New process for treatment of APMP pulp-making wastewater

Abstract

The invention provides a new process for treatment of APMP pulp-making wastewater. The new process is applicable to comprehensive wastewater produced by using raw materials of poplar, eucalyptus and a variety of fast-growing timbers for producing pulp with high yield by adopting the APMP or the PRC-APMP pulp-making process. The new process is different from the traditional treatment process, aspergillus niger is adopted for directly carrying out biological pretreatment on the pulp-making waste liquid without the pretreatment, then the flocculation treatment technology is adopted for further reducing COD and suspended substances, the absorption-flocculation role of biological pretreatment thalli is fully utilized for improving the overall treatment effect, and the flocculation treatment is carried out by adopting polyaluminium chloride and polyacrylamide. Most of the waste liquid can be reused in process steps of material preparation, pulp washing, papermaking and the like after the biological pretreatment and the flocculation treatment, if the waste liquid needs to be drained, the deep treatment still needs to be carried out, the deep treatment can adopt absorption-flocculation, wet oxidation, catalytic oxidation, membrane treatment and other technologies for carrying out treatment, and the waste liquid can be drained after achieving the standard.

Description

Technical field: [0001] The invention belongs to the field of industrial wastewater treatment, and in particular relates to a treatment process for APMP pulping wastewater. Background technique: [0002] The AMPM pulping process is a patented technology developed by the American SPROUT-BAUER company in the early 1990s. Its main principle is to extrude the raw material with a high compression ratio screw before refining to strengthen the soaking of the chemical solution, and then add h 2 o 2 The bleaching reaction with NaOH and other chemicals saves a series of equipment for bleaching after refining. It is one of the most advanced high-yield pulping methods integrating chemical treatment and mechanical treatment. The APMP method has many advantages such as low power consumption, high pulp whiteness, long pulp fiber, less environmental pollution, low investment, and small footprint, and is especially suitable for hardwood pulp. In the "Eleventh Five-Year Plan" of our countr...

AI Technical Summary

Problems solved by technology

The conventional biological treatment process is mostly flocculation (sedimentation) treatment + biological treatment, and biological pretreatment + flocculation treatment is rarely seen, and the combination of Aspergillus niger biological pretreatment + flocculation treatment process has not been reported.