Enhancement of bioseparation and dewaterability of domestic wastewater sludge by fungal treated dewatered sludge.

A promising biological, sustainable, non-hazardous, safe and environmental friendly management and disposal technique of domestic wastewater sludge is global expectation. Fungal entrapped biosolids as a result of prior fungal treated raw wastewater sludge was recycled to evaluate its performance as inoculum for bioseparation/bioconversion of supplemented sludge in view of continuous as well as scale up wastewater sludge treatment. Encouraging results were achieved in bioseparation of suspended solids and in dewaterability/filterability of treated domestic wastewater sludge. Fungal entrapped biosolids offered 98% removal of total suspended solids (TSS) in supplemented sludge treatment at 6-day without nutrient (wheat flour, WF) supply. Consequently, 99% removal of turbidity and 87% removal of chemical oxygen demand (COD) were achieved in supernatant of treated sludge. The lowest value (1.75 x 10(12)m/kg) of specific resistance to filtration (SRF) was observed at 6-day after treatment, which was equivalent to the 70% decrease of SRF. The all results except SRF were not influenced further in treatments accompanied with WF supplementation. The present treatments offered significant (P<or=0.01) improvement in all results except SRF of treated wastewater sludge compared to the control. Furthermore, the present result is addressing a potential avenue of probable solution for expected management and disposal of domestic wastewater sludge in future.

[1]  J. Manem,et al.  Bioflocculation in activated sludge: an analytic approach , 1993 .

[2]  J. García,et al.  Integrated biological process for olive mill wastewater treatment , 1992 .

[3]  A. E. Greenberg,et al.  Standard methods for the examination of water and wastewater : supplement to the sixteenth edition , 1988 .

[4]  M. Hamdi,et al.  Use of Aspergillus niger to improve filtration of olive mill waste-waters , 2007 .

[5]  A. Fakhru’l-Razi,et al.  Use of fungi to improve bioconversion of activated sludge. , 2005, Water research.

[6]  A. Fakhru’l-Razi,et al.  Biosolids accumulation and biodegradation of domestic wastewater treatment plant sludge by developed liquid state bioconversion process using a batch fermenter. , 2003, Water research.

[7]  M. A. H. Molla.  Solid State Bioconversion of Domestic Wastewater Treatment Plant Sludge into Compost by Screened Filamentous Fungi , 2002 .

[8]  O. Lorain,et al.  Potential of freezing in wastewater treatment: soluble pollutant applications. , 2001, Water research.

[9]  A. Fakhru’l-Razi,et al.  A potential resource for bioconversion of domestic wastewater sludge. , 2002, Bioresource technology.

[10]  A. Yediler,et al.  Biodegradability oriented treatability studies on high strength segregated wastewater of a woolen textile dyeing plant. , 2004, Chemosphere.

[11]  Alice B. Outwater.  Reuse of Sludge and Minor Wastewater Residuals , 1994 .

[12]  John T. Novak,et al.  Effects of potassium ion on sludge settling, dewatering and effluent properties , 1998 .

[13]  A. Fakhru’l-Razi,et al.  TREATMENT OF WASTEWATER SLUDGE BY LIQUID STATE BIOCONVERSION PROCESS , 2001, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[14]  S. Gupta,et al.  Biological treatment of pharmaceutical wastewater , 1988, Water, Air, and Soil Pollution.

[15]  Suraini Abd-Aziz,et al.  DOMESTIC WASTEWATER BIOSOLIDS ACCUMULATION BY LIQUID STATE BIOCONVERSION PROCESS FOR RAPID COMPOSTING , 2002, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[16]  A. Fakhru’l-Razi,et al.  Evaluation of solid-state bioconversion of domestic wastewater sludge as a promising environmental-friendly disposal technique. , 2004, Water research.

[17]  B. Patel,et al.  Screening and selection of microfungi for microbial biomass protein production and water reclamation from starch processing wastewater , 1999 .

[18]  F. Kargı.  Enhanced biological treatment of saline wastewater by using halophilic bacteria , 2002, Biotechnology Letters.

[19]  P. M. Mohan,et al.  BIOREMEDIATION OF TOXIC METAL IONS FROM POLLUTED LAKE WATERS AND INDUSTRIAL EFFLUENTS BY FUNGAL BIOSORBENT , 1995 .

[20]  Nicholas F. Gray,et al.  Biology of Wastewater Treatment , 1990 .

[21]  A. Fakhru’l-Razi,et al.  Enhanced settleability and dewaterability of fungal treated domestic wastewater sludge by liquid state bioconversion process. , 2003, Water research.

[22]  J. C. Liu,et al.  Enhanced sludge dewatering by dual polyelectrolytes conditioning , 2000 .

[23]  Change of particle structure of sewage sludges during mechanical and biological processes with regard to the dewatering result , 1997 .