Treatment of high saline textile wastewater by activated sludge microorganisms

Abstract

Textile wastewater is a combination of various chemicals and different types of dyes and has a salty nature. In this study, an SBR (sequencing batch reactor) was used to treat synthetic and real textile wastewaters in a 24 h cycle time. Remazol Brilliant Blue R, a reactive dye, was used as the model dye. Dye concentrations ranged from 125 mg/L to 500 mg/L, and TDS (total dissolved solids) concentrations ranged from 1000 mg/L to 10,000 mg/L in synthetic wastewaters. For the highest dye concentration (500 mg/L) with low TDS, an 80.71% COD removal efficiency was obtained; at a TDS concentration of 5000 mg/L, a 59.44% COD removal efficiency was obtained. When the TDS concentration of wastewater was raised to 10,000 mg/L, COD removal decreased to 14.92% and reductions in MLSS (mixed liquor suspended solids) and MLVSS (mixed liquor volatile suspended solids) concentrations were observed. According to the results, increasing the TDS concentration of wastewater up to 5000 mg/L did not affect COD removal efficiency of the activated sludge microorganisms in the treatment system.

The diversity of active microbial groups in an activated sludge process treating painting process wastewater

“…Meanwhile, the conductivity values were in the range of 51-54 mS/m. In general, those measurements results showed that the values of temperature, pH, DO and conductivity were appropriate for the wastewater treatment using the activated sludge system [13,14,15].…”

“…During the operation, there were some occurrences of aerator malfunction resulted low DO value. The DO needed by aerobic microorganisms ideally should be more than 2 mg/L, in order to ensure good effluent quality and prevent microbial decay [14]. Meanwhile, the conductivity values were in the range of 51-54 mS/m.…”

Coagulation Followed By Ion Exchange to Treat Domestic Sewage

“…The maximum value of max was found to 1.645 × 10 3 m 2 s/kg. Assuming a feed rate of Q 0 = 0.5 m 3 /min for C 0 = 2.92 kg/m 3 , the area of the sedimentation tank can be determined as below [31,32] A = Q 0 C 0 max = 40.0285 m 2 (5) The volumetric flow rate of underflow (Q u ) was evaluated as Q u = Q 0 = 0.5 × × = 0.00162 m 3 /s (6)…”

“…In most of cities, DS is mixed with municipal wastewater (MWW) and treated by the municipal corporation using biological method. The biological treatments including activated sludge process (ASP) [3]- [5], sequential batch reactor (SBR) [6]- [8] and membrane bioreactor (MBR) [9]- [11] have been reported to treat MWW. The effectiveness are found in order ASP < SBR < MBR.…”

Use of rhamnolipid in micellar‐enhanced ultrafiltration for simultaneous removal of Cd+2 and crystal violet from aqueous solution

“…They are generally characterized in terms of biochemical oxygen demand, chemical oxygen demand, total dissolved solids, color, salinity, and pH . According to several studies reported in literature, the concentrations of dyes, total dissolved solids, and NaCl in the typical textile effluent vary from 10–200, 1,500–13,000, and 1,000–10,000 mg/L, respectively . Also, pH of the textile wastewater is found to vary in the range of 6.7–11.2.…”