using conventional sedimentation, filtration and disinfection treatment processes. Under this situation, new high-efficiency coagulation sedimentation technology has been paid more and more attention. [0003] Befo...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that the mechanical flocculation effect is poor. In actual operation, the dosage of PAC agent is large, and additional PAM coagulant is needed. In addition, when algae multiply in spring and summer, the quality of effluent water will deteriorate, and return sludge is easy to produce. Corruption and deterioration, release of bad gas and other bad substances, causing environmental pollution problems

However, algae removal is difficult to solve by the commonly used methods (such as adding algicide, pressure algae removal technology, etc.), because the algae will accumulate in the bottom sludge after being killed, and the fermentation will become smelly, resulting in poor quality of the return sludge. , affecting the water quality of the effluent

Images