Method for producing saline-alkali soil improving agent by utilizing dewatered sludge of domestic sewage plant

Abstract

The invention relates to a method for preparing a saline-alkali soil improving agent by utilizing dewatered sludge of a domestic sewage treatment plant and is characterized by effectively utilizing the sludge of the sewage treatment plant, reducing saline and alkali of modified saline-alkali land, dissolving salinity and accelerating the soil desalinization so as to achieve the method for preparing the saline-alkali improving agent meeting the requirements of greening, agricultural production and other planting requirements. The dewatered sludge, cottonseed hull powder, sugar residue mud, xylitol residue and other organic matters are fully utilized, microbial halophilic bacteria and other beneficial florae are added, mixing and fermentation are performed, and sulfur powder, calcium carbonate, ferrous sulfate and other inorganic mineral matters are further added after complete decomposition, thereby preparing the saline-alkali improving agent; and the saline-alkali improving agent can be suitable for improving saline-alkali soil with the ph of less than 11 and the salinity of less than 1.5% and enable the soil to achieve the requirements of agricultural production or a green environment through one to two planting cycles. The proportion of all the raw materials can be regulated according to the saline and alkali content of the local saline-alkali soil, thereby being suitable for the various types of the saline-alkali land.

Description

technical field [0001] The invention relates to a method for preparing a saline-alkali soil improver from the dewatered sludge of a domestic sewage treatment plant, which is characterized in that the sludge from the sewage treatment plant is effectively used to reduce the salinity of the improved saline-alkali land, dissolve salt, and accelerate soil desalination, so that it can achieve greening, agricultural production, etc. Planting requires a method of making a saline-alkali modifier. Background technique: [0002] Saline-alkali land contains excessive salt and alkali components. The coexistence of salt and alkali determines the complexity of saline-alkali land improvement. Different geographical regions have different saline-alkali content. In coastal areas, saline-alkali land is widely distributed and has high salt content. The altitude is low, the groundwater level is high, the salinity is high, the soil has poor permeability to sun-dried salt all year round, the soil ...

AI Technical Summary

Problems solved by technology

[0002] Saline-alkali land contains excessive salt and alkali components. The coexistence of salt and alkali determines the complexity of saline-alkali land improvement. Different geographical regions have different saline-alkali content. In coastal areas, saline-alkali land is widely distributed and has high salt content. The altitude is low, the groundwater level is high, the salinity is high, the soil has poor permeability to sun-dried salt all year round, the soil temperature rises slowly, the nutrient release is slow, the permeability coefficient is low, and the terrain is low and flat. In the dry season, the surface soil is often white , even salt crust, soil hardening and cracking, high mineralization, alkali is corrosive, destroys plant cell tissue, endangers plant growth, poor site conditions, serious return to alkali, hinders normal physiological activities of plants, inhibits growth, High alkalinity can directly rot the roots of trees and lead to death

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