Papermaking wastewater bio-decolorization method

Abstract

The invention relates to a papermaking wastewater bio-decolorization method. The papermaking wastewater bio-decolorization method belongs to a papermaking wastewater depth treatment decolorization technology. The papermaking wastewater bio-decolorization method is characterized in that 1, yielding water which is high-yield pulping papermaking integrated wastewater passing through thick and thin grilles and being subjected to secondary treatment and coagulation agent addition treatment is utilized as a treatment object, wherein the chemical oxygen demand (COD) of the yielding water is less than or equal to 150mg / L and the chroma is less than or equal to 80 times; 2, the papermaking wastewater bio-decolorization method utilizing active carbon as a decolorization bacterium carrier is carried out in a special airlift biochar circulation reactor, and in other words, active carbon, secondary yielding water and compressed air are put in the same reactor so that decolorization depth treatment is realized; and 3, in a decolorization process with addition of white rot fungi and rhodopseudomonas, other chemical preparations are not needed, wherein a COD removal rate can reach above 50%; a chroma clearance rate can reach above 80%; and a higher clearance rate can be obtained when a coagulant addition amount is increased and reaction residence time of treated wastewater in a reactor is prolonged. The papermaking wastewater bio-decolorization method utilizes active carbon as a decolorization microbe carrier and compressed air as a power source of oxygen and active carbon bed expansion, and realizes flowing of decolored wastewater and compressed air in active carbon, a dynamic balance between active carbon adsorption and adsorbed substance biodegradation, continuous water yielding and stable water-yielding operation.

Description

technical field [0001] The invention relates to an advanced treatment technology for papermaking wastewater, in particular to a biological decolorization method using activated carbon as a biological carrier after secondary biological treatment of high-yield pulp and papermaking wastewater. Background technique [0002] The paper industry is a large water user, ranking third in the country's industrial water intake after thermal power and textiles. In terms of the total pollution load of wastewater, the paper industry is larger than thermal power and textile industries, and has become one of the main sources of pollution in water areas. The paper industry must regard water conservation as an important task for sustainable development, and take practical measures to reduce the amount of clean water per unit of product and the total amount of clean water consumed. As far as the industry is concerned, the water consumption of my country's paper industry is still high consumptio...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of high decolorization cost and secondary pollution caused by traditional chemical or physical adsorption methods, and provide a low-cost decolorization method for biochar