Preparation method and application of an inorganic-organic composite sludge conditioner

Abstract

The invention belongs to the technical field of sludge treatment, relates to a preparation method and an application of a sludge dewatering conditioner, in particular to a preparation method and an application of an inorganic-organic compound sludge conditioner, and provides a novel method and a particular preparation method of a chitosan (CTS)-polymerization ferric chloride (PFC) compound conditioner. The novel method is characterized in that sludge is firstly treated by NaCl and then collectively treated by the chitosan (CTS)-polymerization ferric chloride (PFC) compound conditioner and sludge residue coagulant aid. The method is excellent in sludge dewatering effect, deep dewatering is achieved, and technical support is provided for sludge dewatering and subsequent treatment.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to the preparation and application of a sludge dehydration conditioner, in particular to a preparation method and application of an inorganic-organic composite sludge conditioner. Background technique [0002] Municipal sludge is a by-product produced in the process of sewage treatment. With the rapid development of my country's economy and rapid population growth, the amount of domestic sewage treatment in my country has increased year by year, and the amount of residual sludge has also increased rapidly. However, the investment and operating costs of sludge treatment are huge, accounting for 25% to 65% of the investment and operating costs of the entire sewage plant, which has become a heavy burden for urban sewage treatment plants. Sludge dehydration has become a very important link in the process of sludge treatment and disposal. It is of great significance to save subseq...

AI Technical Summary

Problems solved by technology

[0014] (1) Inorganic low-molecular conditioners are cheap and easy to obtain, but the dosage is large, generally reaching 5% to 20% of the dry solid weight of the sludge, which will lead to an increase in the volume of the sludge filter cake

Moreover, iron ions have a color, and iron salts are also highly corrosive, and chloride ions in water will also reduce the flocculation of alum, increasing the dosage of alum, so the use of inorganic low molecular conditioners has become less and less

[0015] (2) Synthetic organic polymer conditioners are expensive, generally difficult to degrade, and have biological toxicity. The most widely used PAM monomer is easy to remain in the sludge, and the dehydration rate is only 75%. ” effect, which is more harmful to the environment

Although chitosan is non-toxic and easy to degrade, it is difficult to reduce the dehydration rate to less than 60% when used alone, failing to achieve the purpose of deep dehydration

[0016] (3) Although the inorganic-organic composite conditioner has a good treatment effect, there are still problems such as refractory degradation and environmental pollution, and the synthesis of the composite conditioner is difficult. The inorganic-natural organic composite flocculant has poor stability due to the complex natural organic components. , it is difficult to carry out large-scale industrial production

[0017] (4) For microbial conditioners, there is a lack of research on mutagenesis breeding and gene control of excellent conditioner-producing bacteria, and there are disadvantages such as complex preparation process, long cycle, high cost and low yield.

Images