Available as an ebook
Please purchase via www.iwaponline.comOpens in new window
Also part of Water Intelligence Online Digital Reference Library
Standard ePrice: £29.00
+ VAT
Anaerobic/aerobic (AnA) and completely aerobic (CA) laboratory-scale sequencing batch reactors operating on an acetate- and casamino acids-based synthetic wastewater were used to investigate the suitability of the AnA process for treating nutrientﾖdeficient wastewaters in plants that have stringent effluent nutrient requirements. Of particular interest is the case where phosphorus (P)-deficient wastewaters with highly variable influent COD loading are being treated to meet both effluent TSS and P limits. At a 4 d mean cell residence time, AnA activated sludge had an approx. 20% lower P requirement than CA activated sludge. The difference between the end-of-aerobic cycle polyhydroxyalkanoate and carbohydrate contents of the sludges indicated that the AnAsludge used more influent carbon than the CA sludge for synthesis of non-P-containing storage products. The nitrogen requirements of AnA sludge were similar to those of the CA sludge. The AnA and CA SBRs were subjected to three different transient influent COD loading patterns that simulated (#1) daily COD Loading fluctuations, (#2) low weekend COD loading, and (#3) extended low COD loading periods. During the Loading Pattern #1 experiment, the average effluent soluble P concentrations for the AnA and CA SBRs were 0.4 and 1.0 mgP/L respectively, and complete removal of influent acetate was observed. During the Loading Pattern #2 experiment, the average effluent soluble P concentrations for the AnA and CA SBRs were 0.3 and 0.9 mgP/L respectively, but effluent acetate was detected during the first high COD loading cycle following the low weekend COD loading period. During the Loading Pattern #3 experiment, the VSS content of both reactors dropped sharply, effluent acetate breakthrough occurred, and effluent P concentrations exceeding 1 mgP/L were detected in both the AnA and CA SBRs. Based on these findings, the AnA process has potential as a technologically and economically superior alternative for wastewater treatment plants treating P-deficient wastewasters to meet stringent effluent TSS and P limits.
This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below
Manual on the Causes and Control of Activated Sludge Bulking, Foaming and other Solids Separation Problems
The most common activated sludge operating problems causing poor plant performance are related to solids separation. Especially common are bulking and foaming. Without a proper scientific...
Fate and Persistence of Pathogens Subjected to Disinfection
Disinfection of wastewater is a necessary treatment process for protecting the public from potential exposure to pathogenic microorganisms. Two common forms of disinfection are chlorine and...
Understanding Factors Affecting Polymer Demand for Thickening and Dewatering
Polymer demand varies considerably for different digestion processes as well as the same digestion processes at different locations and the reasons for these differences are not known. The...
Factors for Success in Developing Use Attainability Analysis
A Use Attainability Analysis (UAA) is a process to review and potentially modify a waterbody’s designated uses, as embodied in the state water quality standards. A UAA...
Feasibility, Design Criteria, and O&M Requirements for Small Scale Constructed Wetland Wastewater Treatment Systems
The expanding use of decentralized wastewater management has resulted in an increased interest in small-scale wetland treatment systems. However, there is limited information available on the use...
Stormwater Non-Potable Beneficial Uses and Effects on Urban Infrastructure
This project shows that lessons learned and successes from a wide variety of international stormwater beneficial use projects cover a range of conditions that may be found in the U.S. Examined are...
Urban Drainage
Urban Drainage: A Multilingual Glossary has been written by research engineers and scientists with substantial experience in the urban drainage field. It provides definitive...
Emergency Response and Recovery Planning for Water Systems
Government agencies and water utilities have mechanisms in place for managing a range of emergencies and disasters such as earthquakes, hurricanes, disease epidemics, and...
Enhancing Biodegradability of Refractory Aromatics in Wastewater
Chlorinated aromatics, nitroaromatics, and azoaromatics are widely used in industry. As a result, these compounds are commonly present in industrial wastewater. Aerobic biological treatment...