Printing and dyeing mud treatment, printing and dyeing sludge dehydration treatment, chemical sludge dehydration treatment-Guangdong Meibang Environmental Protection

2019-04-16

Dyeing sludge dewatering machine in operation in Indonesia

Model: DYQ1000WP1

The following are photos of on-site debugging: Meibang's exclusive on-site photos, any similarity is counterfeit 印染污泥脱水机

photo of Mr. Lu and Michael on the container truck before the shipment

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Printing and dyeing wastewater is characterized by large volume, high levels of organic pollutants, dark color, high alkalinity, and significant variability in water quality. Therefore, it is generally pretreated within the factory before entering the municipal sewage treatment plant. In dyeing wastewater treatment, flotation is commonly used to remove suspended particles. The principle is that particles in the water are lifted, entrained, and adsorbed by microbubbles, lifting them to the surface. To improve the removal rate of pollutant particles in the wastewater, ferrous sulfate, polyacrylamide, and other agents are typically added to increase the particle diameter and the specific gravity difference with water. The resulting sludge has a high moisture content of approximately 94-97%. The sludge is fluffy and absorbs air bubbles and water, expanding its volume. The sludge is high in organic matter and viscosity, making it difficult to flocculate. Conventional dyeing sludge dewatering equipment, such as filter presses, cannot directly dewater it. A concentration tank must be constructed for concentration before treatment. Due to the high viscosity of dyeing flotation sludge, the filter bags of conventional filter presses can become clogged, resulting in no sludge discharge or a high moisture content in the discharged sludge, making dewatering difficult. This is detrimental to production. This belt filter press utilizes the principle of mud-water separation, effectively resolving the problem of conventional filter presses failing to discharge mud, clogging, and high water content in the discharged mud. This machine boasts a high degree of automation, automatic unloading, and communication with the host computer via a PLC, enabling unattended operation and high efficiency, with 24-hour continuous feeding. It achieves excellent dehydration results, resulting in a low mud moisture content 2 to 3 percentage points lower than conventional dehydration equipment.

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3. Working Principle of the Printing and Dyeing Sludge Dewatering Machine:

Sludge is pumped into a dynamic (or static) mixer, where it is mixed with a 0.05-0.1% anionic (cationic) flocculant solution. After sufficient reaction, the tiny solid particles (or suspended matter) in the sludge (or mud) slurry agglomerate into larger flocculent clumps. The bound water and surface water between the materials are separated into free water. The material is then conveyed and spread onto the extended gravity pre-dewatering zone (or belt thickener) filter screen. Under the action of gravity, the free water seeps through the back of the filter screen and separates, forming a stagnant sludge. The sludge reaches the maximum pressure in the squeezing dewatering zone. As the mesh belt moves, it is clamped between the upper and lower mesh belts. It passes through the filter belt with adjustable tension, the rotating rollers of gradually decreasing diameter, and the counter-pressing rollers, where a continuously increasing and slowly increasing counter-roller pressure and shearing force are applied. Under the action of force, the water in the slag (mud) slurry is squeezed out by step-by-step pressure increase through the wedge-shaped area, low-pressure area, medium-pressure area, high-pressure area and strong roller squeeze area. Finally, the filter cake with low water content is formed and discharged. It is scraped away by the scraper plate, and the upper and lower filter belts are separated. The trace particles in the pores on the filter surface are removed by high-pressure flushing water and roller brushes, and then continue to enter the next dehydration cycle.

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Working principle diagram of printing and dyeing sludge dewatering machine: 带式压滤机工作原理

① Sludge Flocculation

To improve sludge dewatering properties, improve filter cake properties, and increase water permeability, sludge requires physical and chemical treatment. This machine utilizes an advanced, new dual-process flocculation device to achieve optimal flocculation results. This method not only produces large, tightly bound flocculated agglomerates, but also significantly reduces reagent consumption, lowers operating costs, and offers significant economic benefits.

② Gravity Concentration and Dewatering Zone

Sludge is evenly fed into the filter screen through a distribution hopper. As the filter belt moves forward, free water, under its own weight, flows through a sufficiently long gravity free dewatering zone into the receiving trough. This gravity dewatering section, also known as the highly concentrated section, primarily removes most of the free and interstitial water in the sludge, reducing its fluidity and facilitating its thicker accumulation on the filter screen, thereby enhancing its ability to withstand pressure. ③ Low/Medium-Pressure Dewatering Zone

After gravity dewatering, the sludge loses its fluidity almost completely. As the filter belt moves forward, the sludge is carried from the wedge-shaped zone onto the porous rollers. The gap between the upper and lower filter belts gradually decreases, causing the material to experience slight pressure, and the filtrate begins to overflow from both sides of the filter belt. As the filter belt moves, the pressure gradually increases, which also gradually enhances the extrusion stability of the flocs.

④ High-Pressure Dewatering Zone with Nip Rollers (or Belts)

After leaving the medium-pressure zone, the sludge enters the high-pressure zone. Here, it is squeezed by one to three sets of nip rollers (or belts). The strong compression significantly reduces the sludge's volume, fully squeezing out the interstitial free water within the sludge, forming a filter cake with a high solids content.

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