Analysis of the application of Ace cam lobe pump for plate width filter press feeding in printing and dyeing sludge treatment
Brief background of printing and dyeing sludge: printing and dyeing wastewater treatment is difficult and complex, generating many sludge links and a large amount of sludge
The situation of printing and dyeing sludge generation: sludge is generated in pre-treatment, deep treatment, and even biochemical The sludge will be generated in the process of pretreatment, deep treatment and even biochemical treatment. In general, for printing and dyeing companies, the biochemical process uses activated sludge or contact oxidation with long residence time, which generates very little residual sludge, so the sludge generated is mainly from pretreatment and deep treatment processes.
The pre-treatment or deep treatment is mainly by adding PAC or PFS and PAM to adsorb and remove the organic matter from the wastewater, and the sludge from the adsorption is separated from the mud and water by air floatation or sedimentation. The sludge generated by adsorption is separated from water by air flotation or sedimentation. Depending on the product and process differences, the sludge generated from printing and dyeing wastewater is about 8% to 10% of the wastewater volume, with a water content of 97% to 98%. And some process sludge is acidic.
Disposal of printing and dyeing sludge: In order to facilitate transportation and treatment, the sludge needs to be dewatered and then treated.
2) Multi-stage decanter centrifuge: 80-85% water content, high polymer flocculant, high cost and energy consumption
3) Ordinary plate and frame filter press: 80-85% water content
4) Diaphragm plate and frame filter press: 55-60% water content
Comparatively speaking, the plate and frame filter press has a large capacity and simple operation. In particular, the diaphragm plate and frame filter presses introduced in recent years can reduce the water content of sludge to 55%~60%, which greatly reduces the water content and pile volume of sludge, and colleagues reduce the cost of sludge storage, transportation and disposal.
The final feed pressure of diaphragm filter press is about 0.7-0.8Mpa, and the traditional sludge feed pumps are: screw pump, diaphragm pump (pneumatic, electric), reciprocating pump, but there are many problems in the use of several pumps, such as:
1, small flow rate, low efficiency
2, large footprint
3, the rubber stator is a wearing part, the late maintenance costs are high
4, maintenance and repair difficulties
Pneumatic diaphragm pump
1, high energy consumption
2, low pressure
3, many wearing parts, high maintenance costs
4, high failure rate, maintenance and repair difficulties
5, small flow rate, low efficiency<
Electric diaphragm pump
1, difficult to absorb material, easy to lead to cavitation
2, many wearing parts, high maintenance costs
3, high failure rate, maintenance and overhaul difficulties
4, can not handle high viscosity sludge
1, need to configure hydraulic workstation, large footprint
2, relatively high energy consumption
3, high cost investment