Processing method for processing chrome-containing leather solid waste

Abstract

The invention relates to a processing method for processing chrome-containing leather solid waste, and belongs to the technical field of chemical engineering and the environment. According to the method, firstly, chromium salt in leather is eliminated through a sodium hydroxide solution and modified titanium dioxide; then the chromium slat is recycled through high-temperature evaporation; and finally, decomposition of the leather is accelerated through high-temperature fermentation of a mixture of activated sludge, penicillium raciborskii fermentation liquid and sea mud of sewage treatment plants, and nutrient-rich soil fertilizer is formed. The processing method is simple and easy to implement in the actual operation process and does no harm to human bodies and the environment; the nutrient-rich soil fertilizer is formed in the leather decomposition process; the waste is utilized; and the soil fertilizer reaches the use standard of agricultural fertilizer, and the decomposition rates reaches up to 92% or above.

Description

technical field

[0001] The invention relates to a treatment method for treating chromium-containing leather solid waste, which belongs to the technical field of chemical industry and environment. Background technique

[0002] In addition to wastewater pollution in the tanning industry, there are also solid waste pollution from different process stages, such as slag, shredded leather, trimming scraps, chrome tanned leather grinding and smoothing leather scraps, etc., as well as tanning sludge and sediment. The world produces 600,000 to 800,000 tons of leather solid waste every year, 75% of which are chromium-containing chromium leather scraps. In my country, the annual discharge of leather solid waste is about 280,000 tons, of which 70% is Chromium waste. If not recycled, some of the chromium ions in it end up in the water. Trivalent chromium ions are protein coagulants, which can stimulate the human digestive tract, respiratory tract and skin. High concentration of trival...