Biogas slurry concentrated solution compound fertilizer and method for cultivating vegetables by using same

Abstract

The invention relates to a biogas slurry concentrated solution compound fertilizer and a method for cultivating vegetables by using the same. The biogas slurry concentrated solution compound fertilizer is prepared from the following raw materials in parts by weight: 950 to 1050 parts of a biogas slurry concentrated solution, 90 to 110 parts of a nitrogenous fertilizer, 240 to 260 parts of a phosphatic fertilizer and 100 to 120 parts of a potash fertilizer. The biogas slurry concentrated solution is prepared by the following steps: (1) introducing biogas slurry into an aerobic bioreactor, and treating under the action of aerobic activated sludge to obtain aerobic effluent; (2) separating the aerobic effluent through an ultrafiltration membrane to obtain ultrafiltration membrane effluent; and (3) concentrating and separating the effluent of the ultrafiltration membrane through a reverse osmosis membrane to respectively obtain a concentrated solution and a permeate solution, and the concentrated solution is the biogas slurry concentrated solution. The biogas slurry concentrated solution compound fertilizer can significantly improve the yield and nutritional quality of pakchoi and increase the content of chlorophyll, soluble sugar, vitamin C and trace elements of the pakchoi; the content of nitrate in the pakchoi can be reduced, heavy metal accumulation in the pakchoi is avoided, soil heavy metal pollution is small, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of biogas slurry recovery and utilization, and in particular relates to a biogas slurry concentrated liquid compound fertilizer and a method for using it to cultivate vegetables. Background technique [0002] With the rapid development of my country's animal husbandry, while ensuring the growing demand for animal products, a large amount of livestock manure and sewage have also been produced, and the pollution of livestock and poultry manure has become increasingly prominent. At present, the annual production of livestock and poultry manure in the country is about 3.8 billion tons, which is the most important livestock and poultry farming waste. According to statistics, the chemical oxygen demand (COD) emitted by my country's livestock and poultry breeding industry in 2010 was 12.6826 million tons, accounting for 42% of the country's total, accounting for 96% of the total emissions from agricultural sources; total nit...

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Problems solved by technology

[0005] The literature "Effects of Biogas Slurry on Soil Quality and Yield and Quality of Chinese Cabbage, Huang Jieying, etc." used biogas slurry fermented from large-scale livestock and poultry breeding manure sewage as organic fertilizer, and found that the application of biogas slurry can increase the yield of Chinese cabbage and promote the growth of Chinese cabbage. The absorption of mineral elements can increase the content of Vc and soluble sugar in pakchoi. However, the contents of Cr, Zn and Cd in the soil and pakchoi after the application of biogas slurry all exceed the standard, indicating that the heavy metals in the biogas slurry will cause differences in soil and plant systems. Accumulate to a certain extent, thus creating certain environmental pressure, even endangering human health

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