The invention discloses a method for preparing a compound air purifying agent from secondary
settling tank
sludge of an urban domestic
sewage treatment
plant, and belongs to the field of preparation of air purifying agents. The method comprises the steps that urban
sludge is taken, pH is adjusted, a
hydrogen peroxide solution and
catalase are added and mixed, water-bath heating is conducted after ultrasonic oscillating is conducted, sealing protection is conducted, and then vacuum
filtration is conducted when a mixture is hot; filtered matter is air-dried, pH is adjusted, stirring mixing is conducted on the treated filtered matter and substances such as peptone,
ferric sulfate and carboxymethylcellulose, the obtained mixture is poured into a bamboo pole, the two ends of the bamboo pole are sealed, standing is conducted, air-
drying is conducted, the mixture is extruded into blocks, calcined, cooled and ground into particles, one half of the particles are put into the bamboo pole, a mixture prepared from substances such as
alocasia macrorrhiza and
epipremnum aureum, the other half of the particles is added into the bamboo pole, water is added, sealing is conducted, a power supply is switched on, baking is conducted through mild fire, a product is taken out and ground into particles, and the air purifying agent is obtained. The method for preparing the compound air purifying agent from the secondary
settling tank
sludge of the urban domestic
sewage treatment
plant has the advantages that the sludge is fully utilized for preparing the air purifying agent,
pollution of the sludge to the environment is solved, sustainable utilization of resources is achieved, and the product is safe and
environmentally friendly.