Wastewater treatment and reuse for aquaculture

Abstract

A continuous laboratory scale model, simulating an oxidation pond system has been used to investigate the treatability of municipal wastewater and to evaluate the treated effluent for aquaculture. While the detention period was kept constant at 25 days, the organic loading rate fed to the system changed with changes in the BOD5 of the raw sewage and varied from 15.7 to 58.3 with an average value of 34.1 kg BOD5/ha/day. Monitoring of the system indicated remarkable improvement in the water quality of the treated effluent. BOD5 was around 26 mg O2/l. Average residual values of COD, suspended solids and phosphorus were 154, 65 and 3.2 mg/l respectively. A reduction up to 99.99% in coliform bacteria population has been recorded. However, residual values were still high. Tilapia fish grew healthily during the study period. Daily growth rate was 1.43% of the body mass. The productivity was 7.15 kg/ha/day. The corresponding extrapolated yield was 26.09 t/ha/yr which is considered to be a high yield as compared to published information.

Improvement of Aquaculture Wastewater using Chitosan of Different Degrees Of Deacetylation

“…However, the curve of NH 3 under similar conditions was better than that by adsorbent polymer hydrogels (90%) [4], but much higher than the results by sequencing batch reactor (75%) and oxidation pond (29%) [3,28]. Since the pKa of chitosan is~6 and pKa 1 of phosphoric acid is~2, chitosan will carry a large positive charge below pH 6, and negatively charged phosphate will be formed above pH 2.…”

Estimating Relative Benefits of Differing Strategies for Management of Wastewater in Lower Egypt Using Quantitative Microbial Risk Analysis

“…Information on the quality of wastewater and the incidence of our key indicator pathogens is drawn from the field testing carried out as part of this project and cross checked with data from earlier field studies ( (Stott, Jenkins, Shabana, & May, 1997), (El Gohary, El-Hawarry, Badr, & Rashed, 1996) (Sherief, El-S Easa, El-Samra, & Mancy, 1996). A summary of the data used for the model is shown in Table 4.…”

Production of Biofuels (H2&CH4) from Food Leftovers via Dual-Stage Anaerobic Digestion: Enhancement of Bioenergy Production and Determination of Metabolic Fingerprinting of Microbial Communities

“…According to Ministry of State of Environmental Affairs (MSEA) reports, the production of wastewater [1], especially industrial wastewater [2] and solid wastes (SW) in Egypt becomes a big problem and should be solved. SW in Egypt was around 22 million tons in year 2015.…”