Method adopting ammonia carboxy chelating agent and festuca arundinacea to restore compost matrix heavy metals

Abstract

The invention relates to a method adopting an ammonia carboxy chelating agent and festuca arundinacea to restore compost matrix heavy metals, which comprises adding 20g of prepared compost in each culture dish with the diameter to be 6cm, and adding the ammonia carboxy chelating agent with the concentration of 5-20mmol/kg<-1> into compost matrix; then selecting full festuca arundinacea seeds, enabling the number of the seeds in each dish to be 50; placing the culture dishes where the seeds are sown in a laboratory to germinate the seeds, watering the seeds for one time respectively in the morning and in the evening each day, often exchanging positions of the culture dishes to guarantee conformity of illumination, enabling the illumination strength during the culture period to be 350-800 mu mol/m<-2>s<-1>, enabling the temperature in the laboratory to be 16 DEG C to 24 DEG C, and enabling the relative humidity to be 38-55%; and adopting a TAS-990 atomic absorption spectrophotometer to determine content of various heavy metals. According to experimental results, on the upper portion of the festuca arundinacea, Cr is concentrated maximally when the concentration of the ammonia carboxy chelating agent is 10 mmol/kg<-1>, Cd, Cu and Zn are concentrated maximally when the concentration of the ammonia carboxy chelating agent is 15 mmol/kg<-1>, and Pb is concentrated maximally when the concentration of the ammonia carboxy chelating agent is 20 mmol/kg<-1>. Accordingly, the concentration of nitrilotriacetic acid (NTA) should be changed in selection according to differences of different plants in concentrating the heavy metals.

Description

technical field [0001] [0002] The invention belongs to the application of garbage composting in the technical field of urban lawn planting, and relates to a method for repairing heavy metals in a composting matrix by using an ammonia carboxyl chelating agent in cooperation with tall fescue. Background technique [0003] In recent years, the problem of environmental pollution caused by domestic waste has become one of the focuses of widespread concern in society. With the improvement of people's living standards in our country, the amount of municipal solid waste is also increasing. Using domestic garbage compost as a lawn substrate can not only avoid the food chain, but also solve the problem of the way out of garbage. [0004] At present, my country has initially carried out scientific research on the use of domestic waste compost as substrate or fertilizer for garden green spaces. Garbage compost is usually added to the soil in the form of fertilizer, which can improve...

AI Technical Summary

Problems solved by technology

However, when using EDTA to coordinate phytoremediation, since EDTA and the complex formed by chelating EDTA and heavy metals have strong solubility and biotoxicity, and are difficult to be degraded by light, chemicals and organisms in soil, it is likely to be Cause environmental problems such as polluting deep soil and groundwater pollution

Images