The Technology Of Treatment Of Sulfur-containing Organic Wasterwater And Recovery Of Surfur Using Biochemical System

Sulfur-containing wastewater is a serious environmental pollution, environmentalrisks, need to deal effectively with the environment containing sulfate wastewater, andsulfur as a resource recovery has gradually taken seriously. In the sulfate-containingwastewater treatment works, facing the high cost of processing, sulfur recovery and lowpurity and energy consumption, difficulty, in order to address and overcome thesedifficulties in the engineering, Analysis and discussion of the three difficulty, Proposeda low energy consumption, and the compliance of the treatment effect and a high-puritysulfur recovery technology. Constructive advice and guidance in the engineering sense.Microbial fuel cell, using bacteria as catalyst, is a device converting chemicalenergy into electric energy. Recovering energy from organic wastewater in the form ofclean energy source, MFC has become an integrated technique involving wastewatertreatment and power recovery. Therefore, it has a great promising future in application.Sulfate contained in wastewater serving as a heavy pollutant is required to be efficientlytreated due to its potential risk to environment.To achieve effective sulfur-containing waste water processing and sulfur recovery,combined with the MFC and power-assisted electrochemical techniques, discussessulfur-containing wastewater treatment to the energy maximize use, and improve thesulfur recovery efficiency. Explore the different operational status of MFC reactor andorganic substrate, Combined with the impact of sulfate in the MFC, select the best MFCreactor and substrate. The results show that, In order to achieve maximum use oforganic energy and sulfate reduction,4cm single chamber air cathode reactor with aceticacid substrate able to get the best results.To achieve the goal treating sulfur-containing wastewater and recovering sulfurelement in conjunction with MFC technique, voltage, power density, coulombicefficiency etc were investigated for MFC systems added with sulfate. The result showedthe power density of the system dropped by9.1%, that’s426mW/m~2. While thecoulombic efficiency increased by9.6%, corresponding to the increase of totalcoulombs by11.4%and the operation period from84to96h. In addition, the efficiencyof sulfate reduction reached to89.4%, which could be convinced by the resultingproduct sulfite in the solution as well as element sulfur on the anode. Therefore, MFCachieved the utilization of sulfate-containing water with sulfate reduction and powergeneration.In order to achieve the sulfur resource recovery of the sulfur-containing wastewaterand optimize the performance of the MFC, sulfide, the reduction products in MFCsulfate reduction, put into a power-assisted electrochemical anodic oxidation system. Achieve sulfide to elemental sulfur oxidation process and Separation from electricityproduction and sulfate reduction, and studied the power-assisted electrochemical currentdensity and electrode materials, and other factors. The results showed that: in thepower-assisted electrochemical system, the sulfur recovery rate of the carbon clothelectrode can reach64.2%, Significantly superior to the titanium plate electrode.In order to complete the MFC electrical energy use and the complete process ofsulfur wastewater treatment, building a microbial electrolysis system with MFC andelectric-assisted electrochemical system. Use the capacitive charge and dischargecharacteristics, as an electricity transfer station. Series three capacitors discharge can getthe best sulfur recovery rate of38.9%, sulfate removal efficiency of89.4%, and CODdegradation rate of76.5%. Design schematics, complete microbial electrolysis systemof continuous operation. The first successful combination of the capacitor charge anddischarge characteristics.In order to achieve the best run and the matching results, the regulatory responsephase of the current density, respectively, the rate of sulfate reduction, sulfide removal,sulfur recovery and operating results coupled analysis. The results showed that: thecurrent density of the MFC best sulfate reduction rate was1.41A/m~2, the sulfurrecovery current density of1.50A/m~2, MFC-electrodeposition coupled current density1.53A/m~2, able to achieve a good match.Enlarge reactor1t containing sulfate wastewater treatment capacity, infrastructureand operating costs, results show that: the infrastructure fee of14,080yuan, the annualoperating costs of43,862yuan.