Method for purifying pig-breeding wastewater by manganese metal self-loaded biochar

Abstract

The invention discloses a method for purifying pig-breeding wastewater by using manganese metal self-loaded biochar. The method comprises the following steps: preparing manganese metal self-loaded biochar; carrying out pretreatment and solid-liquid separation of pig manure; blending pig-breeding wastewater; and purifying. The preparation of the manganese metal self-loaded biochar comprises the following steps: crushing corn straws harvested from manganese-rich soil, drying, carrying out high-temperature pyrolysis, cooling and grinding to obtain the manganese metal self-loaded biochar. In the step of blending pig-breeding wastewater, manganese metal self-loaded biochar is added into the pig-breeding wastewater from which solid substances are separated according to the weight ratio of (1: 500)-(1: 300); and in the purifying step, the water depth of the blended pig-breeding wastewater is maintained to be not more than 1.2 m, the water temperature is kept to be 10-55 DEG C, the speed is kept to be 100 r / min and the treatment time is kept to be 6-10 h. According to the method, the antibiotics and Cu<2+> in the pig-breeding wastewater can be efficiently, cheaply and synergistically removed, and the removal rates of the antibiotics and Cu<2+> are both greater than or equal to 90%.

Description

technical field [0001] The invention relates to a method for purifying pig raising wastewater, which belongs to the technical field of environmental protection, especially the technical field of wastewater treatment. Background technique [0002] After nearly 20 years of rapid development, my country has become the largest producer and consumer of meat, poultry, and eggs, with an annual output of about 3.8 billion tons of livestock and poultry manure. In order to accelerate the growth of livestock and poultry and reduce the occurrence of diseases, feed additives and antibiotics are widely used in the process of livestock and poultry breeding. In 2019, the "Report on the Use of Veterinary Antibiotics in China" released by the Ministry of Rural Agriculture mentioned that in 2019, 30,903.66 tons of veterinary antibiotics were used in China. Due to the limited absorption of livestock and poultry intestines, these antibiotics are usually excreted Into the breeding manure, result...

AI Technical Summary

Problems solved by technology

Due to the microbial toxicity of antibiotics, it is difficult for the biological water treatment process with significant economic benefits to operate efficiently and stably in the pig wastewater treatment, resulting in the problem that the effluent water quality is difficult to meet the standard

Therefore, physical methods and chemical methods are widely used in the treatment of pig wastewater. Chemical methods require a lot of actual consumption, which is not only economical, but also may cause secondary pollution due to the extensive use of chemical reagents.

Adsorption method is one of the most widely used physical treatment methods at present. It uses adsorbents with rich specific surface area to adsorb and fix antibiotics and heavy metals in wastewater. However, this method only realizes the transfer of pollutants, and does not completely eliminate and transform them. Pollutants, there is a large amount of adsorbent, and the adsorbent after adsorption saturation has the possibility of secondary environmental pollution

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