Experimental Study On Fur Production Wastewater Treatment By Using IC+O/A/O Process

Fur Production Wastewater at present is difficult to be treated,and it is a single process of tannery waste water treatment industry.Based on few research on the anaerobic treatment of fur production wastewater at present,this paper studied the treatment of fur production wastewater.Main research contents: experimental study on treatment of fur production wastewater by using IC,experimental study on treatment of fur production wastewater by using multi point O/A/O process and According to the approval document of the project environmental impact assessment,the experimental study on pretreatment of dyeing wastewater by Fenton oxidation and experimental analysis of flocculation phosphorus removal have been increased.The system test results show that under the influent COD concentration was 2500 mg/L³500 mg/L,and the NH₃-N concentration was 80 mg/L¹00 mg/L,through the treatment of pre aeration regulating tank,flotation tank and IC+O/A/O system processing and after the system was stable,the effluent COD concentration was 40 mg/L⁵0 mg/L,and the NH₃-N concentration was under 2.5 mg/L.The COD and NH₃-N concentration is stable and quite good to meet the“Discharge standard of water pollutants in the Mangqin River Basin”（DB 41/776-2012）.The experimental results on the treatment of fur production wastewater by using IC anaerobic reactor showed that the removal efficiency of COD was better,and anaerobic granular sludge microorganism could adapt to the wastewater quality.IC anaerobic reactor system in the influent COD concentration 500 mg/L¹200 mg/L experment conditions,after the experment was stable: The COD concentration of effluent was between 300 mg/L⁵00 mg/L,COD removal rate reached 65%,VFA concentration basically maintained at 1.8 mmol/L².2 mmol/L,ALK concentration basically maintained at 13 mmol/L¹8 mmol/L,pH of the effluent was kept in the range of 7.5⁷.9,and The concentration of SS was less than 200mg/L.The experimental results on the treatment of fur production wastewater by multi point O/A/O process show that COD and NH₃-N have good removal effect.The multi point O/A/O process under the experimental conditions that the COD concentration of influent between 300 mg/L⁵00 mg/L,NH₃-N concentration between 60 mg/L⁸0 mg/L,after the experment was stable that the COD concentration of effluent in 40 mg/L⁵0 mg/L,the removal rate of COD reached 85%⁹0%,COD totai organic load from the initial stage of 427.2kg/d stability reached 1678.56kg/d,COD sludge load of the first aerobic tank reached 0.2kgCOD/（kgMLSS·d）,the second reached 0.275 kgCOD/（kgMLSS·d）.The effluent NH₃-N concentration was stable below 2.5mg/L and the removal rate was stable at 97%⁹9% and The NH₃-N total organic load by early 72kg/d stable up to 287 kg/d.The effect of Fenton oxidation pretreatment on fur dyeing wastewater was significant.The experiment was carried out to analyze the 500 m L dyeing wastewater samples,and control the pH value of 3,the ambient temperature was about 50℃,and The optimal combination scheme was obtained: The dosage of FeSO₄·7H₂O was 3.5 mmol,molar ratio of [H₂O₂]/[Fe²⁺] reagent was 9:1 and The eaction time was 120 min.Under the above reaction conditions,the removal rate of COD was 65% and the chroma removal rate was about 83%.The experimental results of flocculation phosphorus removal showed that for 1L water sample,under the condition of inflow TP concentration at 1.69 mg/L,treated by 400 mg/L polyaluminium chloride,the removal rate of TP was 60% and treated by 300 mg/L poly aluminum chloride + magnesium chloride（1+1）,the removal rate of TP was 60%.And the proportion of organic phosphorus in the waste water was 56%,and the proportion of inorganic phosphorus was about 44%.And the removal efficiency of inorganic phosphorus treated by poly aluminum chloride（PAC）or poly aluminum chloride + magnesium chloride（1+1）was better.