The Research On Treatment Of A Pulp Industry Effluent By Charcoal

As the development of the pulp and paper industry these years, paper mills become the major industries causing water pollution. The most contaminative effluent in the paper mills is black water, which is produced by the steaming and braising process. Different pulp methods make different black water. But their common character is high chroma, high turbidity, high COD and high BOD. These characters make black to be severely pollutive and hard to treat.This work is trying to demonstrate the feasibility of the adsorbent treatment of black water by charcoal. It suggests that charcoal has big relative area and favorable absorbability. After the filteration, the charcoal whose granularity is between 75-150 μm gets the best goal to treat the COD of the black water. Via Bohart-Adams experiment, when the diameter of the columniation is 32mm, we get the critical charcoal height 58.5mm; the best velocity of flow 2.3mL/min; and the life-span of the charcoal 252min. Under the best condition, waste-water with COD 5060mg/L and turbidity 124.0NTU, after the treatment by charcoal, COD reduced to 1036mg/L, 79.5% COD wiped off; Turbidity reduced to 28.6NTU, 76.9% turbidity wiped off. Further more, charcoal is very abundance and cheap. So, adsorbent treatment by charcoal is proved to be a new effective and inexpensive method to treat blackwater.The charcoal dealing with wastewater can be made into water coal slurry. The energy, which comes from the water coal slurry, can provide much heat energy, so that it can decrease the cost of disposing wastewater.The boiler, which is used in the experiment, is Coronet Water Coal Factory. The technique are cycle reflow suspend burning. In this way, the let of soot, SO2, oxygen nitrogen, and solid matter will be the lowest.