Application of Organic Flocculants for the Treatment of Sludge From Municipal Wastewater Treatment Plants

Abstract

After any treatment process of wastewater results residual sludge that is characterized depending on the type of the wastewater or by the sludge treatment type. The sludge treatment process can be divided in three important stages: the preliminary stage (with the sludge thickening), the stabilization stage, and the dewatering stage. The paper shows the results of the research for the identification of the most efficient organic cationic flocculants, which might be used within the process of thickening or dewatering of the sludge, resulting from the municipal wastewater treatment. Considering this, the study aimed to identify the most efficient flocculants, from Zetag category, used for municipal sludge treatment in the thickening and dewatering process. The main parameters studied during the laboratory tests were: size of the flocs, the filtrate and the sludge cake consistency. Also, the experimental results had industrial applications with a real testing of the studied flocculants in a municipal wastewater treatment plant.

Applications of Polymeric Membranes Ultrafiltration Process on the Retention of Bentonite Suspension

“…Transmembrane pressure was calculated with relation [31]: PTM = [(P i +P c )/2]-P p , (1) where: PTM represents transmembrane pressure, expressed in bars; Pi -Pressure from fluid inlet to membrane module [bar]; Pc -Pressure of the concentrate [bar]; Pp -Permeate pressure or filtered water pressure [bar]. The transmembrane pressure recorded throughout the ultrafiltration process was 0.8 bar.…”

“…The environment water factor is still being discussed as the problem of environmental pollution is increasingly concentrated on deteriorating the quality of water sources. Wastewater filtration can be a quite convenient solution for removing pollutants present in wastewater from different industries as well as using coagulant and flocculants solutions to improve the quality of the filtered water [1][2][3].…”

Laboratory Applications in Wastewater Treatment by Using Flocculation Process

“…The flocculation processes applied in wastewater treatment to separate the destabilized colloid particles (or the particles formed during the coagulation phase) by forming flocs [1][2][3][4][5][6][7][8].…”

“…In wastewater treatment processes the flocculation process is applied only when the particles have been destabilized. In many wastewater or sludge treatment processes are used synthetic organic flocculants due to its advantages creates respectively waters with low solids suspension concentrations and weak solutions [1][2][3][4][5][6][7][8][9][10].…”

Hydrodynamic Surface Evaluation of a Polymeric Reverse Osmosis Membrane Using a Crossflow Cell

“…Wastewater treatment and purification is a set of measures and processes by which the mineral, organic and bacteriological impurities contained in the waste water are eliminated or reduced to certain limits, such that these waters do not affect the qualitative characteristics of the receptor in which they are evacuated. For treatment and wastewater treatment several processes based on physical, chemical and biological processes are used [1][2][3][4][5][6][7].…”