Combined and individual applications of ozonation and microwave treatment for waste activated sludge solubilization and nutrient release.

08:00 EDT 12th April 2019 | BioPortfolio

Summary of "Combined and individual applications of ozonation and microwave treatment for waste activated sludge solubilization and nutrient release."

This study focused on the separate and combined applications of ozonation and microwave treatment to enhance the phosphorus and ammonia release from waste activated sludge. Twenty-six batch experiments were run with or without acidic (pH 2) and alkaline (pH 10) pretreatments and different ozone dosages. Also, microwave post-treatments were applied to enhance phosphorus release efficiency. Results showed that ozonation is an effective technology for solubilization and release without any pre or post-treatment, reactive phosphorus content increased from 1.9 to 3.6 mg PO-P/g MLSS (89.5% increase) with 19.4% COD release. Alkaline pretreatment enhanced sludge solubilization and phosphorus release at most (23.9% COD release and 152.6% PO-P increase); however, decreases in ammonia, calcium and magnesium concentrations pointed out a loss of a part of released phosphorus, due to struvite or apatite precipitation. Acidic pretreatment reduced the sludge solubilization during ozonation (10% COD release) but prevented the uncontrolled precipitation and enhanced the phosphorus release (115.8% PO-P increase). For microwave treatment, acid pretreated sludge showed higher release than alkaline pretreated or neutral sludge. Among different process combinations, acid pretreatment/ozonation/microwave experiments have shown the highest sludge solubilization and nutrient release (48% COD release and 579% PO-P increase); however, the difference between acid pretreatment/microwave and acid pretreatment/ozonation/microwave was not significant in terms of phosphorus release (479% PO-P increase, p = 0.082). Thus, pH 2/microwave may be a cost-effective and feasible alternative for nutrient recovery from waste sludge. For struvite precipitation, pH 8.5 were determined as optimum level. Also using fine struvite particles as seed increased struvite precipitation efficiency.


Journal Details

This article was published in the following journal.

Name: Journal of environmental management
ISSN: 1095-8630
Pages: 76-83


DeepDyve research library

PubMed Articles [29848 Associated PubMed Articles listed on BioPortfolio]

Microwave field: High temperature dielectric properties and heating characteristics of waste hydrodesulfurization catalysts.

The exploration of the dielectric properties of waste hydrodesulfurization catalysts has important guiding significance for the development of microwave heat treatment of waste hydrodesulfurization ca...

Examination of gas and solid products during the preparation of activated carbon using phosphoric acid.

Activating agents play significant roles in the preparation of activated carbon (AC) from biomasses and their wastes, which are widely used in AC production. Application methods are also important for...

Comparison of long-term ceramic membrane bioreactors without and with in-situ ozonation in wastewater treatment: Membrane fouling, effluent quality and microbial community.

The comparison of long-term ceramic membrane bioreactors (MBRs) without and with in-situ ozonation was investigated in this study in terms of membrane fouling, activated sludge, effluent quality and m...

Evaluation of enhanced ozone-biologically active filtration treatment for the removal of 1,4-dioxane and disinfection byproduct precursors from wastewater effluent.

Ozonation followed by biologically active filtration (BAF) (O3-BAF) treatment has become an alternative to reverse osmosis in potable wastewater reuse applications due to the ability to produce a high...

Microwave steam activation, an innovative pyrolysis approach to convert waste palm shell into highly microporous activated carbon.

Microwave-steam activation (MSA), an innovative pyrolysis approach combining the use of microwave heating and steam activation, was investigated for its potential production of high grade activated ca...

Clinical Trials [5292 Associated Clinical Trials listed on BioPortfolio]

Microwave Therapy for Treatment of Precancerous Actinic Keratoses

This is a two-stage feasibility study to determine if focussed microwave energy is a suitable treatment for Actinic Keratoses (AK). The two study stages are as follows: Stage 1: ...

Microwave Ablation in Ground Glass Nodules

GGO was commonly observed recently.Radiofrequency ablation has been widely applied in the treatment of patients with GGO. No study had explored the microwave ablation in the treatment of G...

TACE Combined With RFA/MV Treatment in Hepatocellular Carcinoma Beyond Milan Criterial

This study was designed to evaluate the effectiveness of radiofrequency /microwave ablation in patients with hepatocellular carcinoma beyond Milan Criteria.

Evaluating Household Food Behavior With a Smartphone App

The purpose of this study is to test the use of a smartphone app as a way to measure food waste. Investigators propose to improve the accuracy and convenience of household food waste ...

Prospective Clinical Study of the Guidant Microwave Ablation System for the Treatment of PAF in the MIS Procedure

The purpose of this prospective, single-arm, un-blinded, multi-site clinical study is to assess the safety and efficacy of the Microwave Ablation System for the treatment of symptomatic pa...

Medical and Biotech [MESH] Definitions

Waste products which, upon release into the atmosphere, water or soil, cause health risks to humans or animals through skin contact, inhalation or ingestion. Hazardous waste sites which contain hazardous waste substances go here.

A process of waste disposal involving the conversion of green waste (i.e. leaves, organic matter, food waste, manure) into soil-enhancing matter.

Sites that receive and store WASTE PRODUCTS. Some facilities also sort, process, and recycle specific waste products.

Documents describing a medical treatment or research project, including proposed procedures, risks, and alternatives, that are to be signed by an individual, or the individual's proxy, to indicate his/her understanding of the document and a willingness to undergo the treatment or to participate in the research.

Management, removal, and elimination of biologic, infectious, pathologic, and dental waste. The concept includes blood, mucus, tissue removed at surgery or autopsy, soiled surgical dressings, and other materials requiring special control and handling. Disposal may take place where the waste is generated or elsewhere.

Quick Search


DeepDyve research library

Relevant Topic

Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...

Searches Linking to this Article