Dalam beberapa tahun terakhir, pencemaran lingkungan telah mencapai puncak kecil, dan persyaratan nasional untuk standar perlindungan lingkungan menjadi semakin ketat. Polusi kimia telah menjadi sumber polusi air industri yang paling serius di Cina. Sungai di dekat banyak pabrik kimia tercemar parah, tampak seperti sungai mati, disertai bau menyengat. Dalam proses produksinya, pabrik kimia akan membawa beberapa pengotor yang tersuspensi, yang akan menjadi lumpur setelah waktu presipitasi tertentu. Lumpur yang tercemar limbah kimia, serta sejumlah besar bakteri, berbagai logam berat yang berlebihan, parasit dan banyak zat berbahaya yang sulit terurai, secara tidak langsung akan mempengaruhi kesehatan kita.
Most of the early sludge treatment methods in China are incineration, composting, landfill, etc. However, due to the particularity of chemical sludge, the above methods are not suitable. Chemical sludge has small particles and high moisture content, so it is not easy to treat. Therefore, as a dehydration equipment more suitable for chemical sludge treatment, the screw type sludge dehydrator (hereinafter referred to as the "screw type sludge dehydrator") came into being. After dewatered by Dawei Environmental Protection screw type sludge dehydrator, the water content of the sludge can be reduced to below 75%, which can greatly reduce the sludge volume and transportation costs.
There are two main steps for the dehydration of chemical sludge by the screw stacker: dosing flocculation and mechanical main body dehydration.
-
Flocculation
Dosing flocculation makes use of the characteristics of sludge with negative ions. By adding flocculants, positive and negative charges will react in the muddy water, forming large flocs like alum, so that the sludge particles in the muddy water can be rapidly destabilized, which is the best way to accelerate the settling speed. By using the adsorption bridging function, the colloid in the sewage is fundamentally reduced to about half of the original. On the one hand, it can improve the settling speed, while on the other hand, it is a key factor to affect the subsequent sludge treatment effect that the PH value in the sludge can be adjusted to an interval suitable for sludge dewatering. Dawei Environmental Friendly Tip: The staff needs to carefully observe the sedimentation and agglomeration effect before the sludge enters the main body for dehydration.
-
Main body dehydration
The concentrated mud continues to move forward with the rotation of the spiral shaft of the screw stacker body. Along the outlet direction of the mud cake, the screw pitch of the spiral axis is smaller and smaller, the space between the rings is smaller and smaller, and the volume of the spiral cavity is shrinking. Under the action of the back pressure plate at the outlet, the internal pressure gradually becomes stronger, the propulsion shaft moves in turn, the water in the mud is squeezed out, the solid content of the filter cake continues to increase, and finally the mud is continuously dehydrated. The dewatering technology of the main part of the screw stacker can make the sludge fully concentrated and optimize the sludge dewatering performance, so it is widely used in chemical plants.
Although this is a good method for sludge dewatering effect, in view of the huge cost of purchasing a large number of equipment and requiring a large number of operators, this method cannot completely replace the traditional sewage treatment technology, but automatic sludge dewatering treatment is bound to become the future direction of chemical wastewater treatment.
Dalam proses pengolahan lumpur kimia, biasanya terdapat beberapa zat refraktori dan residu mikroba. Kandungan air dapat dikurangi melalui dehidrasi penumpuk sekrup, sehingga dapat mengurangi lumpur, mengurangi biaya pembuangan akhir dan kesulitan lumpur. Dengan penguatan perlindungan lingkungan yang berkelanjutan, persyaratan untuk pengolahan lumpur kimia menjadi semakin tinggi. Pengeringan alami tidak dapat menjamin efisiensi pengolahan dan kualitas lumpur kimia. Oleh karena itu, dehidrator lumpur tipe sekrup, yang dapat menghemat energi dan listrik, mudah dirawat, dan dapat beroperasi secara otomatis tanpa manusia untuk waktu yang lama, sangat cocok untuk limbah dan lumpur di industri kimia.
Bahasa
