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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chang, Ming Zhou, Shun gui Lu, Na Ni, Jin ren |
| Copyright Year | 2007 |
| Abstract | Sewage sludge is a cost-effective media for the production of Bacillus thuringiensis (Bt) based biopesticides. To enhance the entomotoxicity of the fermentation broth, pretreatments of sewage sludge by alkali and ultrasonic were applied in this study. Effects of alkaline and ultrasonic pretreatments on the soluble COD (SCOD) and total COD (TCOD) were evaluated by altering the alkali addition dose and the ultrasonic specific energy. Suitable pretreatment conditions were optimized with 5 g l$^{−1}$ sodium hydroxide (NaOH) for alkaline treatment and 1.2 × 10$^{5}$ kJ kg$^{−1}$ of total solid for ultrasonic treatment. Fermentations of raw and pretreated sludge for biopesticides were carried out in a bench scale fermentor. Results revealed that both pretreatments were effective for Bt growth and metabolism. Higher viable cells (VC) and viable spores (VS) counts, δ-endotoxin yields and entomotoxicity were achieved in the pretreated sludge. The enhancement was attributed to more available nutrients and better oxygen transfer. Moreover, ultrasonic pretreated sludge was superior to alkaline pretreated sludge for δ-endotoxin production and entomotoxicity owing to its higher soluble C/N ratio and finer particles. |
| Starting Page | 75 |
| Ending Page | 84 |
| Page Count | 10 |
| File Format | |
| ISSN | 00496979 |
| Journal | Water, Air, and Soil Pollution |
| Volume Number | 186 |
| Issue Number | 1-4 |
| e-ISSN | 15732932 |
| Language | English |
| Publisher | Springer Netherlands |
| Publisher Date | 2007-08-03 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Waste reuse Sewage sludge Alkaline pretreatment Ultrasonic pretreatment Bacillus thuringiensis subsp. kurstaki Biopesticide Hydrogeology Terrestrial Pollution Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Atmospheric Protection/Air Quality Control/Air Pollution Environment |
| Content Type | Text |
| Resource Type | Article |
| Subject | Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology |
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