Study On The Treatment Of Crude Tanning Wastewater And Absorbent Mycelium Bioabsorbent

Tannery industry has brought benefits to society and met the people’s needs for leather products. But, at the same time, wastewaters from the tannery industry have caused severe environmental pollution and the waste of chrome resource. How to recycle high-purity chromium sludge at low price was a serious problem for the tannery industry. As the extensive use of bio-adsorbents, how to realize resource treatment of the abandoned bio-adsorbents was also an urgent problem.As to the wastewater from the sewage farm in the tannery industrial area of Xinji city in Hebei, precipitation, coupling of flocculation and precipitation, new silicon-ferroalloy were used to recycle chrome from tannery chrome effluents in the paper. The purity of chromium sludge was more than36.0%,65.0%,80%respectively, about twice as much as the original purity (27.7%) of chromium sludge. The chromium sludge after disposal could be recycled in certain fields, and also reduced environmental pollution.The mycelium bio-adsorbents for heavy metal ions have better selectivity and higher adsorption capacity, which were used more and more extensively. But because of the limited recycled batches, the mycelium bio-adsorbents were finally abandoned with high heavy mental ions. In order to avoid the second environmental pollution, using anaerobic fermentation the abandoned mycelium adsorbents was dealt with as a resource treatment in this paper. The results showed that the highest cumulative methane yield was about470mL/gVS, and the top reduction rate of total TS was about60%. Besides, the anaerobic fermentation could be able to transform heavy metal ions into more stable states and the highest transformation rate was80%which reduced the harm to the environment sharply.