The invention relates to a
sludge recycling method and biological water purification particles, and the
sludge recycling method comprises the following steps: strain screening; strain separation; strain screening and
fermentation; preparation of modified
biochar: mixing
sludge with
magnesium salt and iron salt, conducting heating and stirring, then adding an alkaline
reagent to adjust the pH value to 9-10, continuously conducting heating and carrying out a heat preservation reaction,
drying the product, crushing the product, conducting sieving with a
sieve, performing high-temperature
calcination, and conducting cooling to obtain modified
charcoal; and preparation of the biological water purification particles from a
fermentation suspension and the modified
biochar by an embedding method. The invention provides a new sludge
recovery thought, specific strains capable of efficiently purifying water can be rapidly screened out by utilizing sludge and
sewage,
biomass loading is carried out by utilizing the modified
charcoal, and the obtained biological water purification particles have an excellent water purification effect.