|
Printing and dyeing wastewater is a large amount of water, complex composition, water quality varied, high color, alkalinity, poor biodegradability, contain certain toxic substances are refractory organic wastewater, industrial wastewater treatment focus. In this thesis, five grid baffled anaerobic reactor (ABR) pilot plant processing the dyeing wastewater discharged by a printing and dyeing enterprises, as well as five grid ABR-based printing and dyeing wastewater wastewater pilot plant test inspected in ABR on printing and dyeing wastewater treatment effect and its degradation characteristics of major pollutants, the following main conclusions: (1) ABR pretreatment of printing and dyeing wastewater start fast, has good feasibility and applicability. Start early, water mixed in proportion to the actual waste water and glucose with a glucose dosage gradually reduced until the water completely for the actual printing and dyeing wastewater. After 50 d, the water color reddish brown water turns pink, B / C rise by the water of 0.21 to 0.36, significantly improved biodegradability, the reactor startup success. (2) ABR printing and dyeing wastewater COD has better treatment effect. When the hydraulic retention time (HRT) of 32h, 24 h, 18 h, 14 h and 10 h, COD removal rate of decreased with HRT shorten. ABR different Geocell the COD removal rate difference, which grid highest COD removal efficiency of 38.5% -54% of the total; With HRT decreases, ABR front-end Geocell the COD relative removal rate was decreased, the back-end grid room opposite. (3) ABR has good printing and dyeing wastewater color removal. When water chroma significant volatility, the reactor has a certain impact resistance. Stable operation period, when the water 380 times the average chrominance effluent average chromaticity of about 150 times the average removal rate of approximately 60%. Color removal with HRT shorten slowly decreased, but more than 50%. Each compartment chroma along gradually reduced, the highest removal rate of the first grid, followed by the second grid. (4) by ABR pretreatment, dyeing wastewater biodegradability been greatly improved. Different HRT water B / C of about 0.2, the effluent B / C $ 0.35, significantly improved biodegradability, facilitate the subsequent aerobic treatment. (5) ABR having a certain temperature impact resistance. HRT of 24 h, 15 ° C when the COD removal efficiency decreased by more than 30 ° C when only 6.6%. (6) HRT = 24 h was investigated ABR-A / O combination treatment of dyeing wastewater run effect. The results show that the aerobic effluent COD removal rate up to 80%; effluent ammonia was 4.05 mg / L to less than 5 mg / L, reached DB32/1072-2007 criteria; color removal rate reached 76%, the end of the treatment discharge standards provides a strong guarantee. (7) by GC-MS shows ABR before and after treatment, printing and dyeing wastewater organic structure and type of the great change; organic matter is degraded by aerobic treatment, a further reduction in species; certain benzenes and phenols can not aerobic removal, limiting the system performance of the play, stable up to DB32 Taihu standards still need depth treatment. (8) ABR Mixed Dyeing Wastewater Treatment Pilot Study. The results show that the ABR in HRT = 24 h under stable operation of 2 months into the effluent COD concentration of 630 mg / L, 376 mg / L, the average removal rate of 40.4%; inlet and outlet water were average chromaticity 380 times, 110 times, the average removal rate of 70%. By ABR, printing and dyeing wastewater B / C increased from 0.28 to 0.41, significantly improve the biodegradability of wastewater.
|