Dry Sludge Research Paper

1. LITERATURE REVIEW

1.1. INTRODUCTION

Many researchers all over the worldwide examine the issue of waste water sludge resulted from WWTPs and introduce many solutions to dispose this sludge in an easy, cheap and safe way without harm the humankind, they examine many ways like utilizing the sludge in (landfill, incineration, and Sustainable Agricultural Use), but these ways had a destructive impacts for the humankind, and the environments too. Hence, the researchers try to discover and create better approaches to overcome these issues; one of these solutions is utilizing the dry sludge with different percentages in many construction materials like (non-reinforced concrete, brick, and glass).

1.2. STUDY OF SEWAGE SLUDGE MANAGEMENT

Sewage sludge

Other, less developed outlets exist, such as

Silviculture, land reclamation, and other developing combustion technologies including wet oxidation, pyrolysis and gasification. Each recycling or disposal route has a specific inputs,

Outputs and impacts. Also it's combined with the outputs of sludge recycling consist of yield improvement, but also of emissions of Pollution into the soil, and indirect emissions into air and water.

Consequently, disposal routes of sewage sludge represent a serious environmental issue in Egypt Newly; there has been an increasing concern about sewage sludge management due to the environmental risks, which resulted from the fast expansion of wastewater treatment plants without equal attention in dealing with the produced sludge.

A. SLUDGE DIFFERENT STAGES

Sludge is a by-product of the waste water treatment different process, which affect the sludge types, as there are three main categories of sludge Figure (2, 4):

• Sludge produced from the treatment of urban wastewater, which consisting of '' domestic waste water or a mixture of domestic waste water with industrial waste water and/or run-off rain

Sludge different types for different waste water treatment process

While in the lagoon wastewater receives treatment through a combination between many treatment stages like'' of physical, biological, and chemical processes''. Much of the treatment, it depends on the natural condition, but some systems are designed to also use aeration devices which needed to increase the amount of oxygen in the wastewater.

The lagooning technique mainly depends on creating a bacterial population in the lagoon, which converts organic matter into CO2 and biomass, and Oxygen is fed into the system via the photosynthetic activity of macrophytes ''unicellular algae'' or macrophytes ''plants'', although an alternative technique consists of artificial aeration of the lagoon. Generally, water is passed through several lagoons each reaching a higher level of

Depollution and This technique are suitable for WWTPs with large site areas.

Coagulation is the addition and rapid mixing of a coagulant to neutralize charges and collapse the colloidal particles so they can settle. The flocculation is the adhesion of the colloidal particles that have been subjected to coagulation