Study on the separation of recycled plastic film residual mixtures from cotton field by the composite technology of insect combined with the decomposing fungus.

[Objectives] Residual film in farmland is the main source of white pollution. In the recycling and utilization of residual film, Farmland residual film accounts for about 10.00%-20.00% of the residual film recovery, how to separate theresidual film from the residue and fiber mixture has always been a "stuck neck" problem that plagues the recycling and reuse of residual film. The development of technology that uses insects to transform agricultural and animal husbandry wastes provides ideas for solving this problem. [Methods] There are 6 treatments were set up, which are urea + fungus, CK, pig manure + fungus, fungus, cow manure + fungus, insect dung-sand + fungus, and carried out a 30-day decomposing pretreatment under outdoor natural temperature and light conditions. Thereafter, the 3rd instar larva of Proteatia brevitarsis Lewis were put into the fermentation material to separating the recycled plastic film residual mixtures. The separation effect was measured by measuring the proportion of residual membrane in the mixture, the transformation capability of larvae and the residual membrane on the surface accounted for the total. [Results] The highest fermentation temperature of three organic accessories (pig manure, cow manure, insect dung-sand)+ fungus treatments has exceeded 55 °C, the fermentation is more intense, and the decomposing effect is better; the 3rd instar larva of P. brevitarsis Lewis can grow and cocoon normally in the six decomposed material, And can get insect dung-sand equivalent to 57.60 times to 193.10 times increase in weight, the three treatments of organic accessories + fungus performed the best; Special way of the feeding and back-walking activities of the 3rd instar larvae of P. brevitarsis, The residual membrane on the surface of each treatment accounted for more than 42.58% ±0.94% of the total, The best is cow dung + fungus treatment, up to 54.11%±7.60%; the fermentation process all contributes to the decomposition and improvement of the proportion of residual membrane in total residue mixture, the transformation and separation of the larvae of P. brevitarsis can greatly increase the proportion of residual membrane in the residue. Under the compound of insects and fungus, the three treatments of organic accessories + fungus can increase the ratio of residual membrane to more than 4.8 times. According to a rough estimate, the profit that can be created by recycling the residual membrane mixture per ton of cotton field is about 300 yuan. [Conclusion] The insect and fungus compound technology can not only realize the value-added separation of the residual membrane in the residual membrane recovery mixture. It also can improve the resource utilization of manure (i.e, cow manure) and the insect dung-sand which has the application potential in organic fertilizer, and providing a new exploration direction for cracking the residual membrane pollution control in the Xinjiang cotton area, and it has initial application potential. [ABSTRACT FROM AUTHOR]