Apparatus and process for treating breeding wastewater in pig farm and producing algal powder by utilizing microalgae

Abstract

The invention discloses apparatus and a process for treating breeding wastewater in a pig farm and producing algal powder by utilizing microalgae. The device comprises a wastewater pool, a filtering device, a pipeline type photobioreactor, a spraying device, a gas supply device, an ultrafiltration device, a centrifuge and a clear water pool; and the process comprises the following steps: (1) performing secondary pretreatment on the breeding wastewater in the pig farm, placing the treated wastewater into the photobioreactor, and performing treatment by using a disinfection sterilization system;(2) performing inoculation in the photobioreactor having the wastewater in the pig farm by using the microalgae, performing cultivation, and performing harvesting, wherein the photobioreactor includes an on-line detection water datum system: an in-situ carbon supplementation-pH feedback control device, a spray automatic cooling system and a dissolved-oxygen detection system; and (3) performing centrifugation on the harvested algal liquid to obtain algal mud, and performing drying to obtain the algal powder. The method provided by the invention eliminates or reduces discharge of waste to a maximum limit, achieves the purposes of energy conservation, emission reduction, efficiency enhancement and resource recovery, is applied to large-scale purification treatment of the wastewater in the pig farm and production of the algal powder, and realizes sustainable development and utilization of resources.

Description

technical field [0001] The invention relates to a pig farm wastewater treatment device and a process method thereof, belonging to the technical field of sewage treatment, and in particular to an integrated technical system for treating and purifying pig farm wastewater and producing algae powder using microalgae. Background technique [0002] In recent years, my country's livestock and poultry breeding industry has continued to develop, the discharge of breeding wastewater has also increased year by year, and the pressure on environmental pollution prevention and control has continued to increase. In 2015, the number of pigs slaughtered in my country reached 708 million, and the discharge of pig raising wastewater was as high as 1 million to 1.5 million tons per day. Aquaculture pollution has become the largest source of pollution after industrial pollution and domestic pollution. [0003] At present, domestic large-scale pig farms are equipped with anaerobic fermentation t...

AI Technical Summary

Problems solved by technology

However, the fermentation period is too long, the floor area is large, the biogas generated is unstable, the sludge at the bottom of the fermentation tank cannot be recovered, and the nitrogen and phosphorus content in the biogas slurry after fermentation is high, which is difficult to meet the national emission standards. sewage

Pig farming wastewater contains N, P, Mg, Zn, Ca and other elements, and direct discharge without utilization will waste resources and increase environmental pressure

Images