Alkaloid atık suyunun membran biyoreaktör ile arıtılmasıyla oluşan atık çamurun aerobik çamur stabilizasyonunda partiküler bileşenlerin modellenmesi

Industrial wastewater includes high amount of sulphate, acetic acid and organic matter due to the process of Alkaloid. Alkaloid wastewater that is used in this study has already been treated in a pilot scaled reactor according to the decharge standarts in legal regulations to execute a sustainable wastewater treatment. The industrial plant, which is studied, has an avarage flow rate of 480 m3/d and a maximum chemical oxygen demand (COD) concentration of 43000 mg/L. COD parameters must be increased to 170 mg/L as proposed in the Turkish Water Aquaculture Regulation (1995). However; because it seems unachievable to reduce the concentration, 1500 mg/L which is indicated in the Turkish Water Control Regulation (2004) was taken into consideration. Thus 99.6 percent of COD removal efficiency becomes obligatory to achieve the discharge limit after the treatment (Keskinler and İnsel, 2014). This thesis study aims to identify the dissolved and inert particulate component concentrations of influent wastewater, which resulted from alkaloid process within the contex of biologic treatability-based concentration. Aerobic stabilization of sludge in the pilot scaled membrane bioreactor, in which the wastewater was treated, was evaluated and the endogeneous decay coefficient was determined as respirometric. With the help of respirometric experiments and modelling kinetic and stoichiometric coefficients that related to biologic system were detected. Furthermore, particular product concentration of the sludge and decay coefficients were detected through modelling by using all of the results. To determine the particulate inert and dissolved substances in the influent wastewater (Orhon et al., 1994) method was used. According to this method 2 reactors, which were continuously aerated and were fed with raw wastewater, soluble wastewater were operated. According to experimental results of initial wastewater characterization, inert COD XI and SI were calculated as 309 mg/L (1.13 % of the CT) and 416 mg /L (1.52 %). Sludge that includes 23000 mg SS/L and 9800 mg/L VSS were used in the process of Aerobic Stabilization. SS, VSS and pH measurements were made timely and daily. The experiment had been carried on until the SS/VSS parameters were stabilized. The VSS/SS ratio of the stabilized sludge was found 0.35 mg VSS/mg SS. External aerobic sludge stabilization of the thickened sludge achived a volatile suspended solids reduction % 38 after 19 days. Application of the method proposed by (Ekama et al., 1986) based on successive measurements of descending OUR levels in the course of sludge stabilization yielded endogenous decay rate (bH) of 0.14/d. AQUASIM simulation program was used in the modelling proccesses. Decay of the particulate substance study was based on (Özdemir et al., 2014). OUR data were simulated using the Activated Sludge Model No:1 (ASM1), which provides a mechanistic description for this process is adopted in this part of the study. Biomass composition assessed by model calibration involves four major fractions, namely heterotrophic active biomass, XH; remaining particulate slowly biodegradable COD, XS; particulate inert COD of influent origin, XI and particulate metabolic products, XP generated in the course of metabolic reactions in the reactor. The modelling experiments indicates a total solids concentration of mg COD/L when expressed in terms of cell COD, corresponding to a VSS value of 2375 mg/L; the corresponding active biomass (XH) level is around 2854 mg COD/L. The model estimated the hydolysis rate constant for XP (KXP) as 0.01 mg COD/mg COD. Finally the effects of sludge retention time (SRT) of the activated sludge process on sludge compositon and aerobic sludge stabilization was searched for. In terms of Özdemir et al., 2014, Activated sludge processes operated at different sludge ages have differenk KXP. Kxp value increased with increasing SRT.