Physico-chemical treatment of marble processing wastewater and the recycling of its sludge

Abstract

In the first part of this study, the treatability of marble processing wastewater by the coagulation-flocculation process was investigated. Optimum coagulant-flocculant doses for turbidity removal in wastewater from the cutting, faience and equalization processes were determined as 500, 200 and 500 ppm of Al2(SO4)3; 300, 500 and 300 ppm of FeCl3 and 600, 400 and 200 ppm of Agrofloc 100 (AGRON Water Treatment Technologies and Chemical Marketing Industry and Trade Limited Company, Izmir, Turkey), respectively. It was found that the removal of total solids from cutting and equalization process wastewaters was highest for the 100 ppm dosage of all chemicals used. The amount of total solids removed from faience process wastewater by Agrofloc 100 was higher than that removed by the other chemicals used. The removals of suspended solids from cutting, faience and equalization process wastewaters were similar to each other for each of the chemicals. The pH values after treatment by Agrofloc 100 were higher than the values determined after treatment by other chemicals for all process wastewater. Electrical conductivity values, however, were lower for Agrofloc 100 than for the others. Settled sludge volume experiments showed that settled sludge volumes decreased with time. The results of the quiescent settling experiment showed that the settling type could be termed flocculent settling. In the second part of the study, the usage of waste sludge from marble processing as an additive material in cement was investigated. The waste sludge originated from the wastewaters of different steps of the marble processing plant. Waste sludge was replaced with cement at various percentages by weight to prepare the mixtures of mortar. The specimens poured into the moulds were held for 24 h, removed from the moulds and held again for 28 days in lime-saturated water at 23 degrees C. Compressive and flexural strengths were evaluated with respect to percentages of waste sludge replaced with cement. The maximum compressive and flexural strengths were observed for specimens containing a 6% waste sludge when compared with control and it was also found that waste sludge up to 9% could effectively be used as an additive material in cement.

Effect of Using Stone Cutting Slurry Waste (Al-Khamkha) on the Compaction Characteristics of Jerash Cohesive Soil

“…So these waste material needs to be utilized meaningfully in economic way. However, particular stone cutting slurry waste may have different physical and chemical properties depending on the type of the stone and on the method of generation of waste, in this research stone which used in building as a wall which mostly limestone was used [14] [15]. Table 1 it lustrates the physical & chemical characteristic of slurry samples generated from the stone cutting process for different types of stone [16] [17].…”

Systematic assessment of electrocoagulation for the treatment of marble processing wastewater

“…Coagulation and flocculation is a widely used physicalchemical process in wastewater treatment. Ayoub et al (2000) investigated the coagulation-flocculation of MPW, using seawater liquid bitterns as a coagulant and in another study by Arslan et al (2005) treatment efficiency was investigated using various coagulant chemicals. In small workshops, the general application for reusing of wastewaters is currently proceeded with purifying the wastewater through gravitational settling methods in pools and then including it into the process pipeline by pumping the supernatant (Solak et al 2009).…”

“…These treatment methods are not available for waste of inorganic origin, such as marble processing sludge. The treatment and reuse of these wastes by various methods are important from both environmental and waste management viewpoints (Arslan et al 2005).…”

Fine particle removal from natural stone processing effluent by flocculation

“…In addition, the suspended particles in recycled water may also result in pipe clogging. Arslan et al [9] also reported a research article focusing on the usability of the coagulation-flocculation process for the treatment of marble processing wastewater and the recycling of its sludge in the cement industry. However, at most of them, only marble effluents were concerned.…”

“…It was reported that a 31% anionic polymer shows the best performance on the settling rate of a Bulgarian marble suspension. Arslan et al [9] also reported a research article focusing on the usability of the coagulation-flocculation process for the treatment of marble processing wastewater and the recycling of its sludge in the cement industry. According to treatment test results conducted with both coagulation and flocculation reactive uses, an anionic polyelectrolyte, Agrofloc 100, has been found to obtain the highest treatment performance compared with other reactive such as FeCl 3 and Al 2 (SO 4 ) 3 .…”