Biochar-enhanced grass blanket for remediating contaminated sediment and preparation method thereof, and method for remediating contaminated sediment

A method for preparing a biochar-enhanced grass blanket for remediating contaminated sediment, comprising:

• immersing a porous carrier in a starch adhesive solution and a porous biochar suspension sequentially to obtain a carrier loaded with a biochar on a surface;
• culturing the carrier loaded with a biochar on a surface in a culture solution inoculated with an activated sludge to obtain a surface-functionalized carrier;
• mixing a submerged plant seed with water, and adding the surface-functionalized carrier thereto to obtain a carrier deposited with the submerged plant seed;
• and
• subjecting the carrier deposited with the submerged plant seed to germination in a nutrient solution to obtain the biochar-enhanced grass blanket for remediating contaminated sediment;
• wherein
• the nutrient solution comprises the following components by concentration:
• 10 mg/L to 20 mg/L of urea, 40 mg/L to 80 mg/L of calcium nitrate, 40 mg/L to 80 mg/L of potassium nitrate, 5 mg/L to 8 mg/L of ammonium dihydrogen phosphate, 20 mg/L to 30 mg/L of magnesium sulfate, 2 mg/L to 5 mg/L of an ethylenediaminetetraacetic acid (EDTA) sodium salt, 0.01 mg/L to 0.05 mg/L of boric acid, 0.02 mg/L to 0.05 mg/L of manganese sulfate, 0.02 mg/L to 0.05 mg/L of zinc sulfate, 0.02 mg/L to 0.05 mg/L of copper sulfate, and 0.02 mg/L to 0.05 mg/L of ammonium molybdate;
• and
• the germination is conducted at a temperature of 25° C. to 30° C. for 30 days to 50 days.