The invention provides a preparation method of
sludge ceramsite used for medium and low concentration
ammonia nitrogen wastewater treatment. The preparation method comprises the following steps: immersing
fly ash in a 3-6% NaOH solution at 20-30DEG C for 3-4d, washing the immersed
fly ash with deionized water, and
drying the washed
fly ash at 100-110DEG C;
drying excess
sludge and clay at 100-110DEG C;
drying above three raw materials, crushing the dried three raw materials, and sieving the crushed three raw materials for later use; fully mixing, by
mass, 30-60% of the preprocessed fly ash, 30-60% of the preprocessed excess
sludge and 10% of the preprocessed clay to obtain a dry material; adding a proper amount of deionized water to the dry material, uniformly stirring to prepare a 1-3mm blank, placing the blank in a tray, and drying the tray in a 110DEG C oven until the surface of the blank has no water; putting the dried blank in a
muffle furnace, heating the blank to 350-500DEG C, preheating the blank for 10-40min, heating the blank to 800-1100DEG C,
sintering the blank for 10-25min, cooling the obtained product in the furnace to 180-200DEG C, and taking out the cooled product to obtain the sludge ceramsite. The sludge ceramsite prepared in the invention has the advantages of low price, economical property, high efficiency,
environmental protection, and suitableness for treatment of medium and low concentration
ammonia nitrogen wastewaters.