Method for preparing active carbon by waste water sludge from chemical pulping and paper mill

Abstract

A method for preparing active carbon by waste water sludge from chemical pulping and paper mills relates to the following steps: drying, pulverizing and screening papermaking waste water sludge, performing dipping treatment by potassium carbonate or sodium carbonate or sodium hydroxide or potassium hydroxide solutions for 10-30 hours, adding into an activation furnace, heating to 500-900 DEG C under an anaerobic condition for pyrolysis, wherein the whole course takes 1-4 hours and the heating rate is 5-20 DEG C / min; rinsing and drying the activated product with distilled water to obtain active carbon; wherein the alkali liquor is recyclable. The active carbon prepared by the invention has a methylene blue adsorption value of 4-9 mg / 0.1 g, is applicable to waste water treatment in paper mills, and has good effect; during the active carbon preparation process of the invention, no waste water or waste gas is discharged. The invention solves the disposal problem of papermaking sludge, and the prepared active carbon can reduce cost of papermaking waste water treatment. The invention belongs to the technical field of pulping papermaking.

Description

Technical field: [0001] The invention belongs to the technical field of pulping and papermaking Background technique: [0002] According to statistics in 2005: the total production of paper and cardboard in my country is 54.04 million tons, the wastewater discharge is 3.67 billion tons, accounting for 17% of the national wastewater discharge, of which the COD discharge is 1.597 million tons, accounting for 32.4% of the national COD discharge , the paper industry is still a major polluter in the country. In order to solve the pollution problem in the paper industry, the state has formulated a strict wastewater COD discharge standard of less than 100mg for the paper industry. For this reason, the existing papermaking enterprises all have supporting sewage treatment systems. As a result, a considerable part of the 1.597 million tons of COD has become solid waste. The problem is that no matter what disposal methods are used for papermaking sludge, such as landfill, incineratio...

AI Technical Summary

Problems solved by technology

The invention can solve the problem of papermaking sludge disposal, and the prepared activated carbon can reduce the cost of papermaking wastewater treatment