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Sludge is the product of sewage treatment. The main characteristics of sludge are high water content (up to 99% or more), high organic content, easy to decompose and smell, which requires sludge drying treatment. The current sludge treatment process Among them, the drying method of sludge treatment still ranks first. Today, the editor summarized some technical solutions for sludge drying for your reference.
1. What does the product temperature mean in the drying process?
Sludge is a kind of ultra-fine powder with high organic content. The purpose of sludge drying is first to reduce and sanitize. Regardless of the final disposal method, sludge drying itself does not change the properties of the sludge, that is, temperature does not cause degradation of the sludge product or quality problems. In view of this, whether from the perspective of the quality of the sludge product or the efficiency of the dryer, the higher the temperature, the better. However, due to safety issues, most drying processes tend to reduce the temperature of the product as much as possible, that is, reduce the ignition energy of the so-called dust explosion.

Part One: Treatment method and technology
　　1. Impurities in water can be divided into three types: inorganic, organic and microbes, as well as suspended matter, colloid and dissolved matter.
　　2. Purpose: To remove or reduce suspended substances, colloids, harmful bacterial organisms and other harmful impurities in the raw water.
　　3. Commonly used water treatment methods are:
　　(1) Natural precipitation: used to remove coarse particles in water;
　　(2) Coagulation and sedimentation: use coagulation agents to sediment or clarify to remove colloids and suspended impurities in water;
　　(3) Filtration: make the water pass through the fine-porous filter material layer to intercept and remove the remaining fine impurities after precipitation or clarificatio; or without precipitation, the raw water is directly dosed, coagulated, and filtered to remove colloidal and suspended impurities in the water;

The heavy metals in wastewater cannot be decomposed and destroyed by various common methods, but can only transfer their location and change their physical and chemical forms. After treatment of heavy metal wastewater, two products are formed, one is the treated water from which heavy metals are basically removed, and the other is the concentrated product of heavy metals.
Approach:
Heavy metal wastewater treatment methods can be divided into two categories: one is to convert heavy metals in a dissolved state into insoluble heavy metal compounds or elements, which are removed from the wastewater by precipitation and floating. The neutralization precipitation method, the sulfide precipitation method, and the Floating separation method, ion flotation method, electrolytic precipitation or electrolytic floating method, diaphragm electrolysis method, etc.; the second is to concentrate and separate heavy metals in wastewater without changing their chemical form. Reverse osmosis and electrodialysis can be used Method, evaporation method, ion exchange method, etc. The processing principle is as follows:

This is a virtual tour of water resources recycling facilities in the United States, detailing how wastewater treatment facilities recycle water and waste that we rush into the sewer. Water recycling facilities can also recover nutrients, generate energy, and create biosolids that are used as fertilizers.

Resource recovery is the talk of the wastewater industry, but maybe your facility is not so progressive just yet. While drawing energy from sludge or recycling it into fertilizer may be the wave of the future, what about the simpler goal of improving on good old-fashioned dewatering?

Sludge dewatering separates sludge into liquid and solid components for waste minimization. There are various technologies for sludge dewatering, including plate & frame and belt filter presses, centrifuging, and geomembranes. In addition to these, there are other options available.

A Swedish full-scale pilot plant employing all-year-round natural sewage sludge dewatering is presented in this paper. The treatment includes three different types of outdoor ditches: a freezing ditch for the winter months, a drying ditch for the early summer months, and a combined drying-freezing-thawing-drying (DFTD) ditch for sludge produced in late summer and early autumn. 

The invention discloses a microalgae harvesting and dewatering method and device. The method comprises the following steps: microalgae liquid is harvested and dewatered by adopting more than one inclined type rotary-drum filter in series connection; the microalgae liquid to be dewatered is conveyed to the high ends of the inclined type rotary-drum filters to enter rotary drums; according to the free falling body principle and the centrifugal principle, microalgae mud in the microalgae liquid is retained on filtering nets, and finally is discharged by the low ends of the rotary drums;