Bathing Wastewater Reuse Process And Equipment Research

According to the characteristics of bathing wastewater, treating technology is determined.Bathing wastewater is treated by the processes of coagulation-flocculation, filtration, ozone oxidation , active carbon adsorption in turn, and the effluent would be reused as bathing water again. Basing on experiment data, the preliminary design of equipment for bathing waster treatment is made.By experimental comparison, polymerization aluminum chloride( PAC )is choosed to treat bathing wastewater. The dosage of PAC, time of sedimentation, hydraulic condition, pH and temperature of wastewater are investigated. The experiment results show that the removal rate of COD is higher than 80% with the PAC addition of 50g/m. Then bathing wastewater is passing through a two-layer filter which are composed by anthracite and quartzite sand, the filtering capacity of filter for bathing wastewater treatment reach 157t /m3 when the filtering rate is 9.72m/h. the filter can be reused after converse washing. After filtration bathing wastewater is treated by zone oxidation in succession. The conclusion can be draw from experimental results that the organic pollutants in bathing wastewater are oxidated directly by zone and indirectly by hydroxy radical from zone dissolved in water. When the dosage of zone is 3.1mg/L, the COD of effluent contain is lower than 15 mg/L, the concentration of linear alkyl benzene sulfonate (LAS ) is lower than 0.15 mg/L and bacteria is undetected. After the final part of treatment by active carbon adsorption, effluent quality reaches the reusing standards.On the base of technoloyical design, the investment of the treatmant equipment is 340yuan/m3 wastewater and the running cost is 1.43 yuan/m3 wastewater.