Method for producing liquid mulching film from potato starch waste slag and liquid

Abstract

The invention aims to research, develop and produce liquid mulching film from potato starch waste slag and liquid. In a potato starch production process, a large amount of waste slag and liquid is produced. The long-termed piling of the waste slag and the direct discharge of wastewater severely affect the surrounding environment. Because the waste slag contains a large amount of water and the waste liquid contains a large amount of organic materials, the treatment cost of pure physical, chemical and biological processes is high, and the benefit is low. For the two properties of the waste slag and liquid, the method uses the characteristics of the waste slag and liquid of high organic material content in agriculture, and produces the waste slag and liquid into an airtight protective agent capable of being spraying on the soil surface through the treatment of film former, stable synthetic agent, crosslinker, initiator, fungicide and endothermic agent formulated by dissolving the waste liquid after the high-temperature pasting of the waste slag; and the temperature of the soil with the protective agent sprayed on is improved, the water evaporation is weakened, and the effect equal to that of mulching film covering is achieved. When being used together with weedicide and NPK fertilizer, the method has multiple benefits, such as weeding, fertilizer application and nutrient release.

Description

Technical field [0001] The invention relates to a method for producing liquid plastic film by using waste residue and waste liquid produced in the potato starch production process as raw materials, and belongs to the field of agricultural product deep processing waste utilization for agricultural plastic film production. Background technique [0002] In the production process of potato starch, a large amount of waste residue and waste water rich in starch, cellulose, protein, tannin and resin will be produced. For every 1000kg of potatoes processed, about 770kg of watery waste residue will be discharged, equivalent to 150kg of dry residue, and about 1000kg-1500kg of waste water will be discharged. The COD of water quality is as high as 20000-40000mg / L. [0003] At present, potato production enterprises pile up waste residues around the factory area. Except for a small part that is directly used by farmers in the factory area as livestock feed, most of them are piled up for a...

AI Technical Summary

Problems solved by technology

However, in production practice, the use of potato starch waste to directly feed livestock is not widely accepted by farmers due to its perishability and poor palatability.

Dehydration, drying, and granulation of potato starch slag are directly processed into pelleted feed. Due to the low protein content, the high cost of dehydration and drying processing is not widely used by enterprises, and the conversion resistance is large.

[0004] Due to the high COD of potato starch production wastewater, it is difficult to treat. Domestic potato companies have adopted various treatment methods but the effect is not good. For example, adding chemical flocculants is expensive, and the COD can only be reduced to 4000mg / L-5000mg / L. ; The use of aerobic aeration treatment in the oxidation pond has high operating costs, large environmental disturbances, and unsatisfactory treatment of water quality; the use of upflow anaerobic sludge bed reactor (UASB) treatment can generate biogas for recycling, but the treatment of water COD is higher than 1000mg / L, it needs to be equipped with multi-stage adsorption filter or aeration tank for secondary treatment

[0005] Because the waste residue contains a lot of water and the waste liquid contains a lot of organic compounds, the simple physical, chemical and biological treatment costs are high and the benefits are not high.