Treatment Of Anaerobically Digested Pig Slurry With The Use Of UF-NF Membrane Processes

Swine wastewater is a high concentration organic wastewater, without effective recycling ortreatment that is directly discharged, will produce serious environmental pollution. On the other hand,swine wastewater can be used as organic fertilizer raw materials, pig wastewater can be regenerated as ahigh-quality fertilizer.This paper slurry Lin’an City Town Board conducted a national ecological demonstration samplingand analysis, choosing the right technology and to swine wastewater pretreatment pretreatment processconditions investigated, the treatment effect. Ultrafiltration-the coupling of the nanofiltration permeatewas concentrated pretreated investigated under different conditions of concentration of the permeatedliquid, concentrated liquid nature, on the basis of the wastewater treatment process to select theappropriate conditions, the following results:1） By analyzing the composition of swine wastewater, including COD, ammonia nitrogen, totalphosphorus, are higher than the equivalent in the relevant emission standards, subject to post-treatmentbefore being discharged. In addition, swine wastewater nutrient-rich ingredients, contains trace elementsnecessary for the growth of plants and animals, amino acids, endogenous hormones. Meanwhile, theharmful low levels of heavy metals in the national emission standard value.2）A working conditions at a temperature of25℃and operating pressure of1.0MP, the use of theentire cycle of operation of trapped liquid waste plus ultrafiltration membrane was carried out through acombination of filtration membrane coupling associated with the technology,20times after processingliquid concentrate can be used as an excellent organic fertilizer irrigation materials. In addition, aftertreatment with liquid water reaches the irrigation water quality discharge standards, can achievedischarge standards.3）With herds of10,000intensive pig farm water washing process, for example, from the aspects ofenergy efficiency, economic and environmental benefits, such as multi-stage filtration membranecoupling process efficiency for a detailed evaluation and analysis the technology in economic benefitsof up to403,700yuan. Embodies the treatment process using membrane technology coupled sewagetreatment advantage.