Concrete brick is a type of brick-shaped building element made from Portland cement, water and aggregate. Along with the times, need for concrete bricks increasingly varied, such as lightweight bricks. To produce in mix, substitution materials can be used developers or that have light specific gravity. One Silica. Geothermal Sludge has pozzolanic properties because it contains silica minerals, ...

background and purpose: disposing sludge from industrial wastewater treatment plants (iwwtps) is a serious issue because it can affect human and animals health, and also environmental quality. in this study, sludge from an iwwtp was analyzed regarding its physicochemical characteristics and disposal options. materials and methods: grab sampling was used to collect 12 sludge samples biweekly (ma...

Activated sludges are an inoculum source commonly used in biodegradation studies, as wastewater treatment facilities constitute an entry point to the environment for many chemicals. In this paper, the main issues relating to the use of activated sludge in biodegradability tests are presented. Special attention is also devoted to discussing the factors affecting both the activity of the microbia...

The present disposal routes of sewage sludge represent a critical environmental issue in Egypt. Recently, 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. This paper discusses the current situation of sewage sludge ...

This paper presents three new approaches to reduce excess sludge production in activated sludge systems: 1) modification of conventional activated sludge process with insertion of a sludge holding tank in the sludge return line; 2) chlorination of excess sludge so as to minimize excess sludge production; and 3) utilization of a metabolic uncoupler, 3, 3', 4', 5-Tetrachlorosalicylanilide (TCS) t...

An integral part of this project was to conduct an investigation of the full scale septic system that has been operating continuously at Modern Landfill since 2000. The design of this system was described in detail in Spagnoli et al., (2001) This system provides an ideal test bed to evaluate the long-term acceptability of tire derived aggregate (TDA) as an alternative to stone as the system’s a...