Activated sludge and microalgae coupling granulation system for wastewater treatment and its construction and operation method

Abstract

The invention discloses an activated sludge and microalgae coupled granular system for waste water treatment and an establishment and operation method thereof. The activated sludge and microalgae coupled granular system is established for purifying sewage and recycling energy. The system comprises microalgae and a granule sludge carrier thereof. The settling time at the culture stage is controlled to range from 1 min to 100 min, and the drainage ratio of a reactor at the culture stage is controlled to range from 10% to 90%. Shear force formed through aeration or stirring is controlled to range from 0.1 cm / s to 2 cm / s, settling time at the actual waste water treatment stage is controlled to range from 0.5 min to 30 min, the drainage ratio at the actual waste water treatment stage is controlled to range from 10% to 90%, and shear force formed through aeration or stirring is controlled to range from 0.1 cm / s to 3 cm / s. The system can treat various kinds of waste water, and remaining sludge can serve as raw materials for preparation of biodiesel and biogasoline, hydrogen production by fermentation and methane production by fermentation, and preparation of bio-organic fertilizer, biochar and the like.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to an activated sludge and microalgae coupled granulation system for wastewater treatment and a construction and operation method thereof. Background technique [0002] In the 21st century, there are two major problems that need to be solved urgently for the sustainable development of human society: environmental pollution and energy crisis. Water resource pollution is the main component of environmental pollution. With the continuous increase in population and the acceleration of urbanization, coupled with the comprehensive influence of technological level, short-term interests, and imperfect legal system, water resource pollution has become a problem in recent years. How to remove excess nitrogen, phosphorus and other pollutants in water efficiently and at low cost is an important problem in water pollution control. At the same time, the survey pointed out that the global oil and natu...

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Problems solved by technology

However, there are still some key problems in this process that need to be further resolved: 1) In the suspended bacteria-algae symbiosis system, the microalgae settling efficiency is poor, and it is not easy to harvest and separate, which has a great impact on energy recovery costs. Microalgae harvesting is second only to The second largest cost consumption in the cultivation process; 2) If the sludge dosing ratio is low in the suspension system, the treatment effect and impact resistance of the system will be reduced

When the proportion of sludge dosage is high, the penetration of light in the flocculent activated sludge is weak, and the specific surface area of ​​microalgae receiving light in the photochemical reactor is small, which is not conducive to the growth of microalgae; 3) in the immobilized bacteria In the algae symbiotic system, it is difficult to develop and select carrier materials that are non-toxic, porous, insoluble in the treatment medium, difficult to be biodegraded, and cheap and easy to obtain, resulting in high actual cost of immobilization systems and poor reusability , and the physical and chemical materials used in the immobilization process will affect the subsequent energy extraction and recovery

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