Biochar-based multistage dam-type adsorptive sewage treatment method

Abstract

In a biochar-based multistage dam-type adsorptive sewage treatment method, an inclined sewage flowing passage is used, and a multistage charcoal dam is arranged in the sewage flowing passage; a preparation method of biochar used in the charcoal dam comprises the following steps: firstly, putting plant straw into a carbonizing furnace, and then in an anoxic state, controlling the temperature at 350-500 DEG C and carbonizing the plant straw to obtain the biochar; a first-stage charcoal dam is formed by mixing the biochar and plant fiber; a second-stage charcoal dam is formed by mixing the biochar and soil; a third-stage charcoal dam is formed by wrapping the biochar with industrial filter cloth; the sewage treatment method comprises the following step: at 5-40 DEG C, treating sewage in batches, wherein the sewage flows from a water inlet end of the sewage flowing passage at a flow speed of 0.45-0.55m<3> / m. Through arrangement of a water passage, in which the sewage flows, into the sewageflowing passage with height difference, and through arrangement of multiple biochar dams at different positions of the sewage flowing passage, the flow speed of the sewage is reduced and adsorptive filtration is achieved; the biochar-based multistage dam-type adsorptive sewage treatment method has the advantage of a good treatment effect.

Description

technical field [0001] The invention relates to a biochar multi-stage dam type adsorption treatment method for sewage, which belongs to the technical field of sewage treatment. Background technique [0002] Since the reform and opening up, with the continuous improvement of people's living standards, the demand for meat, eggs, and milk has increased rapidly, and the breeding industry has also developed rapidly. However, while meeting the needs of people's lives, with the continuous expansion of the scale of livestock and poultry breeding, the concentrated production and random dumping of a large number of livestock and poultry excreta have also brought increasingly prominent environmental problems. It is estimated that in 2016, the country produced about 3.8 billion tons of livestock and poultry manure, which is several times the amount of industrial and domestic waste. According to the first survey of pollution sources, agricultural sources accounted for the majority of my...

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Problems solved by technology

Livestock pollution has become the third largest pollution after industrial pollution and domestic pollution. At present, my country's livestock and poultry breeding industry has few supporting treatment facilities and low treatment levels. More than 90% of the farms have no comprehensive utilization and sewage treatment facilities.

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