Phosphorus and nitrogen removal wetland filler and preparation method thereof

Abstract

The invention discloses a phosphorus and nitrogen removal wetland filler and a preparation method thereof, and relates to the technical field of sewage treatment, the phosphorus and nitrogen removal wetland filler comprises a carrier and a wrapping layer, and the wrapping layer tightly wraps the carrier, the carrier is prepared from one of the following raw material components in parts by weight:70 to 80 parts of broken stone, 70 to 80 parts of pebble, 70 to 80 parts of gravel, 70 to 80 parts of silica and 70 to 80 parts of limestone, and the wrapping layer comprises the following raw material components in parts by weight: 10-25 parts of iron powder, 4-6 parts of cement, 0.4-0.6 part of a concrete early strength agent and 3-6 parts of water. The phosphorus and nitrogen removal wetland filler provided by the invention has an efficient adsorption and removal effect on phosphorus, the saturated adsorption rate of phosphate is greater than 200mg / kg, the internal porosity is greater than32%, and the specific surface area is greater than or equal to 1*10 <5> cm<2> / g, the chemical stability is good, and secondary pollution is avoided, the permeability is larger than or equal to 2*10 <-3 > m / s, the water head loss is small, the blockage problem is not likely to occur, microorganism attachment and plant growth are facilitated, and the ammonia nitrogen treatment effect is enhanced.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a phosphorus and nitrogen removal wetland filler and a preparation method thereof. Background technique [0002] With the rapid development of urbanization, the pollution of urban water bodies, rivers and lakes has become an urgent environmental problem. Nitrogen and phosphorus are one of the main threats to water quality. For example, the continuous blooms of Taihu Lake and Dianchi Lake are due to excessive total phosphorus. In recent years, with the implementation of pollution control measures in cities, although the main water quality indicators in the water system, especially organic pollutants, have been controlled, the risk of eutrophication is still very high. The removal rate of nitrogen and phosphorus by the secondary treatment process of the sewage plant Low, unable to meet the increasingly high control requirements for nitrogen and phosphorus in urban water enviro...

AI Technical Summary

Problems solved by technology

[0008] These existing technical schemes are unreasonable in the use of materials and the selection of material parameters, and it is difficult to meet the requirements of ecological purification facilities in terms of performance, and the production process requires a mold process, which increases the production cost. On the other hand, because it is a variety of The material is mixed and pressed, and the strength and durability are insufficient, but in actual engineering, materials that can operate continuously for more than 10 years are often required