CN1305976A

CN1305976A - Process for treating sludge generated after sewage treatment

Info

Publication number: CN1305976A
Application number: CN00113224A
Authority: CN
Inventors: 曾智勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-14
Filing date: 2000-01-14
Publication date: 2001-08-01

Abstract

A process for processing the mud generated after treating sewage to obtain fertilizer includes adding ferrous sulfate (0.2 Kg/cu.m), mixing, dewatering, measuring the content of N,P and K in the mud, and adding N,P,K and microbes able to decompose organic substances. Its advantage is eliminating secondary pollution.

Description

Treatment process to the mud that after sewage disposal, obtains

The present invention relates to a kind of sludge treatment method, particularly by the treatment process of the mud that obtains after disposing of sewage.

In numerous sewage disposal technologies, the processing of the mud that it is final is that the mud that obtains after ten minutes pain in the neck, particularly biological treatment are handled is not only many; And water content height.Conventional at present processing is landfill or burning on the spot.But there is following shortcoming in such method.At first sewage normally obtains closing the supernatant liquor of symbol emission standard after treatment, and contains the higher heavy metal ion of concentration in the remaining mud, if direct landfill can cause secondary pollution inevitably; And adopt the method for burning to avoid the problems referred to above, but also appropriate litigation fees height.Someone attempts to make brick with mud as raw material, but mud is different from clay after all, and sintering technology haves much room for improvement.

The purpose of this invention is to provide a kind of sludge treatment method, make it innoxious, and further with its reasonable utilization.

Technical scheme of the present invention is: add the 0.2kg ferrous sulfate by every cubic metre of mud in mud, mix, the mud that will obtain after will concentrating then further dewater to moisture content below 5%, measure nitrogen in the mud of dry back, phosphorus, the content of potassium, and add corresponding nitrogen, phosphorus, potash fertilizer makes wherein nitrogenous 〉=6%, phosphorus 〉=5%, potassium 〉=3%, the microorganism of adding energy decomposing organic matter simultaneously.

The purpose that adds ferrous sulfate is that the heavy metal ion in the mud is reduced.And the microorganism that adds the energy decomposing organic matter is that the organic matter in the mud is digested, and makes the fertilizer that makes with present method can not stink.

For heavy metal ion is fixed, when adding the ferrous sulfate reductive agent, add cationic polyacrylamide flocculant agent 0.1kg by every cubic metre of mud.

Dizzy flowers and plants, greening woods, the scenic forest of being used on of the fertilizer that obtains by the present invention.

Mud after the inventive method is handled has become and can fundamentally eliminate the secondary pollution that primary sludge may bring for the fertilizer that utilizes, and has also utilized the organic matter in the primary sludge simultaneously, and by adding nutriment in a fertilizer balance fertilizer efficiency, has reached the purpose that changes harmful to treasure.Compared with prior art expense is low; And can when making social benefit, plane create economic benefit.

Fig. 1 is the schema of treatment process provided by the invention.

Embodiment

1. in containing the mixing concentration basin 1 of 10 cubic metres of mud, add 2kg ferrous sulfate, 1kg cationic polyacrylamide flocculant agent; And thorough mixing, left standstill then 3-5 hour.

2. be sent to the lower floor's mud after the supernatant liquor discharging per hour that 25 cubic metres pressure-filtering separating machine 2 anhydrates, simultaneously with sewage backflow in the sewage disposal program, and clod is in drying bed 3 seasoninies, control moisture is below 5%.

3. dry clod enters Universalpulverizer 4, forms native powder; Measure nitrogen in the native powder, phosphorus, the content of potassium: nitrogen 1.73%, phosphorus 2.05%, potassium 0.85%.

4. 1 ton in the powder of fetching earth drops in the double spiral agitator 5 of 3000 liters, and adding carbon amine 356kg, single superphosphate fertilizer 468.2kg, Repone K 161kg, efficient phosphate solubilizing bacteria compost 5kg (effective bacterium 2000IU/mg, Meizhou, Guangdong Province biotechnology company limited produces, down together), efficient potassium solubilizing bacteria compost 5kg, the multi-functional short sick vinelandii compost 5kg that presses down.Stirred mixed 1-2 hour.

By analysis, pH value is 6-7 in the resulting fertilizer, nitrogen 5.94%, phosphorus 5.02%, potassium 7.92%.

5. the native powder after qualified is sent to tablets press 6 granulations, makes 2000kg compound particle fertilizer altogether.

Claims

1. to the treatment process of the mud that after sewage disposal, obtains, in mud, add the 0.2kg ferrous sulfate, mix by every cubic metre of mud, the dirt that will obtain after will concentrating then mix further dewater to moisture content below 5%, measure nitrogen in the mud of dry back, phosphorus, the content of potassium, and add corresponding nitrogen, phosphorus, potash fertilizer make wherein nitrogenous 〉=6%, phosphorus 〉=5%, potassium 〉=3%, the microorganism of adding energy decomposing organic matter simultaneously.

2. the treatment process to the mud that obtains after sewage disposal according to claim 1 is characterized in that adding cationic polyacrylamide flocculant agent 0.1kg by every cubic metre of mud when adding the ferrous sulfate reductive agent.