Resource and energy recovery-based sewage treatment method

Abstract

The invention relates to a resource and energy recovery-based sewage treatment method, and provides a sewage treatment system. The sewage treatment system comprises a pre-treatment system, a microalgae reaction tank, an online environment monitoring system, a ceramic membrane and algae separation system and an anaerobic resource recovery system. The method for carrying out sewage treatment by utilizing the sewage treatment system comprises the following steps of: enabling pre-treated sewage to enter the microalgae reaction tank, and reducing the concentrations of nitrogen, phosphorus and organic matters in the sewage through biochemical reaction of microalgae under a controlled environment condition; and carrying out separation on algae-water mixed solution through the ceramic membrane andalgae separation system, discharging qualified effluent, enabling a little suspension algae solution to flow back, carrying out secondary concentration on most of the algae solution to enter the anaerobic resource recovery system so as to carry out anaerobic digestion reaction, and respectively generating electric energy, fertilizer and ammonium hydroxide from generated methane and residual digestion solution through a marsh gas generating set, a struvite recovery device and an ammonia nitrogen recovery device. The system is good in sewage treatment effect and high in nitrogen and phosphorusrecycle rate, and is capable of realizing resource and energy balance of sewage treatment.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a treatment system and method for removing nitrogen and phosphorus in sewage, in particular to a treatment system and method suitable for general domestic sewage. Background technique [0002] With the rapid development of my country's society and economy, the amount of sewage discharge continues to increase, and the construction of sewage treatment facilities is becoming the key promotion work of the government's environmental protection department. At present, the traditional biological treatment technology represented by the activated sludge method is the mainstream process of sewage treatment in China, but its disadvantage of "energy consumption" makes the construction investment and operation cost of sewage treatment relatively high, which restricts the popularization of sewage treatment plants and cover. [0003] During the operation of the traditional activated s...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a treatment system and treatment method for treating sewage with microalgae in order to overcome the problems of high energy consumption and difficult treatment of by-products in the existing sewage treatment technology. The system can ensure efficient removal of pollutants in sewage At the same time, realize the resource utilization and energy utilization of nutrients such as nitrogen and phosphorus in sewage

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