Preparation method of denitrification and dephosphorization type filter material capable of quick start

Abstract

The invention relates to the technical field of biological filter materials, in particular to a preparation method of a fast-starting denitrification and phosphorus removal type filter material. The preparation method of the fast-starting denitrification and phosphorus removal type filter material, the steps include: sieving concrete block waste; preparing Thiobacillus denitrification bacteria suspension, soaking the concrete block waste and drying naturally; , heavy calcium powder, pyrite, lime, and gypsum are crushed and sieved according to the weight percentage to obtain a premix; the concrete block waste ball is used as a core, and the premix is ​​used as an outer coating for granulation, and the core is Roll coating the premixed material to obtain raw material balls; autoclaving them to obtain a nitrogen and phosphorus removal type filter material that can start quickly. The invention provides a method for preparing a quick-start denitrification and dephosphorization type filter material, which effectively recycles the autoclaved aerated concrete block waste and makes a high value-added denitrification and dephosphorization filter material, The start-up period is short, the additional amount of carbon source is reduced, and it has high economic and environmental benefits.

Description

technical field

[0001] The invention relates to the technical field of biological filter materials, in particular to a preparation method of a fast-starting denitrification and phosphorus removal type filter material. Background technique

[0002] Autoclaved aerated concrete block is a kind of porous concrete block made of fly ash, lime, cement, gypsum, slag, etc., through the process of batching, mixing, pouring, static stopping, cutting and high-pressure steam curing. Concrete products, in the process of concrete production, will produce about 1~3% waste, including defective products, leftovers, etc., a small part of which is mixed in mortar for reuse, and most of them are disposed of as construction waste, causing Great waste of resources. Autotrophic microbial denitrification technology for removing nitrate in water is a new type of biological denitrification technology, which means that under anoxic or anaerobic conditions, the related denitrification Thiobacillus deni...